Surface Modification of Hydroxyapatite and Its Effect on Polycitrate Ester Based Composites
Nano hydroxyapatite(n-HA)was modified by tannic acid(TA)and citric acid(CA)to obtain modified particles THA and CHA,and then mixed with polycitrate 1,8 octane diol(POC)prepolymer in ethanol,POC/m-HA(m-HA refers to n-HA,CHA and THA)complex was obtained by drying and vacuum thermocuring.The results show that the tensile strength of m-HA/POC composites are(3.02±0.13),(4.42±0.26)MPa,and Young′s modulus are(5.12±0.81),(9.37±0.55)MPa,respectively,which are higher than(1.67±0.10)MPa and(2.96±0.12)MPa of POC elastomers.The tensile strength and Young′s modulus of THA/POC are higher than those of n-HA/POC and CHA/POC composites.The 72 h swelling degree of m-HA/POC were 10.34%±2.52%,15.69%±0.75%,and sol content were 2.17%±0.08%,4.28%±0.08%,respectively,which are lower than 18.26%±0.33%and 12.01%±1.24%of POC.The addition of n-HA has little effect on the hydrophilicity of POC,and THA particles increases the hydrophilicity of POC,while CHA particles decreases the hydrophilicity of POC.
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