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首页> 外文期刊>Journal of Applied Polymer Science >Course of degradation and build-up reactions in isotactic polypropylene during peroxide decomposition
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Course of degradation and build-up reactions in isotactic polypropylene during peroxide decomposition

机译：等规聚丙烯在过氧化物分解过程中的降解和累积反应过程

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摘要

In the investigation of the course of degradation and build-up reactions during the decomposition of the tert-butyl perbenzoate (TBPB) (at eight different concentrations) in isotactic polypropylene (iPP), it was found that, at the beginning of the peroxide decomposition at all investigated peroxide concentrations from 4.62-200 mmol/kg iPP, the degradation reactions of iPP prevailed. At the TBPB concentration of less than or equal to 37.0 mmol/kg IPP during the whole period of peroxide decomposition, degradation reactions leading to a lower of molecular mass of PO prevailed. But at higher peroxide concentrations of TBPB greater than or equal to 74.4 mmol/kg iPP and at the later stage of peroxide decomposition, a predominance of the build-up reactions, that is, an increase the molecular mass, was observed. The degradation and build-up reactions were determined from the measurements of the melting-flow indexes of the peroxide-treated iPP samples. The reaction mechanism of the degradation and build-up reactions in iPP is discussed. (C) 2000 John Wiley & Sons, Inc. [References: 21]
机译：在对全同立构聚丙烯（iPP）中过苯甲酸叔丁酯（TBPB）（八种不同浓度）分解过程中的降解和聚集反应过程的研究中，发现过氧化物开始分解在所有调查的过氧化物浓度为4.62-200 mmol / kg iPP的情况下，iPP的降解反应占主导。在整个过氧化物分解期间，TBPB浓度小于或等于37.0 mmol / kg IPP时，导致PO分子量降低的降解反应占主导。但是在更高的TBPB过氧化物浓度大于或等于74.4 mmol / kg iPP时，并且在过氧化物分解的后期，观察到堆积反应占优势，即分子量增加。通过对过氧化物处理的iPP样品的熔体流动指数进行测定，确定降解和堆积反应。讨论了iPP中降解和积累反应的反应机理。 （C）2000 John Wiley＆Sons，Inc. [参考：21]

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