Tag: polymers

Quizzes (12) Questions (105)

Questions Related to polymers

Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Which of the following monomers are unsuitable for condensation polymerization?

  1. hydroxy acids

  2. butane-dioic acid and glycol

  3. diamines and dicarboxylic acids

  4. propanoic acid and ethanol
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Propanoic acid and ethanol, both are monofunctional monomers $ CH _3-CH _2- OH , CH _3-CH _2COOH$ which are not suitable for a polycondensation reaction to take place because once they combine by condensation polemerisation further polymerisation is not possible.

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.