1Chapter 6Noncrystalline and Semicrystalline Materials•Introduction•Glass Transition Temperature•Viscous Deformation•Structure and Properties of Amorphous and Semi-crystalline Polymers•Structure and Properties of Glasses•Structure and Properties of Rubbers and Elastomers
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2Introduction•The emphasis thus far has been on crystalline materials. •There are numerous engineering materials that lack the long range translational periodicity of a crystalline material. •These non-crystalline materials are referred to as either-amorphous, glassy, or super-cooled liquids.•Theoretically, any material can form an amorphous structure if the cooling rate from the melt is sufficiently rapidto suppress crystal formation.•This chapter will emphasize the structural considerations that facilitate the development of an amorphous structure.