Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Track Spec 2 (Polymer Engineering) > Lesson 1, 2: History, Molecular Origin > Flashcards

Lesson 1, 2: History, Molecular Origin Flashcards

1
Q

Macromolecule (long molecules) built of small covalently bonded units called monomers

A

Polymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Monomers in greek word is ___ means ____

A

“mer”, part

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Small units repeated throughout the macromolecule chain

A

Monomers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The macromolecules are bonded together by ___ or ___

A

weak Van der Waals and hydrogen (secondary bonds), or additional covalent cross-links

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Most polymers are ___ and formed from ___

A

Organic, hydrocarbon molecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Each C atoms has ___ electrons that participate in covalent bonding, each H has ___ bonding electron

A

4, 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A single covalent bond exists when ____

A

Each of the 2 bonding atoms contribute one electron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Double and triple bonds between 2 carbon atoms

A

Involve the sharing of 2 and 3 pairs of electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Molecules that have double, and triple covalent bonds are termed

A

Unsaturated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Unsaturated means

A

Each carbon us not bonded to maximum (4) other atoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

For saturated hydrocarbon

A

All bonds are single ones, and no new atoms may be joined w/o the removal of others

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Molecule that combines with other mol of the same/different type to form polymer

A

Monomer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Oligomer is

A

Low molecular weight polymer, contains atleast 2 monomer units

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Oligomer of polyethylene

A

Hexatriacontane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Specifies the length of polymer molecule

A

Degree of polymerization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

In DOP, n means

A

Number of repeating units strung together in the polymer chain (mol)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

A ___ degree of polymerization is normally reqd for a matl to develop useful properties

A

High

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Dimensionless quantity given by the sum of the atomic weights in the mol formula

A

Molecular weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Relation between DOP and MW of the same macromolecule is…

A

M=(DP)Mo

Mo= formula weight of the repeating units

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Classification of Polymers

A

Based on origin
Based on polymer structure
Based on polymerization mechanism
According to thermal processing behavior
Based on preparative technique

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Classification of polymer Based on origin

A

Natural vs synthetic polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Wood, rubber, cotton, leather, wool, silk, protein, enzymes, starches, cellulose is an example of

A

Natural polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Fibers , elastomers, plastics, adhesives

A

Synthetic polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Classification based on polymer structure

A

A. Linear, Branched or cross-linked, network vs functionality
B. AMORPHOUS OR CRYSTALLINE
C. HOMOPOLYMER OR COPOLYMER
D. FIBERS, PLASTICS, OR ELASTOMERS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Interlinking capacity, or the number of sites it has available for bonding with other mol under specific pply conditions

A

Functionality

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

A molecules can be classified as ___, ___, and ___ depending on whether it has one, two, or greater thwn two sites available

A

Monofunctional, bifunctional, and polyfunctional

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Repeat units are joined together end to end in single chains.

A

Linear polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

These long chain are flexible and can be flexible mass spaghetti

A

Linear polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Common examples of LP

A

PE, PVC, PS, and Polyamides

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

___ are generally more rigid

A

Linear polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Branched polymers

A

Have side chains or branches growing out from the main chain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

The side chains or
branches are made of the same repeating units as the
main polymer chains (T or F)

A

T

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

In ___ adjacent linear
chains are joined one to another at
various positions by covalent bonds

A

crosslinked polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

✓Crosslinks tend to be ___ in
nature

A

permanent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

✓Common examples of Cross-linked polymers

A

Bakelite,
melamine, epoxies, bulk molding
compounds, rubber, and various
adhesives

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

✓Multifunctional monomers forming
three or more active covalent bonds
make three dimensional networks
and are termed

A

Network polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

✓These materials have distinctive
mechanical and thermal properties

A

network polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

Network polymers that have distinctive
mechanical and thermal properties

A

epoxies, polyurethanes, and
phenol-formaldehyde

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

material
exhibits organized and tightly packed molecular
chains

A

Crystalline polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

have good strength &
wear, and good chemical resistance, but they typically lack in impact resistance

A

crystalline polymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

✓Examples of crystalline polymers include

A

polyethylene, polyacrylonitrile, poly(ethylene
terephthalate), and polytetrafluoroethylene.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

polymers that have no
crystalline regions and no uniformly packed molecules.

