The rate controlling step in the manufacture of silicone rubber is the None of these Condensation of siloxane to silicone Polymer termination step Initial hydrolysis of silicone monomer TRUE ANSWER : ? YOUR ANSWER : ?
Polyesters are manufactured by the polycondensation reaction of Carboxylic acid with ethylene Dibasic acid with dihydric alcohol Inorganic acid with ethylene glycol A single monomer TRUE ANSWER : ? YOUR ANSWER : ?
Polyvinyl alcohol is used as a Cation/anion exchanger Water soluble adhesive Non-sticky coating on frying pans Textile fibre TRUE ANSWER : ? YOUR ANSWER : ?
Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is 7 kgf/cm² and 70 °C 7 kgf/cm² and 700°C 1 kgf/cm² (gage) and 70°C 1000 kgf/cm² and 100°C TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not a polyolefin? Neoprene Polypropylene Polystyrene None of these TRUE ANSWER : ? YOUR ANSWER : ?
Thermosetting resins/polymers as compared to thermoplastic ones are Soluble in all organic solvents More brittle Formed by addition polymerisation only Easily reshaped & reused TRUE ANSWER : ? YOUR ANSWER : ?
Nylon 6 as compared to nylon 6, 6 has lower Adhesion to rubber Hardness Abrasion resistance Thermal stability TRUE ANSWER : ? YOUR ANSWER : ?
Pickout the wrong statement. The intermoleculer forces in ther-mosplastic polymers are intermediate to that of elastomers & fibres Polymers made of more than one monomer is called copolymer or mixed polymer Polymers made of only one monomer is called homopolymer Vulcanised rubber is more elastic than natural rubber TRUE ANSWER : ? YOUR ANSWER : ?
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 Cross linked polystyrene Phenol formaldehyde resins Polyesters TRUE ANSWER : ? YOUR ANSWER : ?
The monomer of natural rubber is Isoprene Both B and C DMT 2 methyl-1-propene TRUE ANSWER : ? YOUR ANSWER : ?