Paper like thin plastic articles can be produced by
Polycaprolactum is also known as
Main constituent of natural rubber is
In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres.
Low density polythene as compared to high density polythene is
Which of the following is stretched into fibres ?
Which of the following is not a polyolefin ?
Zeigler process
Phosphates (e.g., triceresyl, tributyl, tetrabutyl, tripheyl etc.) are added to polymers to act as
Polyvinyl alcohol is used as a
Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.
Nylon 6 as compared to nylon6 has lower
Polyhexamethylene adipimide is also known as
__________ scrap can be recycled & reutilised.
In nylon-the first and second numbers (i.e.,respectively designate the number of carbon atoms present in the
Polycondensation of saturated dicarboxylic acid with polyhydric alcohol produces
Phenol formaldehyde is produced by condensation polymerisation. It is also known as
Thermosplastic materials
Silicone resins, which are highly water repellant and has good heat resistance can not be used
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher
Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ?
Synthetic rubber
Cellulose content in bomboo fibre is about __________ percent.
Unbreakable crockeries are made from __________ polymers.
Thermal pyrolysis of ethylene dichloride produces
Dacron is a/an
Polymethyl methacrylate, which is an acrylic resin, is also called
Which of the following is a polymer of hexamethylene diamine and adipic acid ?
Polyvinyl acetate is never used for making
Pick out the wrong statement.
Which of the following rubbers has the widest service temperature range (-to 275°C) ?
Poly tetra flouro ethylene (PTFE) is known as
Vulcanisation of rubber does not increase its
Which of the following is a copolymer ?
__________ is an addition polymer
Branched chair polymers as compared to linear polymers have
Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the
In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ?
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
Which of the following has the weakest intermolecular forces ?
__________ is normally used for the manufacture of refrigerator components and transistor parts.
Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser ?
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
Which of the following is not the commercial name of polymethylmethacrylate (PMMA) ?
Vulcanisation of rubber
Polymerisation process in which two or more monomers of chemically different nature take part is called
Identify the group in which all the polymers mentioned can be used to make fibres.
Branched chain polymers compared to linear polymers have higher
Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is
Vulcanisation of rubber does not increase its