When addition polymerisation of ethene takes place in a hydrocarbon solvent in the presence of ziegler-Natta catalyst, it forms:
LDP
HDP
Polyacrylnitrile
Teflon
Which of the following polymers is prepared by condensation polymerisation ?
Teflon
Styrene
Rubber
Nylon 6, 6
Buna-N synthetic rubber is a copolymer of:
H2C=CH-CN and H2C=CH-CH=CH2
H2C=CH-CN and H2C=CH-=CH2
H2C=CH-=CH and H2C=CH-CH=CH2
H2C=CH-CH=CH2 and H5C6-CH=CH2
Which one of the following molecules undergoes polymerisation to form natural rubber?
Styrene
2-methyl-1, 3-butadiene
Ethylene
Iso-butene
Three dimensional molecules with cross links are formed in the case of a :
thermoplastic
thermosetting plastic
Both (a) and (b)
None of these
Among the following substituted silanes, the one which will give rise to cross-linked silicone polymer on hydrolysis is
R3SiCl
R4Si
RSiCl3
R2SiCl2
C.
RSiCl3
RSiCl3 on hydrolysis gives a cross- linked silicone. The formation can be explained in three steps:
(i) RSiCl3 RSi(OH)3
(ii)
(iii)