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为了制备出一种可用于长段承重骨的修复、具有优异力学性能的复合材料,利用含量为30wt%和45wt%的石英纤维(QF)分别增强聚酰胺46(PA46),挤塑得到QF/PA46复合材料。采用燃烧实验、FTIR、XRD、SEM及DSC等对复合材料的结构、界面、力学性能和非等温结晶行为进行研究。结果表明:QF在复合材料中分布均匀且没有明显的取向,QF与PA46基体之间形成了氢键的结合;材料的结晶度随着QF含量的增加而降低,QF的加入提高了PA46的结晶速率,起到了异相成核剂作用,但是QF与PA46间的界面作用阻碍了PA46分子的有序排列,降低了结晶度;随着降温速率的增加,PA46和QF/PA46复合材料的结晶峰都从高温向低温方向移动,结晶的范围随降温速率的增加而变宽。力学性能测试结果表明:随着QF含量的增加,QF/PA46复合材料的拉伸强度和弯曲强度都显著增加,且与人体自体骨组织的力学强度相接近。复合材料的细胞实验结果(采用L929成纤维细胞)表明:2种QF含量的QF/PA46复合材料细胞毒性为1级,具有较好的生物安全性。QF/PA46复合材料可以应用于临床的长承载骨修复等相关领域。
In order to prepare a composite material with excellent mechanical properties that can be used for the repair of long-term load-bearing bones, polyamide 46 (PA46) was reinforced with 30% and 45% by weight silica fibers (QF) respectively and extruded to obtain QF / PA46 composite material. The structure, interface, mechanical properties and non-isothermal crystallization behavior of the composites were studied by means of combustion experiments, FTIR, XRD, SEM and DSC. The results show that QF distributes uniformly and has no obvious orientation in the composites, and the hydrogen bonds are formed between the QF and the PA46 matrix. The crystallinity decreases with the increase of QF content. The addition of QF increases the crystallization of PA46 Rate, played the role of heterogeneous nucleating agent, but the interface between QF and PA46 impede the orderly arrangement of PA46 molecules, reducing the crystallinity; with the cooling rate increases, PA46 and QF / PA46 composite peak crystallization All move from high temperature to low temperature, and the range of crystallization widens with the decrease of cooling rate. The mechanical properties of the QF / PA46 composites show that with the increase of QF content, the tensile strength and flexural strength of QF / PA46 composites increase significantly, and the mechanical strength of QF / PA46 composites is similar to that of human autogenous bone. The experimental results of the composite materials (using L929 fibroblasts) showed that the QF / PA46 composite with two QF contents had a level 1 cytotoxicity and had good biosafety. QF / PA46 composite materials can be used in clinical long-term bearing bone repair and other related fields.