题目内容

Upon cooling, this phenomenon corresponds to the gradual transformation from a liquid into a rubbery material, and finally into a rigid solid. With decreasing temperature there is a reduction in the ______ of large segments of molecular chains.

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The magnitudes of Tm and Tg increase with increasing chain stiffness; stiffness is enhanced by the presence of chain double bonds and side ______ that are either bulky or polar.

At low molecular weights Tm and Tg ______ with increasing molecular weight.

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