Structural and Mechanical Behavior of Polymethylmethacrylate Containing Diethyl Siloxane Oligomer

Using the method of positron annihilation, structural changes induced by introduction of diethyl siloxane oligomers to PMMA were studied. The effect of these structural changes on the mechanical behavior of PMMA was discussed in terms of structural inhomogeneity of PMMA: existence of structural subl...

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Bibliographic Details
Published in:International journal of polymeric materials 1998-02, Vol.39 (3-4), p.319-333
Main Authors: Arzhakov, M. S., Arzhakov, S. A., Gustov, V. V., Kevdina, I. B., Shantarovich, V. P.
Format: Article
Language:English
Subjects:
low-molecular-mass additives
mechanical properties
PMMA
Polymer glasses
structure
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Summary:Using the method of positron annihilation, structural changes induced by introduction of diethyl siloxane oligomers to PMMA were studied. The effect of these structural changes on the mechanical behavior of PMMA was discussed in terms of structural inhomogeneity of PMMA: existence of structural sublevels with different packing density and ordering. Deformation of glassy polymers at low strains as well as such mechanical characteristics as yield stress and contribution of low-temperature component to the temperature-induced relaxation of plastic deformation were shown to be controlled by segmental mobility in structural sublevels with a lower packing density.
ISSN:0091-4037
1563-535X
DOI:10.1080/00914039808039776