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Rheological characterization of styrene acrylonitrile copolymers

机译:苯乙烯丙烯腈共聚物的流变学表征

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摘要

The relationship between copolymer composition, molecular weight distribution, and rheological properties of random styrene acrylonitrile copolymers synthesized by radical polymerization in bulk was investigated. From differential scanning calorimetry analysis, glass transition temperature was obtained and increases with the acrylonitrile content. The knowledge of the glass transition is a key factor to compare the different copolymers in an iso-free volume condition for melt rheology. Owing to time temperature superposition, a large frequencies window ranging from the terminal zone until the glassy plateau can be obtained. Thus, the mechanical spectroscopy was used to estimate the rubbery plateau modulus and the Newtonian viscosity. (C) 2000 John Wiley & Sons, Inc. [References: 25]
机译:研究了通过自由基聚合本体合成的无规苯乙烯丙烯腈共聚物的共聚物组成,分子量分布和流变性能之间的关系。通过差示扫描量热分析,获得了玻璃化转变温度并且其随着丙烯腈含量的增加而升高。玻璃化转变的知识是在等体积体积条件下比较不同共聚物进行熔体流变学研究的关键因素。由于时间温度的叠加,可以获得从终端区到玻璃态高原的大频率窗口。因此,使用机械光谱法来估计橡胶态平稳模量和牛顿粘度。 (C)2000 John Wiley&Sons,Inc. [参考:25]

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