Polymer Technology Which of the following is not a natural polymer? Polysaccharides Polyurethane Polyisoprene Nucleic acids e.g. RNA and DNA Polysaccharides Polyurethane Polyisoprene Nucleic acids e.g. RNA and DNA ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to Reduce its viscosity to permit easier processing Reduce the time of vulcanisation and quantity of vulcanising agent Increase its viscosity Protect rubber goods from attack by oxygen & ozone present in the atmosphere Reduce its viscosity to permit easier processing Reduce the time of vulcanisation and quantity of vulcanising agent Increase its viscosity Protect rubber goods from attack by oxygen & ozone present in the atmosphere ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent. 1000-1500 2000-2500 1-1000 1500-2000 1000-1500 2000-2500 1-1000 1500-2000 ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Styrene butadiene rubber (SBR) as compared to natural rubber has Poorer resistance Greater amount of heat build up heavy loading Poor tensile strength All of these Poorer resistance Greater amount of heat build up heavy loading Poor tensile strength All of these ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Polypropylene is preferred to polythene, because the former is Non-inflammable Harder Both B & C Stronger Non-inflammable Harder Both B & C Stronger ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Polycondensation reaction of polymerisation Does not need any catalyst Produces epoxy polymers Produces only thermoplastic material Does not produce linear polymers Does not need any catalyst Produces epoxy polymers Produces only thermoplastic material Does not produce linear polymers ANSWER DOWNLOAD EXAMIANS APP
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