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Abstract：
In this study, the impact of ethylene oxide, propylene oxide, 1,2-butene oxide, and 1,2-pentene oxide on the polymerization of propylene at an industrial level was investigated, focusing on their influence on the catalytic efficiency and the properties of polypropylene (PP) without additives. The results show that concentrations between 0 and 1.24 ppm of these epoxides negatively affect the reaction\'s productivity, the PP\'s mechanical properties, the polymer\'s fluidity index, and the PP\'s thermal properties. Fourier transform infrared spectroscopy (FTIR) revealed bands for the Ti-O bond and the Cl-Ti-O-CH2 bonds at 430 to 475 cm-1 and 957 to 1037 cm-1, respectively, indicating the interaction between the epoxides and the Ziegler-Natta catalyst. The thermal degradation of PP in the presence of these epoxides showed a similar trend, varying in magnitude depending on the concentration of the inhibitor. Sample M7, with 0.021 ppm propylene oxide, exhibited significant mass loss at both 540 °C and 600 °C, suggesting that even small concentrations of this epoxide can markedly increase the thermal degradation of PP. This pattern is repeated in samples with 1,2-butene oxide and 1,2-pentene oxide. These results highlight the need to strictly control the presence of impurities in PP production to optimize both the final product\'s quality and the polymerization process\'s efficiency.
摘要：
在这项研究中,环氧乙烷的影响，环氧丙烷,1,2-氧化丁烯,和1,2-氧化戊烯在工业水平上对丙烯的聚合进行了研究，重点研究了它们对催化效率和无添加剂聚丙烯（PP）性能的影响。结果表明，0和1.24ppm之间的浓度的这些环氧化物的负面影响反应的生产率，PP的机械性能，聚合物的流动性指数，和PP的热性能。傅里叶变换红外光谱（FTIR）揭示了Ti-O键和Cl-Ti-O-CH2键的谱带分别在430至475cm-1和957至1037cm-1，表明环氧化物和齐格勒-纳塔催化剂之间的相互作用。在这些环氧化物的存在下，PP的热降解表现出类似的趋势，根据抑制剂的浓度而变化。含0.021ppm环氧丙烷的样品M7,在540°C和600°C下均表现出明显的质量损失，表明即使这种环氧化物的浓度很小，也可以显着增加PP的热降解。在具有1,2-丁烯氧化物和1,2-戊烯氧化物的样品中重复该图案。这些结果强调需要严格控制PP生产中杂质的存在，以优化最终产品的质量和聚合过程的效率。
