Polymer Flashcards
Chemical Name of Kevlar
Poly (P-phynylene terephtalamide)
Kevlar is a type of:
a) Thermoplastic polymer
b) Thermosetting polymer
c) Aromatic polyamide (aramid)
d) Natural polymer
Aromatic polyamide (aramid)
Which property makes Kevlar suitable for bulletproof vests?
a) High density
b) High tensile strength
c) Low thermal resistance
d) Flexibility
High tensile strength
Kevlar is primarily synthesized from which of the following monomers?
a) Ethylene glycol and terephthalic acid
b) Hexamethylene diamine and adipic acid
c) Paraphenylene diamine and terephthaloyl chloride
d) Butadiene and styrene
Paraphenylene diamine and terephthaloyl chloride
Which of the following is a key application of Kevlar?
a) Packaging materials
b) Optical fibers
c) Parachutes
d) Reinforcement in composite materials
Reinforcement in composite materials
ABS is widely used for:
a) Electrical insulation
b) Food packaging
c) Automotive parts
d) Thermal insulation
Automotive parts
ABS polymer is a copolymer made from which three monomers?
a) Acrylonitrile, styrene, and butadiene
b) Styrene, ethylene, and propylene
c) Vinyl chloride, acrylonitrile, and butadiene
d) Butadiene, polypropylene, and styrene
Acrylonitrile, styrene, and butadiene
ABS is classified as:
a) Thermosetting polymer
b) Thermoplastic polymer
c) Elastomer
d) Biodegradable polymer
Thermoplastic polymer
Electroluminescent polymers emit light when:
a) Heated to high temperatures
b) Exposed to mechanical stress
c) An electric current is applied
d) Subjected to ultraviolet radiation
An electric current is applied
Which of the following polymers is commonly used in organic light-emitting diodes (OLEDs)?
a) Polythiophene (PT)
b) Polyacetylene
c) Poly(p-phenylene vinylene) (PPV)
d) Polytetrafluoroethylene (PTFE)
Poly(p-phenylene vinylene) (PPV)
Electroluminescent polymers are primarily used in which of the following applications?
a) Optical fibers
b) Photovoltaic cells
c) Display technology
d) Packaging materials
Display technology
Which of the following is a property of electroluminescent polymers?
a) They are biodegradable.
b) They can conduct heat but not electricity.
c) They emit light upon electric stimulation.
d) They have low mechanical strength.
They emit light upon electric stimulation.
Which of the following is an example of a conductive polymer?
a) Polyvinyl chloride (PVC)
b) Polyaniline (PAN)
c) Nylon
d) Polyethylene terephthalate (PET)
Polyaniline (PAN)
The conductivity of a conductive polymer is significantly enhanced through:
a) Heating
b) Compression
c) Doping
d) Oxidation
Doping
Which of the following is an example of a thermo-responsive smart polymer?
a) Poly(N-isopropylacrylamide) (PNIPAM)
b) Polystyrene
c) Polyethylene
d) Polyvinyl chloride
Poly(N-isopropylacrylamide) (PNIPAM)
Kevlar is resistant to:
a) Organic solvents
b) UV degradation
c) High temperatures
d) Both c) and a)
Both c) and a)
What is the main disadvantage of Kevlar when exposed to moisture?
a) It melts
b) It swells
c) It loses strength
d) It dissolves
It loses strength
Which of the following materials has a higher tensile strength than Kevlar?
a) Steel
b) Carbon fiber
c) Aluminum
d) Glass
Carbon fiber
The chemical structure of Kevlar consists of which types of bonds?
a) Hydrogen bonds and ionic bonds
b) Van der Waals forces
c) Strong hydrogen bonds and aromatic rings
d) Covalent bonds only
Strong hydrogen bonds and aromatic rings
In addition to bulletproof vests, Kevlar is used in which of the following protective gear?
a) Surgical gloves
b) Safety helmets
c) Diving suits
d) Ski goggles
Safety helmets
Which of the following is a primary use of Kevlar in the automotive industry?
