--%>
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 : Mole fraction of solute The mole

    The mole fraction of the solute in 1 molal aqueous solution is: (a) 0.027 (b) 0.036 (c) 0.018 (d) 0.009What is the correct answer.

    		•
  • Q : Cons of eating organic foods Illustrate

    Illustrate the cons of eating organic foods?

    		•
  • Q : Molar mass Select the right answer of

    Select the right answer of the question. Which is heaviest: (a)25 gm of mercury (b)2 moles of water (c)2 moles of carbon dioxide (d)4 gm atoms of oxygen

    		•
  • Q : DNA Organic Explain DNA organic in

    Explain DNA organic in brief?

    		•
  • Q : What is Henry law constant and its

    1. The units of Henry Law constant are same as those of pressure, i.e. torr or h bar. 2. Different gases have dissimilar values of Henry law constant. The values of KH for some gases in water are given in tabl

    		•
  • Q : Thermodynamics I) Sulphur dioxide (SO2)

    I) Sulphur dioxide (SO2) with a volumetric flow rate 5000cm3/s at 1 bar and 1000C is mixed with a second SO2 stream flowing at 2500cm3/s at 2 bar and 200C. The process occurs at steady state. You may assume ideal gas behaviour. For SO2 take the heat capacity at constant pressure to be CP/R = 3.267

    		•
  • Q : Question based on mole concept Help me

    Help me to solve this Question. The number of moles of SO2Cl2 in 13.5 gm is in is : (a) 0.1 (b) 0.2 (c) 0.3 (d) 0.4

    		•
  • Q : Explain solid in liquid solutions. The

    The French chemist Francois Marie Raoult (1886) carried out a series of experiments to study the vapour pressure of a number of binary solutions. On the basis of the results of the experiments, he proposed a generalization called Raoult's law which states that, <

    		•
  • Q : Can protein act as the buffer Can

    Can protein act as the buffer? Briefly comment on that statement.

    		•
  • Q : Difference among hcl gas and hcl acid

    What is the basic difference among hcl gas and hcl acid? Briefly state the difference?

    		•