采用卵磷脂作为乳化剂,在氯仿-水所形成的乳液中制备纳米羟基磷灰石(HA)晶粒,并研究了卵磷脂对HA在氯仿中分散性的影响。FTIR及TEM分析结果表明,卵磷脂能吸附在HA晶粒表面,起着表面改性作用。通过分液除去水分后,HA仍能均匀地分散于氯仿中,没有产生团聚。因而,通过该法能制备出颗粒度在100nm左右、分散性好、能稳定存在的HA的氯仿悬浮液。在该悬浮液中加入聚甲基丙烯酸甲酯(PMMA)能形成HA/PMMA复合材料,并且HA晶粒在基体中分散均匀。因此,本文的制备方法对于制备具有良好两相分布形貌和具有高强力学性能的有机无机复合材料有着重要意义。
Ultrafine hydroxyapatite (HA) particles were prepared in the emulsion of chloroform and water
with lecithin as the emulsifier, and the effect of lecithin on the dispersion of HA particles in chloroform was explored. FTIR and
TEM analysis show that lecithin can attach on the surface of HA particles, greatly improves their dispersion in chloroform after demulsification.
Therefore, a suspension of nano-sized HA particles with excellent dispersion in organic media can be prepared with this method.
When compounded with PMMA, the HA particles can be distribute homogeneously in the PMMA matrix. The results suggest that the suspension is significant to achieve a
desirable composite microstructure during the preparation of HA-reinforced composites.
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