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Evaluation of Thermally Induced Degradation of Branched Polypropylene by Using Rheology and Different Constitutive Equations

机译：用流变学和不同本构方程评估支链聚丙烯的热诱导降解

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摘要

In this work, virgin as well as thermally degraded branched polypropylenes were investigated by using rotational and Sentmanat extensional rheometers, gel permeation chromatography and different constitutive equations. Based on the obtained experimental data and theoretical analysis, it has been found that even if both chain scission and branching takes place during thermal degradation of the tested polypropylene, the melt strength (quantified via the level of extensional strain hardening) can increase at short degradation times. It was found that constitutive equations such as Generalized Newtonian law, modified White-Metzner model, Yao and Extended Yao models have the capability to describe and interpret the measured steady-state rheological data of the virgin as well as thermally degraded branched polypropylenes. Specific attention has been paid to understanding molecular changes during thermal degradation of branched polypropylene by using physical parameters of utilized constitutive equations.
机译：在这项工作中，通过使用旋转和Sentmanat延伸流变仪，凝胶渗透色谱法和不同的本构方程，研究了原始的和热降解的支化聚丙烯。根据获得的实验数据和理论分析，发现即使在被测聚丙烯热降解过程中发生断链和支链断裂，熔体强度（通过拉伸应变硬化水平量化）也会在短时间降解时增加。次。发现本构方程，例如广义牛顿定律，改进的White-Metzner模型，Yao和Extended Yao模型，具有描述和解释原始以及热降解支化聚丙烯的稳态流变数据的能力。通过利用所利用的本构方程的物理参数，已特别注意理解支化聚丙烯热降解过程中的分子变化。

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