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首页> 外文期刊>Journal of Applied Polymer Science >ADIABATIC REACTION CALORIMETRY FOR DATA ACQUISITION OF FREE-RADICAL POLYMERIZATIONS
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ADIABATIC REACTION CALORIMETRY FOR DATA ACQUISITION OF FREE-RADICAL POLYMERIZATIONS

机译：用于自由基聚合数据采集的绝热反应量热法。

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This article deals with the determination of kinetic and thermodynamic data of free-radical polymerization by adiabatic reaction calorimetry. The polymerization of methyl methacrylate in solution, suspension, and emulsion were chosen as systems to be studied. From the measured temperature-time courses of the polymerizations the overall rate constants can be determined with and without gel effect. With knowledge of an appropriate mathematical model describing the kinetics of reaction it was also possible to estimate elementary reaction constants if the molecular weight distribution of the polymer formed was considered as well. The temperature rise and the self-heating rate can be modeled very well for polymerization in solution over the entire range of concentration and, in the case of polymerization in suspension and emulsion, up to a volume fraction of monomer of 20%. The modeling of molecular weight distribution of polymers produced by polymerization in solution and suspension is satisfactory. For emulsion polymerization, however, only the order of magnitude of the average molecular weight could be calculated with the model used. The average particle size of the polymer latex formed could be calculated rather well. (C) 1997 John Wiley & Sons, Inc. [References: 27]
机译：本文涉及通过绝热反应量热法测定自由基聚合反应的动力学和热力学数据。选择在溶液，悬浮液和乳液中的甲基丙烯酸甲酯的聚合作为要研究的体系。根据所测量的聚合反应的温度-时间进程，可以确定有无凝胶效应的总速率常数。如果适当考虑了描述反应动力学的数学模型，并且也考虑了所形成聚合物的分子量分布，也可以估算基本反应常数。对于溶液在整个浓度范围内的聚合，可以很好地模拟温度升高和自热速率，在悬浮液和乳液聚合的情况下，单体的体积分数最高为20％。通过在溶液和悬浮液中聚合产生的聚合物的分子量分布的模型是令人满意的。但是，对于乳液聚合，只能使用所使用的模型计算平均分子量的数量级。可以很好地计算出形成的聚合物胶乳的平均粒度。 （C）1997 John Wiley＆Sons，Inc. [参考：27]

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