a) Fuel lines
b) Tire reinforcement
c) Headlight covers
d) Battery casings
Tire reinforcement
Kevlar fibers are typically produced by which process?
a) Blow molding
b) Spinning
c) Injection molding
d) Casting
Spinning
Kevlar was first developed by which company?
a) 3M
b) DuPont
c) BASF
d) Dow Chemical
DuPont
What happens to Kevlar when it is heated to very high temperatures?
a) It melts
b) It burns slowly
c) It decomposes without melting
d) It evaporates
It decomposes without melting
Which property of ABS makes it useful in injection molding?
a) High melting point
b) Low cost of production
c) Good dimensional stability and machinability
d) High transparency
Good dimensional stability and machinability
ABS is widely used in the manufacture of:
a) Medical implants
b) Construction bricks (e.g., LEGO)
c) Packaging materials
d) Conductive wires
Construction bricks (e.g., LEGO)
Which characteristic of ABS makes it ideal for automotive applications?
a) High impact resistance
b) UV resistance
c) High thermal conductivity
d) Biodegradability
High impact resistance
What happens when ABS is exposed to UV light over time?
a) It becomes stronger
b) It becomes brittle and discolors
c) It melts
d) It evaporates
It becomes brittle and discolors
Which of the following processes is commonly used to shape ABS?
a) Blow molding
b) Extrusion
c) Rotational molding
d) Injection molding
Injection molding
ABS is frequently used in the manufacturing of which household product?
a) Kitchen utensils
b) Laptop casings
c) Ceramic tiles
d) Light bulbs
Laptop casings
The butadiene component in ABS contributes to its:
a) Flexibility and toughness
b) Heat resistance
c) Chemical stability
d) Transparency
Flexibility and toughness
What is the glass transition temperature (Tg) of ABS?
a) -40°C
b) 100°C
c) 105°C
d) 200°C
105°C
Which of the following properties is NOT a characteristic of ABS?
a) High impact strength
b) Electrical conductivity
c) Good surface finish
d) High dimensional stability
Electrical conductivity
In 3D printing, ABS is commonly used due to its:
a) Low melting point
b) High impact resistance and ease of shaping
c) Ability to conduct electricity
d) Transparent finish
High impact resistance and ease of shaping
Which of the following is a disadvantage of using ABS?
a) High density
b) Poor resistance to sunlight (UV)
c) Low thermal expansion
d) High cost
Poor resistance to sunlight (UV)
The acrylonitrile component of ABS provides:
a) Flexibility and toughness
b) Hardness and chemical resistance
c) Transparency
d) Heat insulation
Hardness and chemical resistance
ABS can be recycled. True or false?
a) True
b) False
True
ABS has poor resistance to which of the following substances?
a) Acids
b) Alkalis
c) UV radiation
d) Solvents
UV radiation
The styrene component in ABS adds:
a) Durability and high tensile strength
b) Glossy finish and processability
c) Flexibility and impact resistance
d) UV resistance
Glossy finish and processability
Which of the following chemical constituents in ABS is responsible for providing hardness and resistance to chemical corrosion?
a) Styrene
b) Butadiene
c) Acrylonitrile
d) Propylene
Acrylonitrile
Which of the following structural characteristics applies to ABS?
a) Cross-linked polymer chains
b) Random copolymerization of its monomers
c) Linear polymer with alternating monomer units
d) Semi-crystalline structure
Random copolymerization of its monomers
In the production of ABS, the butadiene component primarily contributes to:
a) High temperature resistance
b) Elasticity and toughness
c) Color stability
d) Solubility in water
Elasticity and toughness
Which chemical constituent of ABS is susceptible to degradation when exposed to UV light?
a) Butadiene
b) Styrene
c) Acrylonitrile
d) All of the above
Styrene
The repeating units in Kevlar contain which functional groups?