A

✓Amorphous polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

Amorphous polymers are polymers that are
composed of amorphous regions where molecules
are ____ arranged.

A

randomly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

✓Natural rubber latex and styrene-butadiene rubber
(SBR are hood examples of

A

amorphous polymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

✓The ____ is a measure of the degree of order or
orientation in a crystal

A

degree of crystallinity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

The DOC ranges from 0 to 100%, where 0% represents
an ____, and 100% represents a perfectly ____.

A

amorphous material, crystalline
material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

✓When all of the repeating units along a chain are of
the same type, the resulting polymer is

A

Homopolymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

✓The purpose of homopolymers is ____

A

to produce a
polymer that has increased mechanical properties.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

These enhanced mechanical properties in homopolymer include
_____

A

tensile strength, stiffness, impact resistance, and
short-term creep resistance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

✓The types of homopolymers include

A

polyvinyl
chloride, polyethylene, polypropylene,
polycarbonate, polyester, nylon 6, nylon 11,
polytetrafluoroethylene, and styrene.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

A ___ is a polymer made up of more
than one type of monomer unit.

A

copolymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

polymerizing
two or more types of monomer together in
a process

A

Copolymerization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

Copolymers produced in copolymerization are
sometimes also referred to as

A

biopolymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

✓The purpose of creating a copolymer is ____

A

to
manufacture a polymer with more desirable
properties.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

typically experience
a lower crystallinity, higher glass transition temperature, and improved solubility.

A

Copolymers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

In structure of polymers, Representing two different mers by A and B, what is this
ABBABBBAABBAABAAABBA

A

random copolymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

There are three other copolymer structures

A

alternating, block, and graft copolymer structures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

In the ____, the two mers alternate in a regular fashion along the polymer chain
ABABABABABAB

A

alternating copolymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

____ is a linear polymer with one or more long uninterrupted sequences of each mer in the chain -AAAAAAAAAABBBBBBBBBB

A

block copolymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

A ____ is a branched copolymer with a backbone of one type of mer and
one or more side chains of another mer :
AAAAAAAAAA
B
B
B
B

A

graft copolymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

linear polymers with high
symmetry and high intermolecular forces that result usually from the presence of polar groups.

A

Fibers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

characterized by high modulus, high tensile strength, and moderate extensibilities

A

Fibers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

Examples of fibers are

A

Polyester, Nylon, Spandex, Kevlar, Rayon, Acetate, Acrylic, Lastex, Polypropylene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

molecules with irregular structure, weak intermolecular attractive forces, and very flexible polymer chains.

A

Elastomers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

✓____ are polymers that have viscosity and elasticity and therefore are known as ____.

A

Elastomers; viscoelasticity

66
Q

inherit the unique property of
regaining their original shape and
size after being significantly stretched.

A

Elastomers

67
Q

Examples of elastomers

A

rubber, polyurethanes, polybutadiene

68
Q

Examples of elastomers are

A

rubber, polyurethanes, polybutadiene

69
Q

A ____ is a polymer, typically modified with
additives, which can be molded or
shaped under reasonable conditions of pressure and temperature.

A

plastic material

70
Q

7 types of plastics

A

PET, HDPE, LDPE, PVC, PP, PS, Others

71
Q

CLASSIFICATION BASED ON POLYMERIZATION MECHANISM

A

CONDENSATION POLYMERS
ADDITION POLYMERS

72
Q

_____ are formed from a series of reactions, often of condensation type, in which any two species can react at any time leading to a larger molecule.

A

Condensation polymers

73
Q

_____ form of a step-growth
polymerization where smaller
molecules or monomers react with
each other to form larger structural
units (usually polymers) while
releasing by-products such as water or methanol molecule. The by-
products are normally referred to as _______.

A

Condensation polymers; condensate

74
Q

In condensation polymers, the reaction can occur between any two growing polymer molecules and can be represented by

A

P_m + P_n 《》P_(m+n) + W

75
Q

Several _____ include nylon, kevlar, polyester, Bakelite, Melamine, polycarbonates, polyurethanes,
epoxies.

