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首页> 外文期刊>RSC Advances >In situ ozonolysis of polypropylene during extrusion to produce long-chain branches with?the aid of TMPTA
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In situ ozonolysis of polypropylene during extrusion to produce long-chain branches with?the aid of TMPTA

机译：借助TMPTA在挤出过程中对聚丙烯进行原位臭氧分解以产生长链分支

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摘要

The introduction of long-chain branches (LCBs) in polypropylene (PP) during the extrusion process is normally induced by peroxide chemicals which are known to lead to the formation of secondary products in the resin. Here we report a novel synthesis method to prepare LCB-PP via in situ ozonolysis during reactive extrusion in the presence of a multifunctional agent. Depending on the fast ozonation of molten PP molecules, free radicals can be generated in PP macromolecules and induce chain scission reactions during extrusion. LCB structures of PP could be formed when a multifunctional agent, trimethylolpropane triacrylate (TMPTA), was added into the PP matrix during extrusion. The effect of reaction temperature, polymer flow rate and TMPTA concentration on the LCB-PP structures is discussed. Molecular parameters of LCB-PP were detected by MALS SEC technique. Various rheological plots including elongation rheological properties were applied to distinguish the LCB structures in PP samples. Without residues and by-products of peroxide in the final polymer resin, this synthesis method of LCB-PP has highly efficient and easily adjustable merits.
机译：在挤出过程中，聚丙烯（PP）中长链支链（LCB）的引入通常是由过氧化物化学物质引起的，众所周知，过氧化物化学物质会导致在树脂中形成次级产品。在这里，我们报告了一种新型的合成方法，可以在多功能剂存在的情况下，通过反应挤压过程中的原位臭氧分解法制备LCB-PP。取决于熔融PP分子的快速臭氧化作用，PP大分子中会产生自由基，并在挤出过程中引起断链反应。当在挤出过程中将多功能剂三羟甲基丙烷三丙烯酸酯（TMPTA）添加到PP基体中时，可以形成PP的LCB结构。讨论了反应温度，聚合物流速和TMPTA浓度对LCB-PP结构的影响。用MALS SEC技术检测LCB-PP的分子参数。应用各种流变图（包括伸长流变特性）来区分PP样品中的LCB结构。 LCB-PP的这种合成方法在最终的聚合物树脂中没有残留物和过氧化物的副产物，具有高效且易于调节的优点。

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