Chemically recycled monomer feed streams from postconsumer plastic packaging waste are expected to contain impurities that act as catalyst poisons. This work investigates the impact of such impurities on a commercial fourth-generation Ziegler–Natta catalyst system. A recycled monomer feed stream in two different procedures by adding representative catalyst poisons (pyridine and n-butanol) in various quantities to the reactor setup is simulated. Measuring catalyst activity and molecular weight distribution (MWD) and performing kinetic and MWD deconvolution modeling, the impact of the catalyst poisons on polymer product properties at the microstructural level is evaluated. The results demonstrate that, beyond a certain concentration (120 ppm), catalyst poisons have a substantial impact on the activity levels of the catalyst system tested. MWD deconvolution modeling shows an influence of the poisons on the composition of the resulting polymer product in the form of a shift toward lower or higher molecular weights (depending on the procedure). This microstructural analysis highlights the importance of purifying chemically recycled monomer feed streams.

中文翻译：

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源自化学回收塑料废物的毒物对齐格勒-纳塔催化剂性能的影响

来自消费后塑料包装废物的化学回收单体进料流预计会含有充当催化剂毒物的杂质。这项工作研究了这些杂质对商业第四代齐格勒-纳塔催化剂体系的影响。通过添加代表性催化剂毒物（吡啶和n-丁醇）在反应器设置中的不同数量进行了模拟。测量催化剂活性和分子量分布 (MWD) 并进行动力学和 MWD 解卷积建模，评估催化剂毒物在微观结构水平上对聚合物产品性能的影响。结果表明，超过一定浓度（120 ppm），催化剂毒物对所测试的催化剂体系的活性水平有很大影响。MWD 解卷积模型显示毒物对所得聚合物产品的组成的影响，其形式为向更低或更高分子量的转变（取决于程序）。这种微观结构分析强调了纯化化学回收单体进料流的重要性。