Polymers

Question 0

Give an example of semi synthetic polymer

Answer 0

Cellulose acetate(RAYON)

Question 1

How are monomers linked to each other?

Answer 1

By covalent bonds

Question 2

What is the structure of high density polythene?

Answer 2

Linear

Question 3

Low density polythene is classified as

Answer 3

Branched chain polymer

Question 4

How are network polymers formed?

Answer 4

Formation of strong covalent bonds between linear polymers

Question 5

Dacron is a condensation polymer which is also known as

Answer 5

Terylene

Question 6

How are polymers classified on the basis of molecular forces

Answer 6

1. Elastomers
2. Fibres
3. Thermosetting polymers
4. Thermoplastic polymers

Question 7

Elastomers are held together by…..

Example: neoprene ,Buna S ,Buna N

Answer 7

Weak Vanderwaal forces

Question 8

Vulcanised rubber with 25% S is c’d

Answer 8

Ebonite

Question 9

Fibres r held together by…..

Eg:- polyamides and polyesters

Answer 9

H-bonding

Question 10

Thermoplastics are..?

Answer 10

Polythene, PVC, polystyrene

Become soft on heating and hard on cooling.

Question 11

Formaldehyde resins and Bakelite are examples of…

Answer 11

Thermosetting polymers

On heating form cross link and become infusible on cooling

Question 12

Addition polymerisation is also c’d

Answer 12

Chain growth polymerisation

Condensation= step growth polymerisation

Question 13

What is the most common mode of addition polymerisation?

Answer 13

Free radical mechanism

Question 14

Initiator used in prep of polythene is

Answer 14

Benzoyl peroxide

Question 15

Conditions for manufacture of low density polythene

Answer 15

P= 1000-2000atm
T=350-570K

Peroxide catalyst

Question 16

Conditions for high density polythene

Answer 16

Hydrocarbon solvent
T=333-343K
P=6-7 atm

Question 17

Catalyst used in manufacturing of HDP

Answer 17

Ziegler natta catalyst (TiCl4)

Triethylaluminium

Question 18

Monomer of Teflon is-

Answer 18

Tetrafluoroethene

Question 19

Catalyst used in manufacturing of Teflon is

Answer 19

Persulphate catalyst

(NH4)2S2O8

Question 20

Wool is substituted by

Answer 20

Acrilan or orlan made of PAN

Question 21

What r the monomers of Dacron?

Answer 21

Ethylene glycol & terephthallic acid

Question 22

Monomer of Nylon6 is

Answer 22

Caprolactam

Question 23

Polyesters are polycondensation products of..

Answer 23

Dicarboxylic acids and diols

Question 24

Catalyst used in manufacturing Dacron

Answer 24

Zinc acetate-antimony

Question 25

Oldest synthetic polymers are

Answer 25

Phenol formaldehyde polymers

Question 26

What is the initial product of condensation reaction of phenol & formaldehyde

Answer 26

Novolac

Question 27

The infusible solid mass formed after heating Novolac with formaldehyde is called..

Answer 27

Bakelite

Question 28

Unbreakable crockery is made of

Answer 28

Melamine

Question 29

Buna S is a substitute for

Answer 29

Natural rubber

Question 30

What is rubber latex?

Answer 30

Colloidal dispersion of rubber in water

Question 31

Natural rubber is the polymer of

Answer 31

Isoprene (2-methyl1,3-butadiene) Also called cis-1,4-poly isoprene

Question 32

Monomer of PHBV

Answer 32

3-hydroxybutanoic acid | 3-hydroxypentanoic acid

Question 33

Nylon2,6 is polymer of

Answer 33

Glycine & amino caproic acid

Question 34

Glyptal is polymer of?

Answer 34

Ethylene glycol & phthallic acid

Question 35

Monomers of nylon 6,10

Answer 35

Hexamethylene diamine & sebasic acid

Question 36

Monomer of polyurethane

Answer 36

Ethylene glycol & toluene-m-cyanate

Question 37

Monomer of starch ?

Answer 37

a-D-glucose It is also the monomer of glycogen

Question 38

Monomer of cellulose

Answer 38

B-D-glucose

Question 39

Neoprene is polymer of

Answer 39

Chloroprene (2-chloro-1,3-butadiene)

Question 40

Acrilan is

Answer 40

PAN

Question 41

During polymerisation nylon 66 is obtained in which form

Answer 41

Liquid state

Question 42

Vulcanised rubber is

Answer 42

Low water absorbing Resistant to oxidation Good elasticity

Question 43

Plexiglass is commercial name for

Answer 43

Poly methyl methacrylate(PMMA)

Question 44

Polymer used in making bulletproof glass is

Answer 44

Lexan

Question 45

Rubber used for manufacturing tyres is vulcanised with

Answer 45

3-10% S | (5%) ncert

Question 46

Petrol hoses are made of

Answer 46

Buna N

Question 47

Monomer of polyvinyl polythene is

Answer 47

1,3-butadiene

Question 48

Polymer used in orthopaedic devices and sustained drug release is

Answer 48

PHBV