Ch. 14 Polymer Structures

Question 1

General Properties of Plastics

Answer 1

Low density, ez molding, low cost, noise reducing, corrosion resistant, low friction, insulating

Question 2

Old Polymers

Answer 2

Wood, rubber, cotton, wool, leather, silk

Question 3

Mers

Answer 3

Basic polymer unit

Question 4

Isomerism

Answer 4

2 compounds w same formula can look different

Question 5

Common Hydrocarbons

Answer 5

Alcohols, Ethers, Acids, Aldehydes, Aromatics

Question 6

Alcohol

Answer 6

R - OH

Question 7

Ethers

Answer 7

R - O - R’

Question 8

Acids

Answer 8

R - C - OH and C = O

Question 9

Aldehydes

Answer 9

R - C - H and C = O

Question 10

Aromatics

Answer 10

Benzene ring and R

Question 11

Bulk Polymers

Answer 11

Polyethelene, PVC, PTEE, Polypropylene, Polystytrine, PMAA, Bakelite, Nylon, PET, PC,

Question 12

Molecular weight methods

Answer 12

No. Avg. Molecular weight, Weight Avg. Molecular weight

Question 13

No. Avg. Molecular Weight Formula (Mn)

Answer 13

Sum of Number fraction of chains * Mean molecular weight

Question 14

Weight Avg. Molecular Weight Formula (Mw)

Answer 14

Sum of weight fraction of chains * Mean moleculat weight

Question 15

Degree of Polymerization

Answer 15

DP = Mn / m (mer molecular weight)

Question 16

Double bonds restrict…

Answer 16

rotation

Question 17

Bulky side groups…

Answer 17

hinder rotation

Question 18

Molecular structure types (from least to most strong)

Answer 18

Linear, Branched, Crosslined, Network

Question 19

Stereoisomerism

Answer 19

Stereo Regularity of chain

Question 20

Isotactic

Answer 20

One sided groups

Question 21

Syndiotactic

Answer 21

Alternating sided groups

Question 22

Atactic

Answer 22

Random sided groups

Question 23

Thermoplastic

Answer 23

Plastc when heated, long chains w HON side groups

Question 24

Thermoset

Answer 24

Plastic until set by chem reaction,rigid network

Question 25

Homopolymers

Answer 25

Polymers of only 1 mer

Question 26

Copolymers

Answer 26

Polymers of 1+ mer

Question 27

Types of copolymers

Answer 27

Random, alernating, block, graft

Question 28

Crystal structure of thermoplastics

Answer 28

Chain folded struct.

Question 29

% Crystallinity is proportional to

Answer 29

E, TS, Annealing

Question 30

Spherulites

Answer 30

Layered struct of natural rubber

Question 31

% Crystallinity (measure)

Answer 31

= Pc ( Ps - Pa ) / Ps ( Pc - Pa ) * 100

Question 32

Crystallinity depends on

Answer 32

Cooling rate, chain config.