Give an example of each of homopolymer and copolymer.

Homopolymers are the polymers obtained from the polymerisation of only one kind of monomer. Example: Polyethene is a homopolymer of ethene. nCH 2 = CH 2 → Polymerisation - - CH 2 - CH 2 - n - When two or more different monomers combine to give a polymer, then the polymer is called copolymer. Example: Nylon-66 is a copolymer of hexamethylenediamine and adipic acid (hexanedioic acid). nH 2 N - CH 2 6 - NH 2 + nHO - CO - CH 2 4 - CO - OH → High pressure 553 K - NH - CH 2 6 - NH - CO - CH 2 4 - CO n -

Write the name of monomer unit of polymer used in non-stick surface coated utensils.

Teflon (Polytetrafluoroethylene) is the polymer used in non-stick surface coated utensils, since it is resistance to heat and chemical attack. The monomer of teflon is tetrafluroethylene. CF 2 = CF 2 → Polymerisation - CF 2 - CF 2 n -

Write the formula to determine 'weight average molecular weight' of polymers.

The weight average molecular weight is defined as the total weight of polymer divided by the total number of molecules. The formula to determine 'weight average molecular weight' of polymers is: ( M n ) = ∑ n i m i ∑ n i where, m i is the molecular weight of the chain. n i are the number of chains with that molecular mass.

Differentiate between biodegradable and non-biodegradable polymers.

The differences between biodegradable and non-biodegradable polymers are the following: Biodegradable polymers Non-biodegradable polymers Biodegradable polymers get decomposed under aerobic or anaerobic conditions by the actions of microorganisms or enzymes. A long period is required to decompose for these types of polymers. Example- Nylon 2–Nylon 6 Example- Polyethene

Write any two differences between condensation and addition polymerization.

The differences between condensation and addition polymerization are the following: Condensation polymerization Addition polymerization Condensation polymerization is a repetitive condensation reaction between two bi-functional monomers. In addition polymerization, molecules of the same or different monomers add together to form a polymer. There is a loss of some molecules as water, alcohol, etc. in this reaction. There is no elimination in this reaction.

What is the polydispersity index for a polymer?

The polydispersity index of a polymer tells about the homogeneity of a polymer. The polydispersity index can be defined as the ratio of mass average molecular mass to the number average molecular mass. Polydispersity index PDI = Mass average molecular mass M w Number average molecular mass M n The polydispersity index of a natural polymer is usually equal to one while the polydispersity index of synthetic polymers is generally more than one.

Write monomer units of polymer Buna-N.

Polymers are large molecules that are formed by the linking of monomer units. The polymer Buna-N is made from copolymerization. The monomer units of Buna-N are the following: (i) Buta-1,3,-diene CH 2 = CH - CH = CH 2 (ii) Vinyl nitrile or Prop-2-ene-1-nitrile CH 2 = CH - CN

Write any one example of a biodegradable polymer.

The polymers which can be decomposed by the microorganism and other decomposition processes are called biodegradable polymers. A common example of a biodegradable polymer is Nylon-2-Nylon-6 which is decomposed by the microorganism.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter -1 - Polymers>Rajasthan Board-2020>Q 7

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Write monomer unit of polymer dacron.

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