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Morphology development during shearing of poly(ethylene oxide) melts
Author(s) -
Ulrich Robert D.,
Price Fraser P.
Publication year - 1976
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1976.070200419
Subject(s) - materials science , shearing (physics) , differential scanning calorimetry , lamellar structure , shear rate , supercooling , crystallization , composite material , shear flow , ethylene oxide , oxide , chemical engineering , polymer , copolymer , rheology , thermodynamics , metallurgy , engineering , physics
A parallel glass‐plate rotary shearing device has been constructed. This device allows direct observation of the crystallization of polymeric melts being subjected to a constant rate of shear under controlled temperature conditions. Polarized light microscopy and small‐angle light‐scattering techniques were employed to study the kinetics and morphology of poly(ethylene oxide) melts as they crystallized under various combinations of supercooling and shear rate. The techniques of epimicroscopy, differential scanning calorimetry, and wide‐angle x‐ray diffraction were used to study the already crystallized material. Crystalline aggregates developing from sheared melts showed a sheaf‐like lamellar morphology. The long axes of the sheaf‐like structures oriented perpendicular to the flow direction when crystallized under shear. This behavior can be explained in terms of hydrodynamic theory.