is brittle at low temperature
is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases.
deforms, if stretched to double of its original dimension.
is softer at higher temperature.
Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the
tanning of leather.
electrical insulation purpose.
strengthening of plaster of paris.
__________ are produced by reacting polybasic acid
(e.g. phthalic anhydride) with polyhydric alcohol
Polyesters are manufactured by the polycondensation reaction of
a single monomer.
carboxylic acid with ethylene.
dibasic acid with dihydric alcohol.
inorganic acid with ethylene glycol.
Thermosetting polymers as compared to thermoplastic polymers
None of these.
have three dimensional structure.
are formed by addition polymerisation.
have linear structure.
In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smallermolecules.
An example of step growth polymerisation product is
Epoxy resin is a polymer containing two or more groups called epoxide group or ethoxylinegroup.
It is a
surface coating agent.
polyamide & an elastomer.
both (b) and (c).
Cation exchange resins used in water treatment is made from __________ resin
Nylon-66 is manufactured from
adipic acid and hexamenthylene diamine.
dimethyl terephthalate (DMT) and ethylene glycol.
maleic anhydride and hexamethylene diamine.
__________ polythene is most prone to stress-cracking
Linear low density
Rayon is superior to cotton in making gauge for wound treatment, because rayon
both (b) and (c).
is a synthetic polymer.
does not stick to the wound unlike cotton.
can absorb over 90% of its own weight of water.
Synthetic polymer produced by using terephthalic acid and ethylene glycol is
Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from __________ resins
Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinarytemperature.
Which of the following is not a plasticiser
Esters of phthalic acid
Stearic acid estors
Polyvinyl chloride (PVC)
softening temperature is 200°C.
is produced by polycondensation reaction.
can be made thermosetting by adding a plasticiser.
uses either emulsion or suspension polymerisation methods.
Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is
aluminium triethyl combined with titanium tetrachloride
Density of high density polythene is about __________ gm/c.c
The synthetic fibres produced from __________ are known as rayon
Plastic tubes & pipes are generally made by __________ moulding
Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten
Either (B) or (C)
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