Q. SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at

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Q. Dacron is a/an

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Q. The main use of butadiene is

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Q. Mastication of rubber means

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Q. Polymethyl methacrylate (PMMA) is known as

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Q. Reaction of dimethyl terephthalate (DMT) and ethylene glycol produces

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Q. Tubeless tyres are made of __________ rubber, which is a co-polymer of isoprene & isobutylene.

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Q. Which of the following low molecular weight (<10⁴ ), soft & waxy polymer is used in chewing gum ?

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Q. Buna-S is a __________ material.

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Q. Zeigler - Natta catalyst (AlR₃ - AlCl₃) is used in the polymerisation of

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Q. Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of

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Q. Neoprene is a

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Q. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?

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Q. Automobile steering wheels are normally made of

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Q. In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ?

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Q. 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.

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Q. Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent.

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Q. Density of high density polythene is about __________ gm/c.c.

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Q. Vinyl flooring is done using __________ sheets.

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Q. Thiokol is nothing but

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