Characteristic Dynamic Rheological Response to Phase Separation for Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blends

Abstract

Abstract: On the basis of phase separation temperatures (T_c) for poly (methyl methacrylate )/poly-(styrene-co-acrylonitrile) (PMMA/SAN) blends with different compositions, measured by small angle laser light scattering (SALLS), we have studied the dynamic rheological behavior of these blends at various temperatures below, near and above T_c.The results showed that the time-temperature superposition principle could be applied and the linear viscoelastic response emerged in the terminal region at temperatures below T_c.However, it was found that the breakdown of time-temperature superposition principle appeared, and viscoelastic response was deviated from the linear behavior in the terminal region at temperatures near and above T_c.

Key words: Poly (methyl methacrylate) /poly (styrene-co-acrylonitrile) blends, Dynamic rheological behavior, Time-temperature superposition, Phase separation

CLC Number:

O631

TrendMD:

DU Miao, WANG Li-Qun, YANG Bi-Bo, SONG Xu-Bing, ZHENG Qiang. Characteristic Dynamic Rheological Response to Phase Separation for Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blends[J]. Chem. J. Chinese Universities, 2002, 23(5): 961.

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Characteristic Dynamic Rheological Response to Phase Separation for Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blends

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