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首页> 外文期刊>Journal of Applied Polymer Science >On-line Monitoring of Methyl Methacrylate-Vinyl Acetate Emulsion Copolymerization
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On-line Monitoring of Methyl Methacrylate-Vinyl Acetate Emulsion Copolymerization

机译：甲基丙烯酸甲酯-乙酸乙烯酯乳液共聚合的在线监测

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An adaptive calorimetric method, coupled with state estimators for emulsion copolymerization,is shown to provide accurate,on-line information on the evolution of the composition and kinetics of an emulsion copolymerization.This method was evaluated for the emulsion copolymerizaion of methyl methacrylate-vinyl acetate (MMA-VAc)under nonisothermal conditions.In addition to providing on-line estimates of the number of moles of each polymerizaing species in the reactor,the state estimator provides a value for a lumped kinetic parameter proportional to the product of nN_p.This information can be combined with off-line measurements to study the evolution of polymerization kinetics and to explain the trends observed for the molecular weight distribution and glass transition temperatures.Values n were found to vary from 0.5 to 30 for the homopolymerization of MMA.However,the presence of VAc in the copolymerizing system drastically reduces n.Thsi can lead to a dramatic increase in the average molecular weight of the copolymer since it alters the ratio of propagation to termination in the polymerizaing particles.
机译：自适应量热法与乳液共聚的状态估计器结合使用，可提供有关乳液共聚反应的组成演变和动力学的准确在线信息。该方法用于评估甲基丙烯酸甲酯-乙酸乙烯酯的乳液共聚反应。 （MMA-VAc）在非等温条件下。除了提供对反应器中每种聚合物质的摩尔数的在线估计之外，状态估计器还提供了与nN_p乘积成比例的集总动力学参数值。可以与离线测量结合使用，以研究聚合动力学的演变并解释观察到的分子量分布和玻璃化转变温度的趋势。发现MMA的均聚值n在0.5到30之间变化。共聚体系中VAc的存在会大大降低n.Thsi会导致平均m急剧增加共聚物的分子量，因为它改变了聚合颗粒中传播与终止的比率。

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