__________ scrap can be recycled & reutilised.
Condensation polymerisation of caprolac-tum is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6.
Nylon-compared to nylon-6 has
Thermosetting resins/polymers as compared to thermoplastic ones are
The generic chemical name for the class of polymers which are commerically known as nylons is
Styrene butadiene rubber (SBR) is never used for making
Ion exchange resins are made of
Cation exchange resins used in water treatment is made from __________ resin.
Properties of a polymer is affected by the
In condensation polymerisation as compared to addition polymerisation
Bakelite is
The process involved in converting rubber into a thin sheet or coating it on fabric is called
Density of low density polythene is about __________ gm/c.c.
In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is
Teflon is
Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is?
Molecular weights of plastics ranges from
Non sulphonated hard bakelites are not used for making
Styrene butadiene rubber is commercially manufactured by
__________ polythene is most prone to stress-cracking
In nylon-the number 6 represents the total number of
Which of the following is not a natural polymer ?
Nylon-6 is a
Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres.
Pickout the wrong statement.
Polycondensation reaction of polymerisation
Cross linked polymers are
Size range of polymer molecules varies from __________ metre.
Which of the following natural bio polymers are formed as a result of polymerisation of amino-acids ?
Gutta parcha rubber is
__________ is produced by polymerisation of chloroprene.
Polyvinyl chloride (PVC) is
Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.
Which of the following types of polymers has the strongest inter particle forces ?
Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their
Which of the following is not an elastomer ?
Which of the following is not present in bagasse fibre ?
__________ practically possess no elasticity.
Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten
Bakelite (phenol-formaldehyde) resin can not be used as
Acrylonitrile is mainly used in the __________ industry.
Collapsible tubes for tooth paste are produced by __________ extrusion.
In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.
Rain coats are made of
Condensation polymerisation of __________ produces bakelite.
The only natural thermoplastic resin, which is a product of animal life is
Silicone is a/an
Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but
Nylon-is manufactured from
The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is