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首页> 外文期刊>Journal of Applied Polymer Science >Montmorillonite as support for peroxide in the melt grafting of maleic anhydride onto polypropylene
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Montmorillonite as support for peroxide in the melt grafting of maleic anhydride onto polypropylene

机译：蒙脱土在马来酸酐熔融接枝到聚丙烯上时作为过氧化物的载体

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摘要

Grafting of maleic anhydride onto polypropylene was performed in a Haake torque rheometer, in the presence of organically modified montmorillonite, MMT (used as support for the peroxide), according to a 2(3) factorial design, where the maleic anhydride concentration (C-MA), peroxide concentration (C-per) and reaction time (t(r)) were varied. For comparison, the reaction in the absence of MMT was also conducted. Polypropylene degradation was assessed by parallel plate rheometry and size exclusion chromatography (SEC) and percentage of reacted maleic anhydride (%MA(g)) was obtained by titration and FTIR spectroscopy. The results showed differences in both systems, conventional and in the presence of MMT. The structure of polypropylene grafted with maleic anhydride, PP-g-MA, indicates longer branches are formed in the presence of MMT compared to in its absence, demonstrated by FTIR analysis. As in conventional reaction systems, an increase in C-per caused an increase in %MA(g) and a reduction in molar mass. The variable C-MA showed to be not significant in the grafting reaction in the presence of MMT, even at high DCP levels, at a 5% significance level. On the other hand, increase in C-MA resulted in significant increase in viscosity. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44134.
机译：根据2（3）因子设计，在有机改性的蒙脱土MMT（用作过氧化物的载体）存在下，在Haake扭矩流变仪上将马来酸酐接枝到聚丙烯上，其中马来酸酐的浓度（C- MA），过氧化物浓度（C-per）和反应时间（t（r））有所不同。为了比较，还进行了不存在MMT的反应。通过平行板流变法和尺寸排阻色谱法（SEC）评估聚丙烯降解，并通过滴定和FTIR光谱法获得反应的马来酸酐的百分比（％MA（g））。结果表明，在常规系统和MMT存在下，两种系统均存在差异。 FTIR分析表明，与不存在马来酸酐相比，接枝马来酸酐PP-g-MA的聚丙烯的结构表明，在没有MMT的情况下形成更长的支链。与常规反应系统一样，C-per的增加导致％MA（g）的增加和摩尔质量的降低。在存在MMT的情况下，即使在高DCP水平（显着水平为5％）下，变量C-MA在接枝反应中也不显着。另一方面，C-MA的增加导致粘度的显着增加。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，44134。

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