Question

Which of the following are characteristics of thermosetting polymers?

• A. Heavily branched cross-linked polymers
• B. Linear or slightly branched long chain molecules
• C. Become infusible on moulding so cannot be reused
• D. Soften on heating and harden on cooling, can be reused.

Answer 1

Answer: (A), (B)

The correct options are
A Heavily branched cross-linked polymers
B Linear or slightly branched long chain molecules

Thermosetting polymers: These polymers are cross-linked or heavily branched molecules, which on heating undergo extensive cross-linking in molds and again become infusible. These cannot be reused.