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Morphology and Molecular Motion of Polyethylene Reactor Powders pp. 45-67 $100.00
Authors:  (Hiroki Uehara, Takeshi Yamanobe)
Abstract:
For semi-crystalline polymers, it is widely accepted that several phases, including
crystalline and amorphous phases, coexist within a sample. Reactor powder morphology
forms during polymerization with non-equilibrium state, thus it inevitably contains the
intermediate phase, which connects between crystalline and amorphous phases. One of
the major differences among these phases lies in their molecular dynamics. Several
methods, such as thermal analysis and X-ray measurement, can quantitatively
characterize these different phases; however, their analytical results are usually limited to
information concerning the crystalline phase. In contrast, 1H-NMR relaxation analysis
enables separate evaluation of crystalline and amorphous molecular dynamics without the
requirement of scaling factors. Rather, such individual scaling factors, including
relaxation time scale, component percentage and decay functions, can be compared
among the phases contained in the sample, based on the 1H-NMR technique. 


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Morphology and Molecular Motion of Polyethylene Reactor Powders pp. 45-67