Tag: copolymerisation

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Questions Related to copolymerisation

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following represents the example of a homopolymer ?

  1. PMMA

  2. Bakelite
  3. Nylon - $6,\:6$

  4. Neoprene
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

When a polymer is made by linking only one type of small molecule or monomer together, it is called a homopolymer, e.g. PMMA and Neoprene.


When two different types of monomers are joined in the same polymer chain, the polymer is called a co-polymer, e.g., Nylon - $6,:6$ and Bakelite.

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following is a co-polymer ?

  1. Polytetrafluoroethylene

  2. Polyvinyl chloride

  3. Polyethylene
  4. Nylon - $6, \:6$

  5. Natural rubber
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A polymer derived from more than one species of monomer is a co-polymer e.g. Nylon - $6,:6$. 


All others are formed by following single monomers: 
Polytetrafluoroethylene - tetrafluoroethylene, 
Polyvinyl chloride - vinyl chloride, 
Polyethylene - ethylene and
 Natural rubber or polyisoprene - isoprene ($2$-methyl-$1,:3$-butadiene).

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Match column 1 with column 2


List I List II
1 PET a garden hoses, shoe soles
2 High-density polyethylene b soft drink bottles, detergent bottles
3 Poly vinyl chloride c squeeze bottles, dry cleaning bags
4 Low-density polyethylene d milk bottles, shopping bags

  1. 1-d, 2-a, 3-b, 4-c

  2. 1-b, 2-d, 3-a, 4-c

  3. 1-c, 2-a, 3-b, 4-d

  4. 1-b, 2-c, 3-a, 4-b
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

PET is a clear, tough polymer with exceptional gas and moisture barrier properties. PET's ability to contain carbon dioxide (carbonation) makes it ideal for use in soft drink bottles. 


HDPE is used in milk, juice and water containers in order to take advantage of its excellent protective barrier properties. 


PVC provides excellent clarity, puncture resistance and cling.

 LDPE offers clarity and flexibility. It is used to make bottles that require flexibility.


1-b, 2-d, 3-a, 4-c

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following is an alternative copolymer?

  1. Styrene

  2. Neoprene
  3. Nylon - $2$ - nylon - $6$
  4. Nylon - $6$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alternative polymers are those polymers which are formed by only two monomeric units which are alternatively arranged in polymeric chain Nylon - $2$ - nylon - $6$.
The formation is shown in the reaction below:
$HOOC-(CH _2) _4-COOH + H _2N-(CH _2) _2-NH _2 \rightarrow -[NH(CH _2) _2NHCO(CH _2) _4CO] _n- + nH _2O$

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Orion and Acrilan are fibres of well-known textile materials of the same name. They are copolymers of:

  1. styrene and butadiene

  2. alcohol and ester

  3. acrylonitrile and 2-vinylpyridine

  4. methane and acetone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Orlon is also known as polyacrylonitrile hence is the copolymer of acrylonitrile.

Acrilan is also a copolymer of acrylonitrile.

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Vinylite resins are copolymers of vinyl acetate and vinyl chloride. They are resistant to wear and tear to chemicals. One of their well-known uses is in:

  1. floor coverings

  2. ropes

  3. tyres

  4. electrical insulators
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$\text{Vinylite resins are well known used in Floor coverings so that to resist chemicals from it.}$

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following is not a homopolymer?

  1. Butyl rubber

  2. Neoprene

  3. Natural rubber

  4. Nitrile rubber
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation
A homopolymer plastic is one that is produced by the polymerization of a single monomer.
Butyl rubber, sometimes just called "butyl", is a synthetic rubber, a copolymer of isobutylene with isoprene. 
Neoprene is a homopolymer of chlorobutadiene.
Natural rubber is from the monomer isoprene (2-methyl-1,3-butadiene).
Nitrile rubber, also known as Buna-N, is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene. 
Thus Butyl rubber and nitrile rubber are not homopolymers
Options A  and D are correct.
Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following polymers contains $1,: 3$-butadiene as one of the monomers ?

  1. Butyl rubber

  2. Nitrile rubber

  3. ABS plastic

  4. SBR
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation
The polymers Nitrile rubber,  ABS plastic and SBR contains $1,\: 3$-butadiene as one of the monomers. 

Butyl rubber is copolymer of isobutylene and isoprene.  

Nitrile rubber (Buna - N) is copolymer of acrylonitrile and $1,\: 3$-butadiene.
 
ABS plastic is copolymer of $1,\: 3$-butadiene and acrylonitrile. 

SBR (Buna S) is copolymer of $1,\: 3$-butadiene and styrene.