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首页> 外文期刊>Journal of Applied Polymer Science >The effect of tunable modification parameters on the structure and properties of polypropylene with cyclotrimerization surface of isocyanates
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The effect of tunable modification parameters on the structure and properties of polypropylene with cyclotrimerization surface of isocyanates

机译：可变改性参数对异氰酸酯环三聚化表面聚丙烯结构和性能的影响

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摘要

The cyclotrimerization of methylene diphenyl 4,4-diisocyanate (MDI) and 3-isopropenyl-,-dimethylbenzene isocyanate (TMI) was applied on the bead/membrane surfaces of a polypropylene (PP)-bearing isocyanate group to synthesize a protective networked polymer. Chemical structures of these molecules were characterized through attenuated total reflectance-Fourier transform infrared spectroscopy. Results showed that the absorption peak of isocyanate group at 2255 cm(-1) became negligible after the reaction was completed. The absorption peaks of the isocyanurate groups appeared simultaneously at 1600 cm(-1) and at 1510-1560 cm(-1); this result indicated that the grafted isocyanates were almost consumed, thereby forming isocyanurates. Energy X-ray dispersive spectroscopy revealed that oxygen content increased; indeed, isocyanurate was formed on the PP surface. Pure PP beads, PP-g-TMI, and cyclotrimerization products were also subjected to thermal property tests to investigate their corresponding thermal stabilities. Cyclotrimerization could result in the increase in PP-grafted decomposition temperature, even slightly higher than pure PP. Rheological behavior in oscillatory flow was also evaluated; the storage modulus, loss modulus, and complex viscosity of cyclotrimerization products were higher than those of the PP-grafted membranes. Surface morphology was further observed through field-emission scanning electron microscopy and atomic force microscopy. The cyclotrimerization products contained blocks and exhibited a rough surface. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43327.
机译：将亚甲基二苯基4,4-二异氰酸酯（MDI）和3-异丙烯基-，-二甲基苯异氰酸酯（TMI）进行环三聚反应，将其带到带有聚丙烯（PP）的异氰酸酯基团的珠/膜表面上，以合成保护性网络聚合物。这些分子的化学结构通过衰减全反射-傅立叶变换红外光谱进行表征。结果表明，反应完成后，异氰酸酯基在2255 cm（-1）处的吸收峰可忽略不计。异氰脲酸酯基团的吸收峰在1600 cm（-1）和1510-1560 cm（-1）处同时出现;该结果表明接枝的异氰酸酯几乎被消耗掉，从而形成异氰脲酸酯。能量X射线色散光谱表明，氧含量增加。实际上，异氰脲酸酯在PP表面形成。纯PP珠，PP-g-TMI和环三聚产物也经过热性能测试，以研究其相应的热稳定性。环三聚可能导致PP接枝的分解温度升高，甚至比纯PP高。还评估了振荡流中的流变性。环三聚产物的储能模量，损耗模量和复数粘度均高于聚丙烯接枝膜。通过场发射扫描电子显微镜和原子力显微镜进一步观察了表面形态。环三聚产物含有嵌段并显示出粗糙的表面。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43327。

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