polymers 2

Question 1

what does degree of crystallinity range from

Answer 1

0% to 90%

Question 2

what does degree of crystallinity depend on

Answer 2

chemical structure
temperature
molecular weight
processing conditions

Question 3

what type of polymer is an exception to the <90% rule

Answer 3

biopolymers can be completely crystalised

Question 4

what are the three physical states or amorphous polymers

Answer 4

glassy state
rubbery state
liquid state

Question 5

What are Tg polymers

Answer 5

hard and glassy

Question 6

what are above tg polymers

Answer 6

soft and eleastic

Question 7

is the tg value always the same

Answer 7

Tg values of different polymers is different

Question 8

can tg be altered

Answer 8

yes when mixed with something e.g. drugs

Question 9

what is addition polymerisation

Answer 9

is when monomer with double bonds break and form a macromolecule chain

Question 10

what is step growth polymerisation

Answer 10

Step-growth polymerization refers to a type of polymerization mechanism in which bi-functional or multifunctional monomers react to form first dimers, then trimers, longer oligomers and eventually long chain polymers

Question 11

what is ring opening polymerisation

Answer 11

ring breaks and forms into macromolecules

Question 12

what is one example of modification of polymers

Answer 12

deacetylation of chitin