Controlled Synthesis, Characterization, and Flow Properties of Ethylene-Diene Copolymers
Controlled Synthesis, Characterization, and Flow Properties of Ethylene-Diene Copolymers
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DOI：
10.1002/mren.201800071
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发表时间：
2019-06-01
影响因子：
1.5
通讯作者：
Soulages, Johannes M.
中科院分区：
文献类型：
--
作者：
Das, Chinmay;Elguweri, Muhiddin;Soulages, Johannes M.
支化缠结树脂的流动响应由组成分子的支化拓扑结构决定，这是使用工业相关复杂树脂的实验分析工具无法直接获得的特性。本文报道了乙烯、1,9-癸二烯和己烯或辛烯在连续搅拌釜反应器中使用茂金属催化剂的受控三聚反应。使用各种分析工具对合成的样品进行了广泛的表征，并通过小振幅振荡剪切和启动单轴延伸实验测量了它们的流变特性。为聚合过程开发了一个模型，合成过程中的质量平衡对速率常数提供了严格的约束。通过蒙特卡罗采样生成的计算机模拟分子系综用于重现实验结果。计算机模型使我们能够推断分子的详细支化结构并预测该合成的反应器条件的最佳范围。
The flow response of branched entangled resins is dominated by the branching topology of the constituent molecules, a property that is not directly accessible using experimental analytical tools for industrially relevant complex resins. In this paper, the controlled terpolymerization of ethylene, 1,9-decadiene, and either hexene or octene in a continuous stirred tank reactor with a metallocene catalyst, is reported. The synthesized samples are characterized extensively with various analytical tools and their rheological properties are measured with small amplitude oscillatory shear and start-up uniaxial extension experiments. A model is developed for the polymerization process with the mass balance during synthesis providing strong constraints on the rate constants. In silico ensembles of molecules, generated via Monte Carlo sampling, are used to reproduce the experimental results. The computer model allows us to infer the detailed branching structure of the molecules and to predict the optimum range of reactor conditions for this synthesis.