Characterization of the Phase separation in PMMA/α-MSAN Blends Using the Dynamic Viscoelastic Functions

Abstract

Abstract: The dynamic viscoelasticity of poly(methyl methacrylate)/poly(α-methylstyrene-co-acrylonitrile)(PMMA/α-MSAN) blends in the molten state was measured. By examining the correlation between dynamic storage modulus(G ′) and dynamic lose modulus (G ″), it was found that for the two components, the plots of lgG ′vs. lgG ″show no discernible or a little temperature dependence, and the slopes of the plots in the terminal region approach 2. But for PMMA/ α-MSAN blends, the slopes are less than₂, exhibiting temperature dependence relevant to compositions of the blends. By comparing the lgG ′ vs. lgG ″ correlation between the two components and the blends, we obtained so called "critical temperatures(Tb)", which are useful for characterizing the phase separation of PMMA/ α-MSAN blends.

Key words: Poly(methyl methacrylate), Poly(α-methylstyrene co acrylonitrile), Blend melt, Dynamic viscoelastic functions, Phase-separation

CLC Number:

O631

TrendMD:

ZHENG Qiang, ARAKI Osamu, MASUDA Toshiro. Characterization of the Phase separation in PMMA/α-MSAN Blends Using the Dynamic Viscoelastic Functions[J]. Chem. J. Chinese Universities, 1998, 19(8): 1339.

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Characterization of the Phase separation in PMMA/α-MSAN Blends Using the Dynamic Viscoelastic Functions

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