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By completely biodegradable, we mean that, by interactions with the environment (natural chemicals, microorganisms, oxygen, heat, sunlight, etc.), the material deteriorates and returns to virtually the ______ state in which it existed prior to the initial processing. Engineering materials exhibit varying degrees of recyclability and biodegradability.

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The tensile plastic deformation of spherulitic polymers occurs in several stages as both amorphous tie chains and chain-folded block segments (which separate from the ribbon-like lamellae) become oriented with the ______ axis.

Increasing the ______ and/or diminishing the strain rate leads to reductions in tensile modulus and tensile strength and an enhancement of ductility.

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.