21. A copolymer is formed by the combination of two or more monomer molecules
22. Orlan fibre which is used as a wool sub stitute is
23. Zeigler - Natta catalyst (AlR3 - AlCl3) is used in the polymerisation of
24. Size range of polymer molecules varies from __________ metre.
25. __________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.
26. A copolymer of vinyl and vinylidine chloride is called
27. Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature.
28. Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness?
29. Styrene butadiene rubber (SBR) is never used for making
30. Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are
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