Thermosetting polymers, such as Bakelite and Urea-formaldehyde resins, become infusible hard masses upon initial heating and cannot be remolded. Which fundamental structural change causes this?

Question

Prashant Kotian · Accepted Answer

Correct answer: C. Thermosetting polymers are heavily branched or cross-linked molecules. Upon heating, they undergo extensive chemical cross-linking between different polymeric chains to yield a rigid, infusible, and insoluble three-dimensional network. This process is irreversible.

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