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首页> 外文期刊>RSC Advances >Effect of polystyrene long branch chains on melt behavior and foaming performance of poly(vinyl chloride)/graphene nanocomposites
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Effect of polystyrene long branch chains on melt behavior and foaming performance of poly(vinyl chloride)/graphene nanocomposites

机译：聚苯乙烯长支链对聚氯乙烯/石墨烯纳米复合材料熔融行为和发泡性能的影响

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摘要

Several poly(vinyl chloride)-g-polystyrene graft copolymers (PVC-g-PS) with well defined molecular structures were synthesized via atom transfer radical polymerization (ATRP) from the structural defects of PVC. The effects of PS branch chains on the shear and extensional rheology as well as foaming properties were investigated. Compared to linear PVC, the introduction of PS branches results in increased complex viscosity, an elevated value of storage modulus at low shear frequencies, more pronounced shear-thinning behavior, more significant upshifted deviation from linear behaviour and a strain hardening phenomenon. Under the same foaming conditions, most of the resulting PVC-g-PS foams exhibit a closed cell structure, increased cell density and uniform cell size distribution while the linear PVC foam has serious cell coalescence. Moreover, graphene nanosheets could be well dispersed in the PVC-g-PS matrix due to the pi-pi stacking with PS relative to the PVC without PS branch chains. As expected, both the nucleation effect and increased melt viscosity from well-dispersed graphene sheets significantly improve the foaming behavior of PVC-g-PS/graphene nanocomposites, in comparison with the poor foamability of PVC/graphene composites due to the non-uniform dispersion of graphene.
机译：通过原子转移自由基聚合（ATRP），从PVC的结构缺陷中合成了几种分子结构明确的聚（氯乙烯）-g-聚苯乙烯接枝共聚物（PVC-g-PS）。研究了PS支链对剪切和拉伸流变学以及发泡性能的影响。与线性PVC相比，PS支链的引入导致复数粘度增加，在低剪切频率下储能模量值升高，剪切变稀行为更加明显，线性行为的上移偏差更大以及应变硬化现象。在相同的发泡条件下，大多数所得的PVC-g-PS泡沫表现出闭孔结构，增加的孔密度和均匀的孔尺寸分布，而线性PVC泡沫则具有严重的孔聚结。此外，由于相对于没有PS支链的PVC，由于pi-pi与PS堆叠，因此石墨烯纳米片可以很好地分散在PVC-g-PS基质中。如预期的那样，与由于分散不均匀而导致的PVC / g-PS /石墨烯纳米复合材料的发泡性差相比，良好分散的石墨烯片的成核作用和增加的熔体粘度均显着改善了PVC-g-PS /石墨烯纳米复合材料的发泡性能。石墨烯。

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