A

synthetic condensation polymers

76
Q

_____ are produced by reactions in which monomers are added one after another to a rapidly growing chain

A

Addition polymers

77
Q

✓Examples of addition polymers are

A

polystyrene, polyethylene,
polyacrylonitrile, polymethyl methacrylate, and polyvinyl chloride.

78
Q

Addition polymers can be schematically represented as

A

P_n + M 《》P_(n+1)

79
Q

CLASSIFICATION OF POLYMERS ACCORDING TO THERMAL PROCESSING BEHAVIOR

A

THERMOPLASTICS
THERMOSETS

80
Q

✓Plastics that soften when heated and
become firm again when cooled. This is
the more popular type of plastic because
the heating and cooling may be repeated and the ___ may be reformed.

A

thermoplastic

81
Q

Most linear polymers and those having some branched structures with flexible chains are ___

A

thermoplastic

82
Q

✓Examples of common _____ include polyethylene, polystyrene, poly(ethylene terephthalate), and poly(vinyl chloride), polypropylene, polycarbonate, nylon, Teflon.

A

thermoplastic polymers

83
Q

These are plastics that soften when heated and can be molded but harden permanently. They will decompose when reheated.

A

THERMOSETS

84
Q

Thermosets usually exist initially as liquids called _____; they can be shaped into desired forms by the application of heat and pressure but are incapable of undergoing repeated cycles of softening and hardening

A

prepolymers

85
Q

Principal examples of thermosets include

A

epoxy, phenol-formaldehyde resins, and unsaturated polyesters.

86
Q

An example of thermoset which is used in toasters, handles for pots and pans, dishes, electrical outlets
and billiard balls.

A

Bakelite

87
Q

A ___ is a polymer that is irreversibly hardened by heat

A

Thermosetting plastic of thermoset

88
Q

✓In _____, only the monomer (and possibly catalyst and initiator, but no solvent) is fed into the reactor. The monomer undergoes polymerization, at the end of which a solid mass is removed as the _____.

A

bulk polymerization; polymer product

89
Q

✓Example of polymers that can be produced by bulk polymerization are

A

polyvinyl chloride (PVC), polyethylene (PE), Polypropylene (PP), Polyethylene terephthalate (PET), Polystyrene (PS), Polyvinylidene chloride (PVDC),
Polytetrafluoroethylene (PTFE).

90
Q

_____ involves polymerization of a
monomer in a solvent in
which both the monomer
(reactant) and polymer
(product) are soluble.

A

Solution polymerization

91
Q

It is used in the production of
polyacrylonitrile, polyacrylic
acid, polyacrylamide,
polyvinyl alcohol,
polybutadiene.

A

Solution polymerization

92
Q

_____ refers to polymerization in an aqueous medium with the monomer as the dispersed phase.
Consequently, the polymer resulting from such a system forms a solid dispersed phase.

A

Suspension polymerization

93
Q

✓Several commercially important vinyl copolymers are manufactured using ____, including polystyrene (general purpose, expandable and
high impact), polymethyl methacrylate, polyvinyl acetate, styrene–acrylonitrile (SAN)
copolymers, acrylonitrile–butadiene–styrene
(ABS) copolymers, and polyvinyl chloride (PVC).

A

suspension polymerization

94
Q

____ is similar to suspension polymerization, but the initiator is located in the aqueous phase (continuous phase) in contrast to the monomer (dispersed phase) in suspension polymerization.

A

Emulsion polymerization

95
Q

BULK PROPERTIES OF POLYMERS

A

TENSILE STRENGTH
YOUNG’S MODULUS OF ELASTICITY
TRANSPORT PROPERTIES
PURE COMPONENT PHASE BEHAVIOR (MELTING POINT, GLASS TRANSITION)

96
Q

The _____ of a material
quantifies how much stress the
material will endure before failing.

A

tensile strength

97
Q

_____ increases with polymer chain length.

A

Tensile strength

98
Q

quantifies the
elasticity of the polymer.

A

Young’s Modulus

99
Q

defined as the ratio of rate of
change of stress to strain

A

Young’s Modulus

100
Q

____ such as diffusivity relate to how rapidly
molecules move through the polymer matrix.

A

Transport properties

101
Q

very important in many applications of polymers for films
and membranes.

