--%>

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 : Finding Normality Can someone please

    Can someone please help me in getting through this problem. Concentrated H2SO4 has a density of 1.98 gm/ml and is 98% H2SO4 by weight. The normality is: (a) 2 N  (b) 19.8 N  (c) 39.6 N  (d) 98

  • Q : Lowering of vapour pressure Help me to

    Help me to go through this problem. Lowering of vapour pressure is highest for: (a) urea (b) 0.1 M glucose (c) 0.1M MgSo4 (d) 0.1M BaCl2

  • Q : Vander Waals forces Wax is an example

    Wax is an example of: (a) Ionic crystal  (b) Covalent crystal  (c) Metallic crystal  (d) Molecular crystalAnswer: (d) Iodine crystals are molecular crystals, in which constituent particles are molecules having inter particle

  • Q : Describe various systems for

    Common system According to this system, the individual members are named according to alkyl groups att

  • Q : Molecular Symmetry Types The number of

    The number of molecular orbitals and molecular motions of each symmetry type can be deduced. Let us continue to use the C2v point group and the H2O molecule to illustrate how the procedure develop

  • Q : From where the tin is obtained From

    From where the tin is obtained? Briefly illustrate it.

  • Q : Problem on Osmotic Pressure of solution

    The osmotic pressure of a 5% solution of cane sugar at 150oC  is (mol. wt. of cane sugar = 342)(a) 4 atm (b) 3.4 atm (c) 5.07 atm (d) 2.45 atmAnswer: (c) Π = (5 x 0.0821 x 1000 x 423)/(342 x 100) = 5.07 atm

  • Q : Strength of dilute acid of Sulfuric acid

    Select the right answer of the question.10ml of conc.H2SO4 (18 molar) is diluted to 1 litre. The approximate strength of dilute acid could be: (a)0.18 N (b)0.09 N (c) 0.36 N (d)1800 N

  • Q : Molarity in Nacl The molarity of 0.006

    The molarity of 0.006 mole of NaCl in 100 solutions will be: (i) 0.6 (ii) 0.06 (iii) 0.006 (iv) 0.066 (v) None of theseChoose the right answer from above.Answer: The right answer is (ii) M = n/ v(

  • Q : HCl polarity Illustrate HCl is polar or

    Illustrate HCl is polar or non-polar?