--%>
Assignment Help - homework help

What is synthetic rubber and how it gets prepared?

To meet human needs, scientists have started preparing synthetic rubbers. Besides having similar properties as natural rubbers they are tougher, more flexible and more durable than natural rubber. They are capable of getting stretched to twice its length. Though, it reverts to its original shape and size once the external stretching force is released.


Synthetic rubbers have been made by the polymerisation of dienes other than isoprene. The polymerisation is carried out in the presence of Zeigher-Natta catalyst. For example, Polymerisation of 1, 3-butadiene

Preparation of synthetic rubbers

1. Neoprene or polychloro prene is formed by the free radical polymerisation of chloroprene.

It has superior resistance to vegetable and mineral oils. It is used for manufacturing of conveyer belts, gaskets and hoses.

2. Buna-N: you have previously studied about Buna-S. Buna-N is obtained by the copolymerization of 1, 3-butadiene and Acrylonitrile in the presence of a peroxide catalyst.

2175_synthetic rubber.png 

It is resistant to the reaction of petrol, lubricating oil and organic solvents. It is utilized in making oil seals, tank lining etc.

 

 

 

   Related Questions in Chemistry

  • Q : Henry law question Answer the following

    Answer the following qustion. The definition “The mass of a gas dissolved in a particular mass of a solvent at any temperature is proportional to the pressure of gas over the solvent” is: (i) Dalton’s Law of Parti

    		•
  • Q : Problem based on normality Choose the

    Choose the right answer from following. NaClO solution reacts with H2SO3 as,. NaClO + H2SO3→NaCl+ H2SO4. A solution of NaClO utilized in the above reaction contained 15g of NaClO per litre. The

    		•
  • Q : Problem on relative humidity Relative

    Relative humidity is the ratio of the partial pressure of water in air to the partial pressure of water in air saturated with water at the same temperature, stated as a percentage: Relative  =

    Q : Difference in Mendeleevs table and

    Briefly describe the difference in the Mendeleev’s table and modern periodic table?

    		•
  • Q : Electrochemistry ( electrolysis of

    1. Define Faraday's first law of electrolysis 2. define Faraday's second law of electrolysis

    		•
  • Q : Dipole moment of chloro-octane Describe

    Describe the dipole moment of chloro-octane in brief?

    		•
  • Q : From where the tin is obtained From

    From where the tin is obtained? Briefly illustrate it.

    		•
  • Q : Molarity of the final mixture Can

    Can someone please help me in getting through this problem. Two solutions of a substance (that is, non electrolyte) are mixed in the given manner 480 ml of 1.5M first solution + 520 ml of 1.2M second solution. Determine the molarity of the final mixture

    		•
  • Q : Units of Measurement Unit of

    Unit of measurement- These are also some systems for units:      (1) C.G.S.

    		•
  • 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

    		•