Condensation polymerisation of __________ produces bakelite. Urea & formaldehyde Phenol & formaldehyde Propylene Phenol & acetaldehyde TRUE ANSWER : ? YOUR ANSWER : ?
Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6. 50 to 75 -20 to 25 100 to 150 250-280 TRUE ANSWER : ? YOUR ANSWER : ?
Diphenylamine is added to rubber to Make it thermosetting Protect it from deterioration on exposure to air Valcanise it Make it non-inflammable TRUE ANSWER : ? YOUR ANSWER : ?
Plasticisers are added to synthetic plastics to Develop new improved properties not present in the original resin All of these Improve workability during fabrication Impart flexibility TRUE ANSWER : ? YOUR ANSWER : ?
Size range of polymer molecules varies from __________ metre. 10⁻⁸ to 10⁻¹⁰ 10⁻¹ to 10⁻² 10⁻⁴ to 10⁻⁷ 10⁻² to 10⁻⁵ TRUE ANSWER : ? YOUR ANSWER : ?
__________ tubes are good substitude for human blood vessels onrheart by-pass operation. Teflon/dacron Polystyrene PVC Polythene TRUE ANSWER : ? YOUR ANSWER : ?
__________ is not a condensation polymer. Polystyrene Teflon Dacron Nylon-66 TRUE ANSWER : ? YOUR ANSWER : ?
The physical state in which polymers exist is Melts & rubber like state Amorphous glassy state All of these Partially crystalline state TRUE ANSWER : ? YOUR ANSWER : ?
Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is Bakelite Polyester Nylon-66 Teflon TRUE ANSWER : ? YOUR ANSWER : ?