硬脂酸改性纳米羟基磷灰石表面性能的研究

采用硬脂酸(C₁₇H₃₅COOH)对纳米羟基磷灰石(n-HA)表面进行处理，并研究了n-HA与C₁₇H₃₅COOH的界面作用。透射电子显微镜(TEM)、傅立叶红外光谱(FTIR)以及X光电子能谱(XPS)分析表明，C₁₇H₃₅COOH在n-HA表面黏附，其中羧酸根离子(-COO^-)与钙离子(Ca^2＋)之间形成了稳定的离子键，以羧酸钙形式存在。C₁₇H₃₅COOH改性后的n-HA与聚碳酸酯(PC)复合后，复合材料的力学性能与未改性n-HA相比有明显提高。扫描电子显微镜(SEM)结果显示，经处理后的HA微粒在PC中分散均匀，两者间结合紧密，无明显界面，复合材料的断裂呈明显的韧性断裂，随着n-HA无机粒子含量增加，复合材料的断裂也逐渐向韧性与脆性断裂共存转变。

Surface Modification of Nano-Hydroxyapatite with Stearic Acid

In this paper, nano-hydroxyapatite(n-HA) was modified using stearic acid(C₁₇H₃₅COOH), and the interfac-ial interactions between n-HA and C₁₇H₃₅COOH was also studied. Transmission electron microscopy(TEM), Fourier transform infrared spectra(FTIR) and X-ray photoelectron spectra(XPS) analyses showed that the stearic acid molecular binded strongly to n-HA surface. Ionic bond was formed by the reaction between Ca²⁺ and C₁₇H₃₅COO^- group. Surface modification of HA particles could improve the mechanical strengths of the n-HA/polycarbonate(n-HA/PC) composites dramatically. SEM observation showed that HA particles uniformly distributed in the PC matrix, both unifies closely, the not obvious interphase boundary, the composite materials break showed the obvious ductile fracture, increases along with the n-HA inorganic granule content, composite materials break also gradually to ductile and brittle fracture coexistence transformation, indicating that the interfacial interaction between surface-modified inorganic particles and polymer matrix is crucial for the increase of the mechanical strength of the composite.