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首页> 外文期刊>Journal of Applied Polymer Science >Thermomechanical reactive blending of silicone rubber and LLDPE: Effects of processing parameters
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Thermomechanical reactive blending of silicone rubber and LLDPE: Effects of processing parameters

机译：硅橡胶和LLDPE的热机械反应共混：加工参数的影响

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摘要

To prepare thermoplastic elastomers based on linear low density polyethylene (LLDPE) and silicone rubber (SR) the reactive blending of the two polymers was carried out at different processing conditions. Effects of mixing parameters such as temperature, shear rate, mixing time, and sequence of feeding the ingredients, upon the yield and rate of interfacial reaction, have been evaluated by following the variation of mixing torque and also by determination of the reacted fraction of silicone rubber. The yield and rate of the reaction increased by increasing the temperature of mixing, shear mixing rate, and the time of mixing. Changing the sequence of feeding the ingredients also changed the yield of the reaction. First feeding of polyethylene increased the yield of reaction. According to the obtained results, interfacial reaction between two phases is limited by chemical kinetics of the reaction and by rate of mass transfer during melt mixing. The order of interfacial reaction between these two polymers under thermomechanical conditions was found to be about 1.1. Rheological studies on the blends performed by using rheomechanical spectroscopy showed a distinct rheological behavior with a non-Newtonian characteristic and higher dynamic viscosity at low frequencies for the blends prepared at high temperature and shear rate. (C) 2005 Wiley Periodicals, Inc.
机译：为了制备基于线性低密度聚乙烯（LLDPE）和硅橡胶（SR）的热塑性弹性体，在不同的加工条件下进行了两种聚合物的反应性共混。通过跟踪混合扭矩的变化以及确定硅酮的反应分数，可以评估混合参数（例如温度，剪切速率，混合时间和进料顺序）对界面反应的收率和速率的影响。橡胶。通过增加混合温度，剪切混合速率和混合时间来增加反应的产率和速率。改变成分的进料顺序也改变了反应的产率。聚乙烯的第一次进料增加了反应的产率。根据获得的结果，两相之间的界面反应受到反应的化学动力学和熔体混合过程中传质速率的限制。发现这两种聚合物在热机械条件下的界面反应的顺序为约1.1。使用流变力学光谱对共混物进行的流变学研究表明，对于在高温和高剪切速率下制备的共混物，其流变行为具有非牛顿特性，并且在低频下具有较高的动态粘度。 （C）2005 Wiley期刊公司

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