Advertisements
Advertisements
प्रश्न
What is the role of benzoyl peroxide in addition polymerisation of alkenes? Explain its mode of action with the help of an example.
उत्तर
Role of benzoyl peroxide is to generate free radicals. A variety of alkenes or dienes and their derivatives are polymerised in the presence of a free radical generating initiator (catalyst) like benzoyl peroxide, acetyl peroxide, tert-butyl peroxide, etc. For example, the polymerisation of ethene to polythene consists of heating or exposing to light a mixture of ethane with a small amount of benzoyl peroxide initiator. The process starts with the addition of phenyl free radical formed by the peroxide to the ethane double bond thus generating a new and larger free radical. This step is called chain initiating step.
APPEARS IN
संबंधित प्रश्न
Write the mechanism of free radical polymerization of ethene.
Which of the following is a natural polymer ? Buna-S, Proteins, PVC
Which of the following statements is not true about low-density polythene?
Match the polymers given in Column I with their chemical names given in Column II.
| Column I | Column II |
| (i) Nylon 6 | (a) Polyvinyl chloride |
| (ii) PVC | (b) Polyacrylonitrile |
| (iii) Acrilan | (c) Polycaprolactum |
| (iv) Natural rubber | (d) Low-density polythene |
| (v) LDP | (e) cis-polyisoprene |
Assertion: Polytetrafluoroethene is used in making non-stick cookwares.
Reason: Fluorine has highest electronegativity.
Which one of the following can be used as monomer in a polymerisation reaction?
The Ziegler Natta catalyst are
Which of the following is chain-growth polymer?
Which one of the following polymers is prepared by addition polymerisation?
Which of the following statements about low density polythene is false?
