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Intro To Polymer 1 > Exam 2 > Flashcards

Exam 2 Flashcards

1
Q

What are the 3 main processes of radical chain growth?

A

Initiation, propagation, and termination

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2
Q

What is kintetics?

A

The rate of chemical reactions.

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3
Q

What are the 4 polymer reaction systems?

A

Bulk, solution, suspension, and emulsion

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4
Q

What is 1 pro and 1 con of Bulk polymerization?

A

Pro: High Yield
Con: difficult to stir

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5
Q

What is 1 pro and 1 con of Solution polymerization?

A

Pro: product easily removed
Con: small yield

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6
Q

What is 1 pro and 1 con of suspension polymerization?

A

Pro: High purity
Con: small yield

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7
Q

What is 1 pro and 1 con of Emulsion Polymerization?

A

Pro: low viscosity
Con: separation is difficult

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8
Q

What is degree of polymerization?

A

Average number of repeating units in each chain

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9
Q

What is viscoelasticity?

A

Viscosity: ability to flow
Elasticity: ability to stretch

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10
Q

What are 3 unique properties of polymers?

A

1: chain entanglement
2: summation of intermolecular forces
3: time scale of motion

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11
Q

What is chain entanglement?

A

Entangled chains inside a polymer that once molten allow to slide past on another.

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12
Q

What is summation of intermolecular forces?

A

Polymers are made up of large molecules whos intermolecular forces are compounded due to size

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13
Q

What is time scale of motion?

A

Polymers move slower than small molecules do.

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14
Q

What are 4 molecular structures for polymers?

A

Linear, branched, cross-linked, network

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15
Q

What is a linear molecular structure?

A

Repeat units joined end to end in single chains

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16
Q

What is a branched molecular structure?

A

Side branched chains connected to a main chain

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17
Q

What is a cross-linked molecular structure?

A

Adjacent chains joined at positions by covalent bonding

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18
Q

What is a network molecular structure?

A

Three or more covalent bonds in a small molecule

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19
Q

What is tacticity?

A

The spa jam arrangements of monomeric units along a polymer chain

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20
Q

What are the 3 types of tacticity?

A

Isotactic, syndiotactic, and atactic

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21
Q

What is isotactic?

A

All side groups facing the same way

22
Q

What is syndiotactic?

A

side groups alternate in orientation

23
Q

What is atactic?

A

Side groups oriented in a random manner

24
Q

What is stereoregularity?

A

Configuration of polymer chains

25
Q

What are the 2 types of stereoregularity?

A

Cis and Trans

26
Q

What is Cis stereoregularity?

A

Substitutents on the same side

27
Q

What is Trans stereoregularity?

A

Substitutents on the opposite side

28
Q

What are 3 factors that affect crystalinity?

A

Chain entanglement, chain length, and inter chain bonding

29
Q

What are 3 high crystalline polymers?

A

Polyethylene, polypropylene, and PET

30
Q

What are 3 high amorphous polymers?

A

Polystyrene, PMMA, and PVC

31
Q

What is a Thermoset?

A

Network structures that can’t be re-molded once set.
Typically stronger than thermoplastic

32
Q

3 examples of thermosets

A

Epoxy resin, polyurethane, and Bakelite

33
Q

What is a Thermoplastic?

A

Linear polymers with minor branching and flexible chains

34
Q

3 examples of thermoplastics

A

PE, PVC, and PP

35
Q

Are elastomers thermosets or thermoplastics?

A

They can be either, as well as a rubber

36
Q

What is glass transition temperature?

A

Temperature AMORPHOUS polymers transition from rubbery solid to brittle, glassy amorphous solid.

37
Q

What is vitrification?

A

when an amorphous solid transitions to a glassy solid

38
Q

What is polydispersity?

A

Polydispersity refers to the distribution of molecular weight

39
Q

What instrument can you use to determine polydispersity?

A

Size Exclusion Chromatography (SEC)
Gel Permeation Chromatography (GPC)

40
Q

What are 4 common spectroscopic techniques?

A

FTIE, RAMEN, NMR, SAX/WAX

41
Q

What does FTIR and RAMEN identify?

A

Functional Groups

42
Q

What does NMR identify?

A

Microstructure

43
Q

What does SAX/WAX Identify?

A

Arrangement of atoms or molecules in a material

44
Q

What are 3 Thermal Analyses?

A

TGA, DSC. DMA

45
Q

What are 3 Mechanical analyses?

A

DMA, MTS, and Rheology

46
Q

What is rheology?

A

Study of deformation and flow of matter

47
Q

What are 3 things TGA measures?

A

Degradation temp, thermal stability, Oxidative Stability

48
Q

What does DSC measure?

A

Exothermic and Endothermic transitions

49
Q

What does DMA measure?

A

Thermomechanical behavior

50
Q

What does MTS measure?

A

Physical Properties and tinsile strength

51
Q

What does rheology measure?

A

Flow or movement of liquids and solids

Intro To Polymer 1 (1 decks)

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