A

Transport properties

102
Q

PURE COMPONENT PHASE BEHAVIOR are

A

Melting pt, glass transition

103
Q

The _____ when applied to polymers suggests not a solid-liquid phase transition but a transition from a crystalline or semi-crystalline phase to a solid amorphous phase.

A

melting point

104
Q

___ is a crucial physical
parameter for polymer manufacturing, processing, and use.

A

glass-transition temperature (Tg)

105
Q

Below ____, molecular motions are _____, and polymers are ____.

A

glass-transition temperature (Tg)
frozen
brittle and glassy

106
Q

Above ____, molecular motions are ___, and polymers are _____

A

Tg, activated, rubbery and viscous.

107
Q

A __ is a substance composed of macromolecules.

A

polymer

108
Q

molecule of high relative molecular mass, the structure of which essentially comprises the multiple repetition of units derived, actually or conceptually, from molecules of low relative molecular mass.

A

macromolecules

109
Q

polymer stems from the Greek roots

A

poly (many) and meros (part).

110
Q

Polymer designates a molecule made up by the repetition of some simpler unit called a ___.

A

mer

111
Q

long-chain molecule that is composed of a large number of
repeating units of identical structure.

A

Polymer

112
Q

___ prepared by joining a large number of small molecules called
___.

A

Polymers, monomers

113
Q

Polymer have MW of

A

More than 5000

114
Q

1833 in historical devt of polymers

A

Jons Jacob Berzelius ( poly + meros )

115
Q

1920 in hist devt of polymers

A

Modern definition by Hermann Staudinger IUPAC
definition

116
Q

Year where the Horners Company of London recorded the use of horn and tortoiseshell as the predominant early natural plastic.

A

1284

117
Q

British explorers discovered the Ancient Mayan civilization in
Central America. The Mayans are assumed to be among the first to find an application for polymers, as their children were found playing with balls made from local rubber trees.

A

1500s

118
Q

In ___, _____ (1766-1843) uses rubber gum for making waterproof garments

A

1823, Charles Macintosh

119
Q

In ____, ____ (1795-1871) identified a compound extracted from
wood which he named cellulose.

A

1838, Anselme Payen

120
Q

In ____, ____ (1789- 1856) discovered polystyrene.

A

1839, Eduard Simon

121
Q

In ____, ____ (1800-1860) discovered vulcanization by combining ____ and heating it to ____

A

1839, Charles Goodyear, natural rubber with sulfur, 270°F

122
Q

Goodyear patents the vulcanization of rubber

A

1844

123
Q

In ___, ___ (1799-1868) synthesized nitrocellulose (nitrated cellulose)

A

1846, Christian Friedrich Schonbein

124
Q

In __, ___ (1813-1890) patents the first thermoplastic , _____, made by adding plasticizer to nitrocellulose

A

1856 - Alexander Parkes, (Parkesine)

125
Q

In ____, the Hyatt brothers (John Wesley and Isaiah) in America produced ____ from ___. This was unstable and subsequently led to the development of ___.

A

1868, celluloid, cellulose nitrate mixed with camphor, cellulose acetate

126
Q

In ___, ___ (1846-1896) was the one of the first people to create
polyvinyl chloride (PVC).

A

1872, Eugen Baumann

127
Q

1892, ____ was developed by ___

A

Viscose silk (rayon), Cross and Bevan

128
Q

In ___ , ____ produced phenol-formaldehyde, the first truly synthetic plastic, Bakelite. Cast with pigments to resemble onyx, jade,
marble, and amber, it has come to be known as ____

A

1907, Leo Baekeland, phenolic resin

129
Q

In ___, ____ discovered polyvinyl acetate and patented the
manufacturing process for PVC.

A

1912 - Fritz Klatte

130
Q

_____ discovered how to make sheets and adhesives from poly(vinyl chloride)-and the “vinyl age” began.

A

1926 - B. F. Goodrich

131
Q

In ____, ____, the first transparent sticky tape invented in US by 3M
Company

A

1930 - ‘Scotch’ tape

132
Q

In ____, the first industrially practical ____ synthesis was discovered (again by accident) by _____ at the Imperial Chemical Industries (ICI) works in Northwich, England.

A

1933, polyethylene, Eric Fawcett and Reginald Gibson

133
Q

In 1933, _____ were developed.

