G(f)/HA-CS复合材料的制备及性能研究

以羟基磷灰石-壳聚糖(HA-CS)为基体,玻璃纤维G(f)为增强相,采用原位杂化法制备短玻璃纤维增强HA-CS基生物复合材料.研究交联剂、羟基磷灰石含量和玻璃纤维含量对复合材料性能的影响.采用红外吸收光谱、扫描电子显微镜和万能材料试验机对材料的结构和性能进行表征.结果表明:原位杂化法能制备性能较好的复合材料;用戊二醛交联改性复合材料可以明显增加其韧性和弯曲强度,使复合材料抗弯曲强度提高16%;当CS/HA=10/1(质量比)和玻璃纤维含量为1.5%时复合材料抗折强度达到极大值84.47 MPa;随玻璃纤维含量的增加,复合材料的断裂面由平整向多层断裂变化,材料的韧性有所提高.

Preparation and Properties of G(f)/HA-CS Composites

Glass fiber reinforced chitosan-hydroxyapatite (HA-CS) composites (G(f)/HA-CS) were prepared by a in-situ precipitation process. The infulences of the cross linker, HA mass fraction and fiber mass fraction on the structure and flexural strength of the composites were investigated. The structures and properties of the as-prepared composites were characterized by IR, SEM and universal test machine. The results show that the composites with good performances can be obtained by employing the in-situ hybrid process; the toughness of the composites modified by glutaric dialdehyde cross-linking can be remarkably increased, and their flexural strength can be improved by 16% to an optimum value of 84.47 MPa when the monomer ratio (CS/HA) reaches 10/1 and the fiber mass fraction reaches 1.5%. With the increase of glass fiber mass fraction, the microstructure of fractured surfaces changes from smooth to crapy. It can be infered that the toughness of the composites is improved