Morphology evolution and the tri-continuous morphology formation of a PVDF/PS/HDPE ternary blend in melt mixing
Morphology evolution and the tri-continuous morphology formation of a PVDF/PS/HDPE ternary blend in melt mixing
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DOI：
10.1039/c6ra07877j
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发表时间：
2016-04
期刊：
影响因子：
3.9
通讯作者：
Yan Shao;Rui Dou;Shuang Li;B. Yin;Ming‐bo Yang
中科院分区：
文献类型：
--
作者：
Yan Shao;Rui Dou;Shuang Li;B. Yin;Ming‐bo Yang
本文研究了PVDF/PS/HDPE体系的三连续相形态演变和形成过程。通过使用密炼机熔融混合来制备共混物。通过扫描电镜和光学显微镜分析其形貌。其稳定形态的演变经历了三个阶段：首先，大部分PS分散在HDPE中，然后PS全部迁移到PVDF/HDPE界面，最后，一部分PS液滴迁移到HDPE相中，即为稳定形态。此外，研究了PS体积分数对稳定形貌的影响，结果表明：PS体积分数对形成三连续形貌的亚包裹体结构影响不大，PS层厚度与PS含量呈明显的线性关系; HDPE/PS的粘度比对PS的稳定形态和连续性水平有重要影响，当粘度比大于1时，不能形成三连续形态，当粘度比约为1时，可以观察到完美的三连续结构;当粘度比小于1时，观察到的形态是三连续形态和亚包裹体结构的组合。
Tri-continuous morphology evolution and the formation of a PVDF/PS/HDPE system were studied in this paper. The blends were prepared by melt mixing using an internal mixer. The morphology was analyzed by scanning electron microscopy and optical microscopy. The evolution of the stable morphology would undergo three stages: firstly, most of PS dispersed in HDPE and then all of PS migrated into the interface of PVDF and HDPE; in the end, a portion of PS droplets moved into the HDPE phase and that is the stable morphology. Additionally, the effect of the PS volume fraction on the stable morphology was studied, and the results demonstrated that the PS volume fraction played only a little role on the sub-inclusion structure when the tri-continuous morphology was formed and the thickness of the PS layer shows a clear linear relationship with the content of PS; the viscosity ratio of HDPE/PS is of significant importance on the stable morphology as well as the continuity level of PS, when the viscosity ratio is greater than 1, the tri-continuous morphology cannot form, if the viscosity ratio is about 1, a perfect tri-continuous structure can be observed; when the viscosity ratio is less than 1, the morphology observed is combination of a tri-continuous morphology and sub-inclusion structure.