Segmental orientation in plastically deformed glassy PMMA

In this study, spatial orientational distribution functions of labeled chain segments of cross-linked and linear PMMA were obtained by solid-state NMR as a function of finite deformation (far) below and (far) above the glass transition temperature T g . The applied data analysis allows comparison of...

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Bibliographic Details
Published in:Journal of the mechanics and physics of solids 2006-03, Vol.54 (3), p.589-610
Main Authors: Wendlandt, Michael, Tervoort, Theo A., van Beek, Jacco D., Suter, Ulrich W.
Format: Article
Language:English
Subjects:
Glassy polymers
Segmental orientation
Solid-state NMR
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Summary:In this study, spatial orientational distribution functions of labeled chain segments of cross-linked and linear PMMA were obtained by solid-state NMR as a function of finite deformation (far) below and (far) above the glass transition temperature T g . The applied data analysis allows comparison of theoretical predictions and experimental data, both in terms of the orientational probability distributions as a function of two polar angles, as well as in terms of moments of the distribution. Orientation–strain relationships of chain segments agreed above and below T g with predictions from the rubber-elastic affine network model, but suggests a much denser network below T g than given by the cross-link density or the entanglement density in the melt. This suggested network structure is believed to be the generator of segmental orientation during plastic deformation in the glassy state, independent of the range of applied cross-link densities and deformation rates used in this study.
ISSN:0022-5096
DOI:10.1016/j.jmps.2005.09.007