Lecture 2 & 3

Question 1

functionality has to do with

Answer 1

how many bonds can form off of a single monomer

Question 2

rubber____ in heat due to entropy

Answer 2

shrinks

Question 3

what is an exception to head to tail isomerism

Answer 3

polyethylene, it has no R groups

Question 4

most well known head to tail isomerism

Answer 4

PVC

Question 5

there is a higher fraction of head to head configurations at higher _______

Answer 5

temperatures

Question 6

isotactic

Answer 6

same, organized and can crystallize, stereoregular

Question 7

syndiotactic

Answer 7

switch, organized and can crystallize, stereoregular

Question 8

atactic

Answer 8

random, can’t crystalize

Question 9

cis isomerism

Answer 9

ex: H atom and CH3 group on same side of chain

Question 10

trans isomerism

Answer 10

ex: H atoms and group on opposite sides of chain

Question 11

DP

Answer 11

avg. number of polymer units per chain
= Mn/m

Question 12

PDI (polydispersity index)

Answer 12

proportional to width of MW distribution
the higher it is, the wider the distribution
=Mw/Mn

Question 13

Addition polymers

Answer 13

polymer has the same atoms as the monomer in its repeating unit

Question 14

condensation polymers

Answer 14

polymer has fewer atoms than the monomer due to the formation of byproducts

Question 15

Step-growth polymerization

Answer 15

polymer chains built by a stepwise manner

Question 16

chain-growth polymerization

Answer 16

monomer molecules successively link to end of a growing polymer chain

Question 17

the minimum functionality for step growth is

Answer 17

2