The hierarchical structure of water-assisted injection molded high density polyethylene: Small angle X-ray scattering study
The hierarchical structure of water-assisted injection molded high density polyethylene: Small angle X-ray scattering study
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水辅助注塑高密度聚乙烯的分级结构：小角X射线散射研究
DOI：
10.1002/app.36408
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发表时间：
2012-08
影响因子：
3
通讯作者：
Changyu Shen
中科院分区：
文献类型：
--
作者：
Chuntai Liu;Jingbo Chen;Xiangfang Peng;Changyu Shen
采用一种新的聚合物加工方法--水辅助注射成型（WAIM）对高密度聚乙烯（HDPE）进行了成型，并利用二维小角X射线散射（SAXS）研究了其分级结构。为了比较，还表征了通过常规注射成型（CIM）成型的HDPE的分级结构。结果表明，WAIM零件具有明显的皮芯水通道结构，这与CIM零件的皮芯结构不同。在WAIM和CIM制件的表层中，由于熔体充型带来的剪切应力，均形成串晶结构，但CIM制件的片层取向参数小于WAIM制件。由于冷却速率较低和剪切应力较弱，两部分核心处均以无规片层取向的球晶为主。有趣的是，在WAIM部件的水道层中可以发现低取向的片状结构和层状结构。这是由于水的渗透所带来的剪切应力。此外，水道层的片层取向参数小于表皮层的取向参数。WAIM部分的长周期随距离的增加先增大后减小，而CIM部分的长周期则随距离的增加而单调增大。总之，注入水带来的快速冷却速率和剪切对WAIM件的组织演变有重要影响。© 2012 Wiley Periodicals，Inc.应用聚合物科学杂志，2012年
High density polyethylene (HDPE) was molded by a new polymer processing method, that is, water-assisted injection molding (WAIM), and its hierarchical structure was studied by two-dimensional small angle X-ray scattering (SAXS). For comparison, the hierarchical structure of HDPE molded by conventional injection molding (CIM) was also characterized. The result shows that the WAIM part exhibits a distinct skin-core-water channel structure which is different from the skin-core structure for the CIM part. In the skin layer of both WAIM and CIM parts, the shish-kebab structure was formed due to the shear stress brought by melt filling, but the lamellar orientation parameter of CIM part is smaller than that of WAIM part. The spherulites with random lamellar orientation are dominant at the core of both parts owing to the low cooling rate and feeble shear stress therein. Interestingly, the shish structure and the lamellae with low level of orientation can be found at the water channel layer of WAIM part. They are attributed to the shear stress brought by water penetration. Moreover, the lamellar orientation parameter in water channel layer is smaller than that of skin layer. In addition, the long period of WAIM part first increases and then decreases with the elevating distance from the skin surface, while that of CIM part tends to increase monotonously. In a word, one can conclude that the rapid cooling rate and shear brought by the injected water have significant influence on the structural evolution for the WAIM part. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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