Polymer Technology Cross linked polymers are Fibres only Thermosetting Either A or B Thermoplastic Fibres only Thermosetting Either A or B Thermoplastic ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Epoxy resins (i.e., epoxide polymers) Use emulsion polymerisation methods Are cross-linked polymers only Are made by addition polymerisation reaction only Contain an epoxy group ( ##### ) at the ends of the polymer Use emulsion polymerisation methods Are cross-linked polymers only Are made by addition polymerisation reaction only Contain an epoxy group ( ##### ) at the ends of the polymer ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology 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? Polyester Nylon-6 Bakelite (phenol formaldehyde) Polythene Polyester Nylon-6 Bakelite (phenol formaldehyde) Polythene ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Thermosetting resins/polymers as compared to thermoplastic ones are Soluble in all organic solvents Formed by addition polymerisation only Easily reshaped & reused More brittle Soluble in all organic solvents Formed by addition polymerisation only Easily reshaped & reused More brittle ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to Reduce the time of vulcanisation and quantity of vulcanising agent Reduce its viscosity to permit easier processing Increase its viscosity Protect rubber goods from attack by oxygen & ozone present in the atmosphere Reduce the time of vulcanisation and quantity of vulcanising agent Reduce its viscosity to permit easier processing Increase its viscosity Protect rubber goods from attack by oxygen & ozone present in the atmosphere ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but Saturated polyester Polyamide Polyacrylonitrile Alkyd resin Saturated polyester Polyamide Polyacrylonitrile Alkyd resin ANSWER DOWNLOAD EXAMIANS APP
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