rubber

Question 1

example of natural polymer

Answer 1

polyisoprene
starch
cellulose
protein
gelatine(collagen)

Question 2

3 types of rubber

Answer 2

thermoplastic
thermoset
elastomer

Question 3

2 example each

Answer 3

polyethene nylon pvc
bakelite silicone epoxy
SBR/silicone elastomers

Question 4

characteristic

Answer 4

can be recycled
cannot be recycled
strong elasticity

Question 5

three alternatives vulcanisation

Answer 5

metal oxide
peroxide
irradiation