Elsevier

Polymer

Volume 29, Issue 2, February 1988, Pages 311-319
Polymer

Polymer paper
Dielectric relaxations of microstructurally different latex polymer blends of poly(butyl acrylate) and poly(vinyl acetate)

https://doi.org/10.1016/0032-3861(88)90339-4Get rights and content

Abstract

The dielectric permittivity and loss of latex films of poly(butyl acrylate), poly(vinyl acetate), their homogeneous blend and their core-shell structured particle blends were measured in the temperature range 80–360 K and frequency range 10−2×105 Hz. Poly(butyl acrylate) has two sub-Tg relaxations, namely β- and γ-processes. The presence of one polymer antiplasticizes the other in that their α-relaxation processes are shifted to higher temperatures in the blends. The homogeneous blends have relaxation features characteristic of both the poly(butyl acrylate) and poly(vinyl acetate) but at temperatures different from those of the pure polymer lattices. Only one β-relaxation is observed for the blend lattices. It has a very large half-width, and appears at a temperature intermediate to those of the β-relaxations in the pure polymers. The core-shell microstructure of the polymer particles produces a latex which shows evidence for the presence of a copolymer in its films, although the particles contained no copolymer in their emulsified state.

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