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Structural interpretations of mechanical properties of polycrystalline polymers
Author(s) -
Stein R. S.
Publication year - 1964
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760040308
Subject(s) - materials science , polymer , birefringence , crystallite , diffraction , crystal structure , deformation (meteorology) , crystallography , recrystallization (geology) , composite material , chemical physics , optics , chemistry , physics , paleontology , metallurgy , biology
Structural changes are considered in light of the two differing views of the structure of crystalline polymers involving either a two phase structure or a single phase structure involving detects. A compromise picture is proposed which appears consistent with existing experimental evidence. Optical methods are described for analyzing structural changes accompanying deformation of these polymers. These include x‐ray diffraction, static and dynamic birefringence measurements and dynamic light scattering studies. The results are consistent with a two stage deformation process involving first the elastic deformation of a spherulitic or crystalline structure followed by an internal rearrangement of crystals within this structure, taking place by a number of mechanisms such as recrystallization, defect migration, plastic flow and crystal rotation. The time dependence of some of these processes is studied and related to structural features.