Evaluation of oriented amorphous regions in polymer films during uniaxial deformation; structural characterization of a poly(vinyl alcohol) film during stretching in boric acid aqueous solutions
We have improved the conventional analytical method of the scattering data obtained with in‐situ synchrotron X‐ray scattering experiments, which is applicable to the structural characterization of the film during stretching. Four components of molecular chains in the film are divided from two‐dimens...
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Published in | Polymer engineering and science Vol. 55; no. 3; pp. 513 - 522 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Newtown
Blackwell Publishing Ltd
01.03.2015
Society of Plastics Engineers, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | We have improved the conventional analytical method of the scattering data obtained with in‐situ synchrotron X‐ray scattering experiments, which is applicable to the structural characterization of the film during stretching. Four components of molecular chains in the film are divided from two‐dimensional wide‐angle X‐ray diffraction patterns. These components are the oriented crystals, the unoriented ones, the oriented amorphous chains, and the unoriented ones, respectively. This method allows to evaluate directly the degree of orientation of the amorphous chains and the amount of the oriented amorphous fraction in addition to each evaluation for the crystalline regions. This method is applied to the structural characterization of the poly(vinyl alcohol) (PVA) film during stretching in boric acid aqueous solutions, suggesting that boric acid accelerates orientation of molecular chains in the amorphous regions, and increases the oriented amorphous fraction by producing the cross‐links between the PVA chains and hindering strain‐induced crystallization. At a film break on stretching in the 3 wt% boric acid solution, the oriented amorphous fraction increases up to 70%, which is much higher compared to that in the film stretched in water, 45%. POLYM. ENG. SCI., 55:513–522, 2015. © 2014 Society of Plastics Engineers |
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Bibliography: | ark:/67375/WNG-002HJV8M-G istex:4001E4D54059925734C1661B851832087EDAB7E7 ArticleID:PEN23913 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0032-3888 1548-2634 |
DOI: | 10.1002/pen.23913 |