题目内容
Increasing the ______ and/or diminishing the strain rate leads to reductions in tensile modulus and tensile strength and an enhancement of ductility.
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Large elastic extensions are possible for elastomeric materials that are amorphous and lightly ______ .
During the crystallization of a polymer, randomly oriented molecules in the liquid phase transform into chain-______ crystallites that have ordered and aligned molecular structures.
The melting of crystalline regions of a polymer corresponds to the transformation of a solid material having an ______ structure of aligned molecular chains into a viscous liquid in which the structure is highly random.
The glass transition occurs in ______ regions of polymers.
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