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High density polythene is obtained by...

High density polythene is obtained by

A

polymerisation of ethene in a hydrocarbon solvent in the presence of Ziegler - Natta catalyst

B

polymerisation of ethene under high pressure and temperature

C

free radical polymerisation of ethene at low temperature in presence of peroxide

D

polymerisation of ethene in presence of carbon tetrachloride

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The correct Answer is:
A
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High density polymer is not

(a) Give the common and IUPAC name of the monomer of natural rubber. (b) How is high density polythene obtained? What structural difference it has from low density polythene? (c) Name a copolymer which is used for making non- breakable plastic crockery? (d) Write the names and give the structures of the monomers of Nylon-6,6.

Low density polythene is prepared by

Statement -1: High density polythene is form when addittion polymerisation of ethene takes place in a hydrocarbon solvent in the presence of a catalyst Ziegler-Natta catalyst at a temperature of 333k to 343k and under a pressure of 6-7 atmosphere. Statement -2: High density polythene consists of linear molecules and has a high density due to closed packing and it is used for manufacturing buckets, dustbins, bottles. select correct option regarding these statements.

NCERT FINGERTIPS-POLYMERS -Types Of Polymerisation Reaction
  1. During addition polymerisation of ethene molecules , the initiator lik...

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  2. Low density polythene (LDP) is used in the insulation of electricity c...

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  3. High density polythene is obtained by

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  4. High density polymer is not

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  5. The difference in the densities of low density (LDP) and high density ...

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  6. Composition of Ziegler-Natta catalyst is

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  7. Which of the following polymers is not correctly matched ?

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  8. Terylene is a condensation polymer of ethylene glycol and

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  9. Nylon 6,6 is obained by condensation polymerisation of

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  10. Synthetic polymer prepared by using caprolactam is known as

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  11. Which of the following is a condensation polymer ?

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  12. Which of the following is not correctly matched ?

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  13. Formation of nylons and polyesters are called step growth polymerisat...

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  14. Match the polymers given in column I with the monomers in column II an...

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  15. Polymer which has amide linkage is

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  16. Dacron is an example of:

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  17. Which of the following polymers does not involve cross-linkages ?

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  18. Which among the following is a cross-linked polymer ?

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  19. Novolac on heating with formaldehyde undergoes to form an infusible s...

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  20. Identify X and Y in the given polymerization reactions .

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