The surfaces of the micron-sized HA particles were modified by in situ copolymerization of vinyl triethoxyl silane (VTES) and styrene (St). Then, the modified HA particles were compounded with HIPS. The results showed that the polystyrene (PS) macromolecules were grafted on the surfaces of HA particles during in situ copolymerization of VTES and St. Thereby, PS chains grafted on the HA surface enhance the compatibility between HA and HIPS, improve the dispersion of HA particles in HIPS matrix, and enhance the interfacial adhesion between HA and matrix. 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 to the HA surf ace for the optimum mechanical properties of HIPS/HA composites.
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