有机过氧化物对中等分子量均相聚丙烯断裂的影响及作用机理

IF 1.3 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Main Group Chemistry Pub Date : 2023-09-26 DOI:10.3233/mgc-230024
M. Abd El-Wahab, M.G. El-Desouky
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引用次数: 0

摘要

在这项研究中,我们表明有机过氧化物是一种有用的工具,可以在熔体加工过程中打破聚丙烯的粘度或链,以提供一种调节的流变产品。反应挤出是将过氧化物交联并与聚丙烯(PP)结合的一种方法。为了实现性能目标的最终应用,需要稳定剂来保持聚合物的初始强度、柔韧性和韧性。除稳定剂外,还向PP中添加其他添加剂,以增强或改变其某些性能。加入不同水平的有机过氧化物[2,5-二甲基-2,5-二(叔丁基过氧)己烷]。在聚丙烯的制造过程中使用过氧化物是一种破坏聚合物链的方法,这会影响其性能,包括其MFI。增加过氧化物的用量可能会导致更高程度的分支或交联,从而导致更高的MFI值。然而,重要的是要注意,过氧化氢用量与所得MFI值之间的关系可能不是线性的,也可能取决于其他因素。除MFI外,还测量了聚丙烯的其他性能,包括剪切和熔体流动指数、熔融和结晶温度、弯曲和拉伸模量以及屈服应力。这些性质对于了解聚合物的机械和热行为非常重要,并可用于优化其特定应用的性能。
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Impact of organic peroxide on a moderate molecular weight homo-polypropylene vis breaking, and mechanism of interaction
In this study, we show that organic peroxide is a useful tool for breaking the viscosity or chain of polypropylene during melt processing to provide a regulated rheology product. Reactive extrusion is used to crosslink peroxide and combine it with polypropylene (PP). To achieve end-use applications with performance targets, stabilizers are required to preserve the polymer’s initial strength, flexibility, and toughness properties. Other additives are added to PP in addition to stabilization in order to enhance or change certain of its properties. With the addition of varying levels of organic peroxide [2,5-Dimethyl-2,5-di (tert-butyl peroxy) hexane]. The use of peroxide in the manufacturing process of polypropylene is a method of breaking in the polymer chains, which can affect its properties, including its MFI. It is possible that increasing the amount of peroxide used leads to a higher degree of branching or cross-linking, which in turn leads to a higher MFI value. However, it is important to note that the relationship between the amount of peroxide used and the resulting MFI values may not be linear and may depend on other factors as well. In addition to the MFI, other properties of the polypropylene were also measured, including shear and melt flow index, melting and crystallization temperatures, flexural and tensile moduli, and yield stress. These properties are important for understanding the mechanical and thermal behavior of the polymer and can be used to optimize its performance for specific applications.
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来源期刊
Main Group Chemistry
Main Group Chemistry 化学-化学综合
CiteScore
2.00
自引率
26.70%
发文量
65
审稿时长
>12 weeks
期刊介绍: Main Group Chemistry is intended to be a primary resource for all chemistry, engineering, biological, and materials researchers in both academia and in industry with an interest in the elements from the groups 1, 2, 12–18, lanthanides and actinides. The journal is committed to maintaining a high standard for its publications. This will be ensured by a rigorous peer-review process with most articles being reviewed by at least one editorial board member. Additionally, all manuscripts will be proofread and corrected by a dedicated copy editor located at the University of Kentucky.
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