Journal
POLYMERS & POLYMER COMPOSITES
Volume 21, Issue 6, Pages 367-375Publisher
ISMITHERS
DOI: 10.1177/096739111302100605
Keywords
Polymer blend; Compatibility/morphology; Poly(methyl methacrylate)/poly(vinyl alcohol); Viscoelastic properties
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Dynamic viscoelastic properties and morphology of poly(methyl methacrylate) (PMMA)/poly(vinyl alcohol) (PVA) blend prepared by melt kneading was investigated. These solubility parameter values differ greatly. Two kinds of PVA with saponification degrees of 88 and 98 mol.% were used. Micrometre-order domains were observed by scanning electron microscopy for 88 mol.% PVA, whereas no clear domain was observed for 98 mol.%. Both the blends were incompatible systems because two loss modulus peaks based on PMMA and PVA were observed by dynamic mechanical analysis. The loss modulus peak based on the PMMA-rich phase was higher than that of pure PMMA; the increase of the corresponding glass transition temperature (T-g) caused by blending was more remarkable for 98 mol.% PVA than 88 mol.%. It was thought that the intermolecular interaction of OH group in PVA and carbonyl group in PMMA caused the increase in T-g, but no clear evidence of the interaction for the blend was observed by a Fourier transform. infrared spectroscopic analysis. The poly(vinyl acetate)/PMMA blend was incompatible. The unsaponificated vinyl acetate unit in PVA decreased the interaction between PMMA and PVA. This is the reason why the effect of T-g rising was lower for 88 mol.% PVA than for 98 mol.%.
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