Efficiency of Different Chain-Linking Agents in the Synthesis of Long-Chain Branched Polypropylene: Molecular, Thermal, and Rheological Characterization
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引用次数: 7
Abstract
ABSTRACT Long-chain branched polypropylenes were synthesized from a maleic anhydride grafted polypropylene (PPg). Different levels of branching were generated by reactive processing using four chain-linking agents: glycerol, 1,4-butanediol, 1,4-phenylenediamine, and the epoxy resin bisphenol-A diglycidyl ether. The results from Fourier transform infrared and size-exclusion chromatography confirm the grafting of the chain-linking agents onto grafted polypropylene and the generation of long-chain branches. In addition, the rheological and morphological results show that 1,4-phenylenediamine produces the largest increment of branching at significantly lower concentrations than the other chain-linking agents. Moreover, 1,4-phenylenediamine gives place to branched polypropylenes with narrower distribution of molecular structures. GRAPHICAL ABSTRACT
摘要以顺丁烯二酸酐接枝聚丙烯(PPg)为原料合成了长链支链聚丙烯。通过使用甘油、1,4-丁二醇、1,4-苯二胺和环氧树脂双酚- a -二缩水甘油醚四种链连接剂进行反应反应，生成了不同程度的支链。傅里叶变换红外和排粒径色谱的结果证实了链连接剂在接枝聚丙烯上的接枝和长链分支的生成。此外，流变学和形态学结果表明，在较低浓度下，1,4-苯二胺比其他链连接剂产生的分支增量最大。此外，1,4-苯二胺取代了分子结构分布较窄的支链聚丙烯。图形抽象
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