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Among matrices, THERMOSETS (e.g., epoxy, polyester) differ from THERMOPLASTICS (e.g., PEEK, nylon) by:
A{'text': 'Thermosets cure via IRREVERSIBLE cross-linking; thermoplastics melt and re-solidify reversibly', 'label': 'B'}
B{'text': 'Thermosets are biodegradable', 'label': 'D'}
C{'text': 'Thermosets are stronger always', 'label': 'A'}
D{'text': 'Thermoplastics are not used in composites', 'label': 'C'}
Answer & Solution
Correct answer: A. {'text': 'Thermosets cure via IRREVERSIBLE cross-linking; thermoplastics melt and re-solidify reversibly', 'label': 'B'}
Cross-linking in thermosets (epoxy, polyester, vinyl ester) is irreversible — once cured, no melting/reshaping. Thermoplastics (PEEK, PEKK, nylon) can be re-melted, supporting welding, repair, and recycling at the cost of slightly lower stiffness and creep resistance.
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