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Chemistry > Polymers > Flashcards

Polymers Flashcards

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0
Q

Give an example of semi synthetic polymer

A

Cellulose acetate(RAYON)

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1
Q

How are monomers linked to each other?

A

By covalent bonds

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2
Q

What is the structure of high density polythene?

A

Linear

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3
Q

Low density polythene is classified as

A

Branched chain polymer

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4
Q

How are network polymers formed?

A

Formation of strong covalent bonds between linear polymers

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5
Q

Dacron is a condensation polymer which is also known as

A

Terylene

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6
Q

How are polymers classified on the basis of molecular forces

A
  1. Elastomers
  2. Fibres
  3. Thermosetting polymers
  4. Thermoplastic polymers
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7
Q

Elastomers are held together by…..

Example: neoprene ,Buna S ,Buna N

A

Weak Vanderwaal forces

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8
Q

Vulcanised rubber with 25% S is c’d

A

Ebonite

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9
Q

Fibres r held together by…..

Eg:- polyamides and polyesters

A

H-bonding

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10
Q

Thermoplastics are..?

A

Polythene, PVC, polystyrene

Become soft on heating and hard on cooling.

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11
Q

Formaldehyde resins and Bakelite are examples of…

A

Thermosetting polymers

On heating form cross link and become infusible on cooling

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12
Q

Addition polymerisation is also c’d

A

Chain growth polymerisation

Condensation= step growth polymerisation

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13
Q

What is the most common mode of addition polymerisation?

A

Free radical mechanism

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14
Q

Initiator used in prep of polythene is

A

Benzoyl peroxide

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15
Q

Conditions for manufacture of low density polythene

A

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

Peroxide catalyst

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16
Q

Conditions for high density polythene

A

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

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17
Q

Catalyst used in manufacturing of HDP

A

Ziegler natta catalyst (TiCl4)

Triethylaluminium

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18
Q

Monomer of Teflon is-

A

Tetrafluoroethene

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19
Q

Catalyst used in manufacturing of Teflon is

A

Persulphate catalyst

(NH4)2S2O8

20
Q

Wool is substituted by

A

Acrilan or orlan made of PAN

21
Q

What r the monomers of Dacron?

A

Ethylene glycol & terephthallic acid

22
Q

Monomer of Nylon6 is

A

Caprolactam

23
Q

Polyesters are polycondensation products of..

A

Dicarboxylic acids and diols

24
Q

Catalyst used in manufacturing Dacron

A

Zinc acetate-antimony

25
Q

Oldest synthetic polymers are

A

Phenol formaldehyde polymers

26
Q

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

A

Novolac

27
Q

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

A

Bakelite

28
Q

Unbreakable crockery is made of

A

Melamine

29
Q

Buna S is a substitute for

A

Natural rubber

30
Q

What is rubber latex?

A

Colloidal dispersion of rubber in water

31
Q

Natural rubber is the polymer of

A

Isoprene (2-methyl1,3-butadiene)

Also called cis-1,4-poly isoprene

32
Q

Monomer of PHBV

A

3-hydroxybutanoic acid

3-hydroxypentanoic acid

33
Q

Nylon2,6 is polymer of

A

Glycine & amino caproic acid

34
Q

Glyptal is polymer of?

A

Ethylene glycol & phthallic acid

35
Q

Monomers of nylon 6,10

A

Hexamethylene diamine & sebasic acid

36
Q

Monomer of polyurethane

A

Ethylene glycol & toluene-m-cyanate

37
Q

Monomer of starch ?

A

a-D-glucose

It is also the monomer of glycogen

38
Q

Monomer of cellulose

A

B-D-glucose

39
Q

Neoprene is polymer of

A

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

40
Q

Acrilan is

A

PAN

41
Q

During polymerisation nylon 66 is obtained in which form

A

Liquid state

42
Q

Vulcanised rubber is

A

Low water absorbing
Resistant to oxidation
Good elasticity

43
Q

Plexiglass is commercial name for

A

Poly methyl methacrylate(PMMA)

44
Q

Polymer used in making bulletproof glass is

A

Lexan

45
Q

Rubber used for manufacturing tyres is vulcanised with

A

3-10% S

(5%) ncert

46
Q

Petrol hoses are made of

A

Buna N

47
Q

Monomer of polyvinyl polythene is

A

1,3-butadiene

48
Q

Polymer used in orthopaedic devices and sustained drug release is

A

PHBV

Chemistry (3 decks)

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