Rheological Characterization of Styrene Methyl Methacrylate Copolymers
Rheological Characterization of Styrene Methyl Methacrylate Copolymers
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DOI：
10.1080/10236660214594
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发表时间：
2002-01
影响因子：
1.9
通讯作者：
A. Arsac;A. Zerroukhi;A. Ainser;C. Carrot
中科院分区：
文献类型：
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作者：
A. Arsac;A. Zerroukhi;A. Ainser;C. Carrot
研究了苯乙烯-甲基丙烯酸甲酯（SMMA）无规共聚物的组成对其流变性能的影响。差示扫描量热（DSC）分析表明，共聚物的玻璃化转变温度随甲基丙烯酸甲酯（MMA）含量的增加而增加。玻璃化转变的知识是用来比较不同的共聚物在熔体流变学的等自由体积条件。时间温度叠加被用来得到一个大的频率窗口，从终端区到玻璃平台。特别是力学谱，被用来估计橡胶平台模量和牛顿粘度。从相应均聚物的实验值可以估计SMMA共聚物的橡胶平台模量。对于这个特定的系统，缠结之间的分子量被证明遵循简单的混合定律。
The influence of copolymer composition on the rheological properties of random copolymers of styrene with methyl methacrylate (SMMA) obtained by radical polymerization in bulk was investigated. Differential scanning calorimetry (DSC) analysis shows that the glass-transition temperature of the copolymers increases with the methyl methacrylate (MMA) content. The knowledge of the glass transition is used to compare the different copolymers in an iso-free volume condition for melt rheology. Time temperature superposition was used to get a large frequency window ranging from the terminal zone up to the glassy plateau. The mechanical spectroscopy especially, was used to estimate the rubbery plateau modulus and the Newtonian viscosity. It has been possible to estimate the rubbery plateau modulus of SMMA copolymers from the experimental values of the corresponding homopolymers. For this particular system, the molecular weight between entanglement was shown to follow a simple blending law.