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Isoprene added to isobutylene gives _______

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Isoprene added to isobutylene gives _______

(a) Nitrile rubber

(b) Butyl rubber

(c) Polychloroprene rubber

(d) Silicone rubber

This question was addressed to me at a job interview.

My doubt stems from Insulating Materials topic in division Magnetic & Insulating Materials of Engineering Material & Metallurgy

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Right choice is (b) Butyl rubber

To elaborate: Butyl rubber is a polymer made from a combination of isobutylene and 3% of isoprene. It possesses low strength and high elongation, with good chemical and dielectric properties. It is mainly used for liners and inner tubes.

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