Thermoplastics are composed of cross-linked polymer chains.
Which of the following has cross-linked polymer chains ?
(a) bakelite (b) polyester (c) PVC (d) nylon
Which of the following are characteristics of thermosetting polymers?
(a) Heavily branched cross linked polymers
(b) Linear slightly branched long chain molecules
(c) Become infusible on moulding so cannot be resused
(d) Soften on heating and harden on cooling, can be reused