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Common resin (matrix) families used in PMC are EPOXY, POLYESTER, and VINYL ESTER. Of these, EPOXY is preferred for HIGH-PERFORMANCE aerospace primary structure because:
A{'text': 'It conducts electricity', 'label': 'D'}
B{'text': 'Best balance of strength, low shrinkage on cure, good fiber adhesion, and chemical/moisture resistance — at the cost of higher price and longer cure cycle', 'label': 'B'}
C{'text': 'It is cheapest', 'label': 'A'}
D{'text': 'It is the only thermoset', 'label': 'C'}
Answer & Solution
Correct answer: B. {'text': 'Best balance of strength, low shrinkage on cure, good fiber adhesion, and chemical/moisture resistance — at the cost of higher price and longer cure cycle', 'label': 'B'}
Epoxy: ~2-4 GPa tensile, low shrinkage (~2%), excellent adhesion via amine/anhydride cross-linking. Polyester is cheaper but shrinks more (~7%), weaker adhesion. Vinyl ester is intermediate. Aerospace prioritizes performance over cost, hence epoxy dominance.
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