Polymer Technology In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of Polyamides Phenol formaldehyde resins Cross linked polystyrene Polyesters Polyamides Phenol formaldehyde resins Cross linked polystyrene Polyesters ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology __________ is produced by polymerisation of chloroprene. Butyl rubber Neoprene Polyurathane rubber Thiokol (a polysulphide rubber) Butyl rubber Neoprene Polyurathane rubber Thiokol (a polysulphide rubber) ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Thermosetting polymers as compared to thermoplastic polymers Have linear structure None of these Are formed by addition polymerisation Have three dimensional structure Have linear structure None of these Are formed by addition polymerisation Have three dimensional structure ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Low pressure Zeigler process of polythene manufacture Employs a pressure of 30 kgf/cm² Produces very low density polythene Achieves an yield of 95-98% based on ethylene Does not use any catalyst for polymerisation Employs a pressure of 30 kgf/cm² Produces very low density polythene Achieves an yield of 95-98% based on ethylene Does not use any catalyst for polymerisation ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent. 2000-2500 1-1000 1000-1500 1500-2000 2000-2500 1-1000 1000-1500 1500-2000 ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. Polyester Polyacrylonitrile Polypropylene Nylon Polyester Polyacrylonitrile Polypropylene Nylon ANSWER DOWNLOAD EXAMIANS APP
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