Polymethyl methacrylate (PMMA) which is also known as Perspex and is produced by bulk polymerisation of methyl methacrylate is not a ______________ polymer?
Correct answer: B. Thermosetting
- A. Thermoplastic
- B. Thermosetting
- C. Linear
- D. Glass like transparent
Explanation
PMMA is a linear thermoplastic that softens on heating and is valued for its glass-like transparency. It is not thermosetting because it does not form an irreversible cross-linked network during ordinary processing.
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