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.
is brittle at low 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
dibasic acid with dihydric alcohol.
a single monomer.
carboxylic acid with ethylene.
inorganic acid with ethylene glycol.
Thermosetting polymers as compared to thermoplastic polymers
have linear structure.
are formed by addition polymerisation.
have three dimensional structure.
None of these.
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
dimethyl terephthalate (DMT) and ethylene glycol.
maleic anhydride and hexamethylene diamine.
adipic acid and hexamenthylene diamine.
__________ polythene is most prone to stress-cracking
Linear low density
Rayon is superior to cotton in making gauge for wound treatment, because rayon
can absorb over 90% of its own weight of water.
is a synthetic polymer.
does not stick to the wound unlike cotton.
both (b) and (c).
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.
can be made thermosetting by adding a plasticiser.
uses either emulsion or suspension polymerisation methods.
is produced by polycondensation reaction.
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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