Effect of injection molding on structure and properties of poly(styrene‐ethylene‐butylene‐styrene) and its nanocomposite with functionalized montmorillonite
Effect of injection molding on structure and properties of poly(styrene‐ethylene‐butylene‐styrene) and its nanocomposite with functionalized montmorillonite
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DOI：
10.1002/app.49633
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发表时间：
2021-01
影响因子：
3
通讯作者：
Xiaoyan Li;Hui Yu;X. Kang;Gang Chen;Ming Zhu;Jianjun Xu
中科院分区：
文献类型：
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作者：
Xiaoyan Li;Hui Yu;X. Kang;Gang Chen;Ming Zhu;Jianjun Xu
本文研究了注射成型对聚苯乙烯-乙烯-丁烯-苯乙烯（SEBS）及其官能化蒙脱土（FMMT）纳米复合材料结构和性能的影响，并与热压成型的结果进行了比较。注射成型的SEBS及其FMMT纳米复合材料具有皮核形态，FMMT血小板更优先地沿着样品平面排列，而热压样品则不是。注射成型样品也具有致密的结构，微相分离程度较小。在注射成型过程中，封闭腔内存在温度梯度和高压的高剪切流动和凝固，极大地影响了SEBS及其纳米复合材料的形貌和结构。结果还表明，SEBS的软段与接枝到FMMT上的长烷基硅烷链之间存在吸引的相互作用，使得FMMT在高速高压注射成型后形成宏观的网状结构。SEBS/FMMT注入纳米复合材料具有最高的抗拉强度和最佳的耐腐蚀性，这可归因于致密的皮芯结构，更强的SEBS/FMMT相互作用和优先排列的FMMT血小板。
In this paper, the effects of injection molding on structure and properties of poly(styrene‐ethylene‐butylene‐styrene) (SEBS) and its nanocomposite with a functionalized montmorillonite (FMMT) were illustrated by comparison with the results of hot pressing. The injection‐molded SEBS and its FMMT nanocomposite have a skin‐core morphology with FMMT platelets more preferentially aligned along the sample plane, while hot‐pressed samples not. The injection‐molded samples also have a dense structure, and a less extent of microphase separation. In the injection molding process, the high shear flow coupled with solidification in presence of temperature gradient and high pressure in the closed cavity greatly affect the morphology and structure of the SEBS and its nanocomposites. The results also indicate attractive interaction between the soft segments of SEBS and the long alkyl silane chain grafted to FMMT, which allows FMMT to form a macroscopic network structure after the high‐speed and high‐pressure injection molding. The SEBS/FMMT‐injected nanocomposite have the highest tensile strength and the best corrosion resistance, which can be attributed to the dense skin‐core structure, stronger SEBS/FMMT interaction and the preferentially aligned FMMT platelets.