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Effect of filler on rheologic and thermodynamic characteristics of binary polymeric mixture melts

✍ Scribed by Yu. S. Lipatov; V. F. Shumsky; V. F. Rosovitsky; I. P. Getmanchuk; N. A. Kvitka

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
703 KB
Volume
47
Category
Article
ISSN
0021-8995

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✦ Synopsis

Rheologic, thermodynamic, and mechanical loss tangent properties of a binary polymeric mixture were studied. The system was a mixture of poly(viny1 acetate) (PVA) with ethylenevinyl acetate copolymer (EVC) with varying concentrations of the polymer components and filler. A correlation between the above characteristics of the PVA/EVC two-phase mixture was found. This mixture was thermodynamically unstable (positive values of the interaction parameter, x ) practically over the entire range of compositions at temperatures of rheologic studies. The presence of a disperse filler raised the thermodynamic stability, that is, parameter x decreased. Reversal of the sign of the temperature dependence of X of a mixture with increasing concentration of filler was found. The variations of viscosity with the composition, temperature, and shear for the PVA/EVC mixture are ascribed to different levels of heterogeneity occurring in the process of the shear straining in the working unit of the rheometer.

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