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首页> 外文期刊>Journal of Applied Polymer Science >Structure development and interfacial interactions in high-density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation
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Structure development and interfacial interactions in high-density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

机译：具有优选取向的高密度聚乙烯/羟基磷灰石（HDPE / HA）复合材料的结构发展和界面相互作用

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摘要

Composites of high-density polyethylene (HDPE) filled with sintered and nonsintered hydroxyapatite (HA) powders, designated as HAs and HAns, respectively, were compounded by twin screw extrusion. Compounds with neoalkoxy titanate or zirconate coupling agents were also produced to improve interfacial interaction and filler dispersion in the composites. The composites were molded into tensile test bars using (i) conventional injection molding and (ii) shear-controlled orientation in injection molding (SCORIM). This latter molding technique was used to deliberately induce a strong anisotropic character to the composites. The mechanical characterization included tensile testing and microhardness measurements. The morphology of the moldings was studied by both polarized light microscopy and scanning electron microscopy, and the structure developed was assessed by wide-angle X-ray diffraction. The reinforcing effect of HA particles was found to depend on the molding technique employed. The higher mechanical performance of SCORIM processed composites results from the much higher orientation of the matrix and, to a lesser extent, from the superior degree of filler dispersion compared with conventional moldings. The strong anisotropy of the SCORIM moldings is associated with a clear laminated morphology developed during shear application stage. The titanate and the zirconate coupling agents caused significant variations in the tensile test behavior, but their influence was strongly dependent on the molding technique employed. The application of shear associated with the use of coupling agents promotes the disruption of the HA agglomerates and improves mechanical performance. (C) 2002 Wiley Periodicals, Inc. [References: 70]
机译：通过双螺杆挤出将填充有烧结和未烧结的羟基磷灰石（HA）粉末的高密度聚乙烯（HDPE）复合材料分别复合。还制备了具有新烷氧基钛酸酯或锆酸酯偶联剂的化合物，以改善界面相互作用和填料在复合材料中的分散。使用（i）常规注塑成型和（ii）注塑成型中的剪切控制取向（SCORIM）将复合材料成型为拉伸测试棒。后一种成型技术用于故意诱导复合材料具有很强的各向异性。机械特性包括拉伸测试和显微硬度测量。通过偏光显微镜和扫描电子显微镜研究了模制品的形态，并通过广角X射线衍射评估了所形成的结构。发现HA颗粒的增强效果取决于所采用的成型技术。 SCORIM处理的复合材料具有更高的机械性能，其原因是基体的取向度高得多，而在较小程度上，则是由于填料的分散度优于常规模制品。 SCORIM模塑件的强各向异性与在剪切应用阶段形成的清晰的层压形态有关。钛酸酯和锆酸酯偶联剂引起拉伸试验性能的显着变化，但是它们的影响在很大程度上取决于所采用的模塑技术。与偶联剂的使用相关的剪切的施加促进了HA附聚物的破坏并改善了机械性能。 （C）2002 Wiley Periodicals，Inc. [参考：70]

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