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← ScienceWhich risk increases significantly when epoxy-amine adhesives experience high-temperature degradation?
A)Increased thermal expansion coefficient
B)Reduced glass transition temperature
C)Weakening of covalent bond strength✓
D)Accelerated rate of crosslinking
💡 Explanation
High temperatures trigger thermal decomposition of the epoxy-amine matrix, reducing adhesion. The dominating mechanism is chain scission, which cleaves covalent bonds. Therefore, tensile strength declines because covalent bonds weaken, rather than changes in crosslinking or physical properties under stress.
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