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首页> 外文期刊>Journal of Materials Science >Preparation and foaming mechanism of foamable polypropylene based on self-assembled nanofibrils from sorbitol nucleating agents
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Preparation and foaming mechanism of foamable polypropylene based on self-assembled nanofibrils from sorbitol nucleating agents

机译：山梨醇成核剂自组装纳米原纤维制备可发泡聚丙烯的发泡机理

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摘要

A strategy to prepare foamable isotactic polypropylene (iPP) was proposed by introducing crystal nucleating agent, 1,3:2,4-bis(p-methylbenzylidene) sorbitol (S20), and the foaming mechanism was also investigated. When a proper concentration (above 0.3 wt%) of S20 was added, iPP/S20 exhibited excellent foaming performance, yielding uniform cells with well-defined structures and higher cell density than those of neat iPP. The results of rheological analysis and TEM confirmed the formation of S20 nanofibrils in iPP matrix. The existence of these nanofibrils increased the melt viscosity of iPP and enhanced the bubble nucleation in the foaming process, and thus should be responsible for the improved foaming ability of iPP. Moreover, iPP/S20 could be foamed in a remarkably wide temperature range from 143 to 163 A degrees C. In comparison, another crystal nucleating agent, sodium 2,2'-methylene-bis-(4,6-di-tert-butylphenyl)-phosphate (NA40), contributed little to the foamability of iPP although it also induced the crystallization of iPP.
机译：通过引入晶体成核剂1,3：2,4-双（对甲基苄叉基）山梨醇（S20），提出了制备可发泡等规聚丙烯（iPP）的策略，并对发泡机理进行了研究。当添加适当浓度（高于0.3 wt％）的S20时，iPP / S20表现出优异的发泡性能，与纯iPP相比，具有均匀结构的均匀孔道和更高的孔道密度。流变分析和TEM的结果证实了iPP基质中S20纳米纤维的形成。这些纳米原纤维的存在增加了iPP的熔体粘度并增强了发泡过程中的气泡成核作用，因此应负责改善iPP的发泡能力。而且，iPP / S20可以在143至163 A的极宽温度范围内发泡。相比之下，另一种晶体成核剂2,2'-亚甲基-双-（4,6-二叔丁基苯基）钠）-磷酸盐（NA40）对iPP的发泡性几乎没有贡献，尽管它也诱导了iPP的结晶。

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