Gong Xing-Hou, Tang Chak-Yin, Hu Hong-Chun, Zhou Xing-Ping, Xie Xiao-Lin
Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
J Mater Sci Mater Med. 2004 Oct;15(10):1141-6. doi: 10.1023/B:JMSM.0000046397.09060.15.
High impact polystyrene (HIPS)/hydroxyapatite (HA) composites are potential biomaterials for bone replacements due to their good biocompatibility and adequate mechanical properties. At the present work, the surface of the micron-sized hydroxyapatite (HA) particles was modified by in situ polymerization of styrene (St), then compounded with HIPS. The effect of the modification of HA surface on morphology and mechanical properties of HIPS/HA composites were investigated. The results showed that the HA particles does not inhibit the polymerization of St. The PS segments coated on the HA surface by in situ polymerization of St enhances the compatibility between HA and HIPS, improves the dispersion of HA particles in HIPS matrix, and enhances the interfacial adhesion between HA and matrix. Thereby, the stiffness, tensile strength and notch impact strength of HIPS/HA composites are improved at the same time. And there is a critical coating thickness of PS on the HA surface for the optimum mechanical properties of HIPS/HA composites.
高抗冲聚苯乙烯（HIPS）/羟基磷灰石（HA）复合材料因其良好的生物相容性和足够的机械性能而成为骨替代的潜在生物材料。在本工作中，通过苯乙烯（St）的原位聚合对微米级羟基磷灰石（HA）颗粒表面进行改性，然后与HIPS复合。研究了HA表面改性对HIPS/HA复合材料形态和机械性能的影响。结果表明，HA颗粒不抑制St的聚合。通过St的原位聚合包覆在HA表面的PS链段增强了HA与HIPS之间的相容性，改善了HA颗粒在HIPS基体中的分散性，并增强了HA与基体之间的界面附着力。从而，HIPS/HA复合材料的硬度、拉伸强度和缺口冲击强度同时得到提高。并且HA表面PS的涂层厚度存在一个临界值，以实现HIPS/HA复合材料的最佳机械性能。