A

Melamine formaldehyde resins

134
Q

In ___, Wallace Carothers, working for DuPont invented ____. DuPont named this product ____.

A

1935, polyhexamethylene-
adipamide, nylon

135
Q

Wallace Carothers – Father of ____

A

Synthetic Polymer Science

136
Q

In ____, the Wulff Brothers in Germany produced ____

A

1936, commercially viable polystyrene

137
Q

In ___, ___ patented polyurethane.

A

1937, Otto Bayer

138
Q

In ___, ___ working for DuPont, accidentally discovered _____, tramarked Teflon.

A

1938, Roy Plunkett, polytetra fluroethylene (PTFE)

139
Q

In ____, Polyethylene terephthalate (PET), a saturated polyester patented by ____

A

1941, John Rex Whinfield and James Tennant Dickson.

140
Q

In year ____ - Textiles, Fashion, Toys, Domestic uses (____ first appearance)

A

1950s, polyethylene bag

141
Q

In year ___ – color and design of polymers

A

1960s and 70s

142
Q

In what year the Polyethylene terephthalate beverage bottles introduced

A

1973

143
Q

In year ____ - High performance plastics

A

1980s and 90s

144
Q

In ___ , first ____ was introduced
into UK.

A

1980, Blue HDPE pressure pipes for potable water

145
Q

____ Nanotechnology, Airbus A380, iPod

A

2000 to 2010

146
Q

In ____ , Nanotechnology applied to polymer and composite
applications

A

2000s

147
Q

______ - Scientists at Rice University, Texas have created a new super polymer material that can stop a ___ bullet and seal the hole behind it

A

Bullet Proof Polymer ,9mm

148
Q

Developed by the University of Sheffield to mimic ___, a for use in trauma situations where blood is needed quickly

A

Plastics Blood, haemoglobin

149
Q

A polymer solar cell that can produce electricity from sunlight by the ____ provides a lightweight, disposable and
inexpensive alternative to traditional solar panels

A

Plastic Solar Cells, photovoltaic effect

150
Q

Medical grade and implantable biomaterials such as ____ will be used in neurological applications to help control epilepsy, Parkinson’s disease and brain trauma

A

Implantable Polymers, PEEK

151
Q

Space Flights Lightweight carbon composite materials will be
crucial in the realization of sub- orbital tourist spaceflights.

A

Commercial

152
Q

Body Parts using plastic materials such as PMMA car parts can be printed at home and doctors can produce replica livers or kidneys for transplant patients.

A

3D Printed

153
Q

Organic light-emitting diodes are placed on plastic foil to create electronic devices with flexible displays.

A

Flexible Plastic Screens

154
Q

In the future all driverless vehicles will be almost entirely constructed from plastic parts due to the light weighting properties they provide.

A

Driverless Cars

155
Q

During the height of COVID-19, plastics companies were called upon to deliver over 50,000 bottles of hand sanitizer per week to the NHS

A

COVID-19

156
Q

IMPORTANCE OF POLYMER ENGINEERING IN THE CHEMICAL
ENGINEERING CAREER

A
  1. Select the right material and the production process for an
    application.
  2. Assess product liability.
  3. Develop and automate production techniques.
  4. Design for recyclability.
  5. Solve problems.
  6. Challenge and replace traditional materials.
157
Q

___ was a tragic space shuttle mission occured on ____

A

The Challenger; Jan 28, 1986

158
Q

The Challenger was a tragic space shuttle mission that occurred on
January 28, 1986, during the launch of the ____ at the Kennedy Space Center.

A

Space Shuttle Challenger STS-26

159
Q

The space shuttle disaster, Challenger, was caused by

A

an explosion in one of the O-
ring seals, which allowed hot gas to escape into the external fuel tank and cause an explosion.

160
Q

The Challenger disaster apparently resulted from _____

A

not choosing quite the right rubber seal for the fuel system. The O-ring seal became rigid and lost its resilience/pliability at low temperatures and resulted in fuel seepage. The hot pressurized gas went to the external fuel tank and cause and explosion

161
Q

When considering new materials, assess:

A

Availability
properties
Processability
suitability/functionality, even under extreme conditions
aesthetics and history of the product
environmental impact and health and safety

Track Spec 2 (Polymer Engineering) (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions