POLYMERS

1.Define with example:

(i)         Polymerisation

(ii)        Co- polymerization

(iii)       Biodegradable polymer

(iv)       Cross-linked Polymer

2.What are

          a) natural polymers

          b) semi synthetic polymers

c) synthetic polymers

d) homo polymers and co polymers

e) poly esters

f) poly amides?

            Give two examples each.

3.How does the presence of double bond influence the structure and               reactivity of rubber?

4. Is ( NH-CH-CO)   n homo polymer or co polymer?

5. Identify the monomer present in the polymer                                                 (CO- (CH2)6-NH- (CH2)6-NH-)n

6. Write down the differences between the following pairs:

(i)   Natural & Synthetic Polymer

(ii)  Addition & Condensation polymer

(iii)  Thermoplastic & Thermosetting plastic

(iv)  Step growth polymerization & Chain growth Polymerisation

(v)   Nylon 6 and Nylon 66

(vi)  Novolac and Bakelite

(vii) Buna-S and Buna-N rubber.

7. Arrange the following polymers according to their increasing tensile              strength:

a) Buna N, PVC, Nylon 6

b) Terylene, neoprene, Polystyrene

8. Arrange the following in the increasing order of molecular forces:

Nylon 66 ,  polythene,  Buna-S-rubber

9. Give reason why:

a) Vulcanised rubber is used as a car tyre.

b) Neoprene rubber is used in water-hoses of fire fighting device.

10. How are polymers classified on the basis of their structure? Give 2             examples each.

11. What do you mean by addition and condensation polymers? Give 2           examples each.

12. What are biodegradable polymers? Give an example of biodegradable

a) polyester

b) poly amide.

13. How is

a) Low density polythene

b) High density polythene prepared?

Mention their properties and give two uses of each.

14. Give the mechanism of chain growth Polymerisation of polythene.

15   i) Name and give the structures of monomers of

a) polythene             b) poly propene

c) PVC                    d) Poly acrylo nitrile

e) Teflon                  f) Dacron ( Terelene)

g) Glyptal                h) Nylon 6

i) Bakelite                j) Nylon 6-6

k) Poly styrene       l) Natural rubber

m) Neoprene          n) Buna-N rubber

o) Buna-S-rubber  p) Novolac

q) Melamine           r) PHBV

s) Nylon-2-nylon 6

ii) Give two uses of the above mentioned polymers.

16.   I ) Write the equation of the reaction involved in the preparation of

a) polythene                                  b) poly propene

c) PVC                                           d) Poly acrylo nitrile

e) Teflon                                         f) Dacron ( Terelene)

g) Glyptal                                       h) Nylon 6

i) Bakelite                                        j) Nylon 66

k) Poly styrene                               l) Natural rubber

m) Neoprene                                   n) Buna-N rubber

o) Buna-S-rubber                           p) Novolac

q) Nylon-2 Nylon-6                         r) PHBV

s) Melamine formaldehyde resin.   t) natural rubber

       II) Classify them as

i) addition or condensation polymer

ii) homo polymer or co polymer.

III) Give two uses of each.

17. What do you mean by vulcanization of natural rubber? What is the purpose of vulcanization?