Tag: condensation polymerisation

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Questions Related to condensation polymerisation

Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Which of the following is a step-growth polymer ?

  1. Polyacrylonitrile

  2. Polyisoprene

  3. Nylon

  4. Polythene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Step-growth polymerization refers to a type of polymerization mechanism in which bi-functional or multifunctional monomers react to form first dimers, then trimers, longer oligomers and eventually long-chain polymers. 


For example, Nylon polymerizes by the step-growth polymerization process in which difunctional monomers containing equal parts of amine and carboxylic acid react so that amides are formed at both ends of each monomer 
Polyacrylonitrile, Polyisoprene and Polythene polymerize by chain-growth polymerization of acrylonitrile, isoprene ($2$-methyl-$1,:3$-butadiene) and ethene, respectively. 

Chain-growth polymerization (or addition polymerization) involves the linking together of molecules incorporating double or triple carbon-carbon bonds.

Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Polymer formation form monomers starts by:

  1. condensation reaction between monomers

  2. conversion of monomer to monomer ions by protons

  3. coordination reaction between monomers

  4. hydrolysis of monomers
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Polymerization occurs by a condensation reaction, which is a chemical reaction in which two molecules or moieties (functional groups) combine to form a larger molecule, together with the loss of a small molecule such as water, HCl etc.

Option A is correct.

Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Hair sprays generally contain resins in a volatile solvent. Upon drying, they leave a thin film that holds the hair in place. Which of the following is a resin used in hair spray?

  1. Polyester

  2. Polyvinyl alcohol

  3. Polyvinyl pyrrolidone (PVP)

  4. Polythene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$PVP$ (Polyvinyl pyrrolidone) is a versatile ingredient which is used in cosmetics and beauty industry as a bindes, film former, emulsion stabilizer, suspending agent and hair fixative used in products like mascara, eyeliner, hair conditioners, hair sprays and shampoos.
Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Which of the following polymers can be made by condensation polymerisation reaction?

  1. Dacron
  2. Nylon - $6,\: 6$

  3. Bakelite

  4. Polyethylene
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Condensation polymers are formed by repeated condensation reactions between two different bi-functional or tri-functional monomeric units. In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. takes place. 

Dacron, Nylon-6.6 and Bakelite are produced by condensation polymerisation.

On the other hand, Polyethylene is formed by breakage of the double bond and there is no elimination of molecules.