--%>
Assignment Help - homework help

What are condensation polymers? Give examples.

These types of polymers are formed as a result of condensation reaction between monomer units. Some common examples are being discussed here:


1. Polyesters
2047_condensation polymers.png 

(i) Terelene: It is a polymer obtained by the condensation reaction between ethylene glycol and terephthalic acid

Characteristics and uses: Terelene is resistant to the action of chemical and biological substances and also to abrasion. It has a less moisture absorbing capacity. As such it is widely used in making wash and wear fabrics. The polyster textile fabrics made from the polymer are marketed under the trade name Terelene or Dacron.

It is used as a blend with cotton and wool in clothing. It is also utilized in seat belts and sails. The polymer is also used as mylar in the preparation of films, magnetic recording tapes and for packing frazen food. Dacron (and Teflon) tubes are god substitutes for human blood vessels in heart by-pass operations.

(ii) Glyptic or Alkyd Resin: Glyptal is a common name of all polymers prepared by condensation of di-basic acids, and polyhydric alcohols. The simplest glyptal is poly (ethylene glycol phthalate) which is obtained by the condensation of ethylene glycol and pthlatic acid.

Characteristics and uses: these are three dimensional cross-linked polymers. Poly (ethylene glycol phthalate) dissolves in suitable solvents and the solution on evaporation leaves a tough and non-flexible film. Therefore, it is utilized in:

2. Polyamides
1162_condensation polymers1.png 


1. Nylon-6, 6: It is a polymer of adipic acid (1, 6-hexaneioic acid) and hexamethylene diamine (1, 6-diaminohexane)
 


Characteristics and uses: Nylon-66 (read as nylon-six-six) can be cast into a sheet or fibres by spinning devices. Nylon fibres generally have high tensile strength. They are hard and resistant to abrasion. They are also somewhat elastic in nature. Nylon finds uses in: producing bristles and brushes, carpets and fabrics in textile industry, elastic hosiery in the shape of crinkled nylon.

2. Nylon 6, 10: It is a polymer of hexamethylene diamine (six carbon atoms) and sebacoyl chloride (ten carbon atoms)
818_condensation polymer3.png 


3. Nylon-6 (or Perlon): It is prepared from the monomer caprolactum. Caprolactum is obtained from cyclohexane according to the reaction sequence given below:

Caprolactum on heating with traces of water hydrolyses to 6-amino caproic acid which on continued heating undergoes self-condensation and polymerises to give nylon-6.

Nylon-6 finds uses in the manufacture of tyre cords, fabrics and ropes.

 

 

 

 

 

 

   Related Questions in Chemistry

  • Q : What do you mean by the term tripod

    What do you mean by the term tripod? Also state its uses?

    		•
  • Q : Solubility are halides are halogens

    are halides are halogens more soluble? why?

    		•
  • Q : Calculating molarity of a solution

    Select the right answer of the question .The molarity of a 0.2 N N2Co3 solution will be: (a) 0.05 M (b) 0.2 M (c) 0.1 M (d)0.4 M

    		•
  • Q : Why acetic has less conductivity than

    Illustrate the reason, why acetic has less conductivity than Hcl?

    		•
  • Q : What are Vander Waal's Radii? Vander

    Vander Waal's radii can be assigned to the atoms of molecules on the basis of the closeness of approach of these atoms in crystalline substances. Diffraction studies of crystals give information about hoe molecules can approach each other and can pack

    		•
  • Q : Facts on evaporation Illustrate the 3

    Illustrate the 3 facts on evaporation?

    		•
  • Q : Problem on making solution Select the

    Select the right answer of the question. The weight of H2C2O42H2O required to prepare 500ml of 0.2N solution is : (a) 126g (b) 12.6g (c) 63g (d) 6.3g

    		•
  • Q : Means of molal solution Choose the

    Choose the right answer from following. A molal solution is one that contains one mole of a solute in: (a) 1000 gm of the solvent (b) One litre of the solvent (c) One litre of the solution (d) 22.4 litres of the solution

    		•
  • Q : Effect on vapour pressure of dissolving

    Give me answer of this question. When a substance is dissolved in a solvent the vapour pressure of the solvent is decreased. This results in: (a) An increase in the b.p. of the solution (b) A decrease in the b.p. of the solvent (c) The solution having a higher fr

    		•
  • Q : Molarity of acid solution If 20ml of

    If 20ml of 0.4N, NaoH solution completely neutralises 40ml of a dibasic acid. The molarity of the acid solution is: (a) 0.1M (b) 0.2M  (c) 0.3M (d) 0.4M Choose the right answer fron above.

    		•