--%>
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 : P- block why pentahalids are more

    why pentahalids are more covalent than tetrahalids

    		•
  • Q : How haloalkanes are prepared from

    This is the common method for preparing haloalkanes in laboratory. Alcohols can be converted to haloalkanes by substitution of - OH group with a halogen atom. Different reagents can be used to get haloa

    		•
  • Q : Molar conductance what is the molar

    what is the molar conductance of chloropentaamminecobalt(III) chloride?

    		•
  • Q : Question based on relative lowering of

    Give me answer of this question. When a non-volatile solute is dissolved in a solvent, the relative lowering of vapour pressure is equal to: (a) Mole fraction of solute (b) Mole fraction of solvent (c) Concentration of the solute in grams per litre (d) Concentratio

    		•
  • Q : Describe chemical properties of amines.

    Like ammonia, primary, secondary and tertiary amines have a single pair of electrons on N atom. Hence chemical behavior of amines is similar to ammonia. Amines are basic in nature, and in most of the reactions they act as nucleophiles.      1. Reaction wi

    		•
  • Q : Equimolar solutions Select the right

    Select the right answer of the question. Equimolar solutions in the same solvent have : (a)Same boiling point but different freezing point (b) Same freezing point but different boiling poin (c)Same boiling and same freezing points (d) Different boiling and differe

    		•
  • Q : Basic concept Give me answer of this

    Give me answer of this question. The volume of water to be added to 100cm3 of 0.5 N N H2SO4 to get decinormal concentration is : (a) 400 cm3 (b) 500cm3 (c) 450cm3 (d)100cm3

    		•
  • Q : Quantum Mechanical Operators The

    The quantum mechanical methods, illustrated previously by the Schrödinger equation, are extended by the use of operators. Or, w

    		•
  • Q : Excel assignment I want it before 8 am

    I want it before 8 am tomorow please. I am just wondering how much is going to be ?

    		•
  • Q : What is Ideal Mixtures Ideal mixing

    Ideal mixing properties can be recognized in the formation of an ideal gas mixture from ideal gases. Consider the formation of a mixture of gases i.e. a gaseous solution, from two mixtures of pure gases. A useful characterization of an ideal mixture, or soluti

    		•