Thermoplastic materials become ________ when heated

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Multiple Choice

Thermoplastic materials become ________ when heated

Explanation:
When thermoplastics are heated, their long polymer chains gain mobility and the material becomes soft and pliable. The lack of permanent cross-links means heat lowers the interactions that hold the chains in a rigid arrangement, allowing them to slide past each other and flow more easily. This softness is what lets thermoplastics be molded and reshaped; if heated to higher temperatures, some can melt into a liquid, but they will harden again as they cool. This reversible softening behavior is what sets thermoplastics apart from thermosetting plastics, which stay hard after curing.

When thermoplastics are heated, their long polymer chains gain mobility and the material becomes soft and pliable. The lack of permanent cross-links means heat lowers the interactions that hold the chains in a rigid arrangement, allowing them to slide past each other and flow more easily. This softness is what lets thermoplastics be molded and reshaped; if heated to higher temperatures, some can melt into a liquid, but they will harden again as they cool. This reversible softening behavior is what sets thermoplastics apart from thermosetting plastics, which stay hard after curing.

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