Which can absorb over 90% of its own mass of water and does not stick to wound ?
(b) Gun cotton
(a) linear polymers
(b) soften or melt on heating
(c) molten polymer can be moulded in desired shape
(d) all of the above
Which of the following natural products is not a polymer ?
Synthetic human hair wings are made from a copolymer of vinyl chloride and acrylonitrile and is called:
Bakelite is prepared by the reaction between
(a) urea and formaldehyde
(b) ethylene glycol
(c) phenol and formaldehyde
(d) tetramethylene glycol