a) Amide groups (-CONH-)
b) Ether groups (-O-)
c) Ester groups (-COO-)
d) Hydroxyl groups (-OH-)
Amide groups (-CONH-)
The strong hydrogen bonding between Kevlar polymer chains results in:
a) Low tensile strength
b) High melting point and rigidity
c) High elasticity
d) Soft texture
High melting point and rigidity
Kevlar decomposes at temperatures above:
a) 200°C
b) 300°C
c) 400°C
d) 500°C
400°C
Which structural feature of Kevlar gives it high tensile strength?
a) Crystalline arrangement of polymer chains
b) Flexible polymer chains
c) Low molecular weight
d) Random arrangement of polymer chains
Crystalline arrangement of polymer chains
What about Kevlar makes it so strong?
A. Kevlar is made with spider silk, a naturally strong material.
B. The molecules stack together in crystal-like structures.
C. The molecules are short and create density
D. The molecules in Kevlar form a cylindrical-like structure.
The molecules stack together in crystal-like structures.
The key molecular interaction that contributes to the exceptional mechanical properties of Kevlar is:
a) Strong covalent bonds within the polymer chains and hydrogen bonds between them
b) Weak Van der Waals forces
c) Ionic bonding between polymer chains
d) Covalent bonds between polymer chains
Strong covalent bonds within the polymer chains and hydrogen bonds between them
Who developed Kevlar?
Stephanie Kwolek
In which year was Kevlar developed?
1965
Which company developed Kevlar?
DuPont
What is the chemical name of Kevlar?
Poly Para Phynylene terephthalamide
Kevlar belongs to which family of fibers?
Aramid (aromatic polyamide)
What type of polymerization is used to produce Kevlar?
Condensation polymerization
Which two chemicals are polymerized to form Kevlar?
p-phenylene diamine (PPD) and terephthaloyl chloride (TCl)
What is the byproduct of Kevlar’s polymerization process?
HCl (Hydrochloric acid)
At what temperature does Kevlar decompose?
450°C
Kevlar belongs to which family of fibers?
a) Polyester
b) Nylon
c) Aramid
d) Polyurethane
Aramid
Which mechanical property does Kevlar have poor performance in?
a) Tensile strength
b) Flexibility
c) Compressive strength
d) Thermal stability
Compressive strength
Which variant of Kevlar is used primarily in ballistic protection?
a) Kevlar 29
b) Kevlar 49
c) Kevlar 149
d) Kevlar 39
Kevlar 29
Which variant of Kevlar has high stiffness and is used in aerospace composites?
a) Kevlar 29
b) Kevlar 49
c) Kevlar 149
d) Kevlar 69
Kevlar 49
Which type of Kevlar provides the highest tensile strength and modulus?
a) Kevlar 29
b) Kevlar 49
c) Kevlar 149
d) Kevlar 89
Kevlar 149
What is one of the primary applications of Kevlar in the military?
a) Tanks
b) Ballistic protection
c) Helicopters
d) Radio systems
Ballistic protection
Which component in automobiles commonly uses Kevlar for durability?
a) Tires
b) Windows
c) Steering wheels
d) Brake pads
Brake pads
Kevlar is used in the aerospace industry to reinforce which components?
a) Fuselages
b) Landing gear
c) Windshields
d) Wheels
Fuselages
What sporting equipment often uses Kevlar?
a) Tennis rackets
b) Golf balls
c) Bicycle tires
d) Football helmets
Bicycle tires
In construction, what is Kevlar used for?
a) Roof tiles
b) Reinforced concrete
c) Flooring materials
d) Paint coatings
Reinforced concrete
Kevlar is used in gloves for protection against what?
a) Heat
b) Cuts and abrasions
c) Electricity
d) Water
Cuts and abrasions
Which bond is formed between the amide groups in Kevlar?
a) Ionic bond
b) Hydrogen bond
c) CO-NH bond
d) Covalent bond
CO-NH bond
What group is attached to the benzene ring in p-phenylene diamine?
a) COOH group
b) OH group
c) NH2 group
d) CH3 group
NH2 group
