Preparation and characterization of quartz fiber/polyamide-46 composites
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摘要: 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。Abstract: To prepare one kind of composites with excellent mechanical properties, which would be used in long load-bearing bone repairing, different contents of quartz fiber (QF )with mass ratio of 30wt% and 45wt% were used to enhance polyamide-46 (PA46) and QF/PA46 composites were prepared by extrusion and injection molding. The structure, interface, mechanical performance and nonisothermal crystallization behavior of composites were studied by using burning test, FTIR, XRD, SEM and DSC. The results show that QF is uniformly distributed in composites and is quasi-isotropic. QF and PA46 matrix are mainly linked by hydrogen bond. The crystallinity of materials decreases with increasing QF contents. QF enhances the crystallization growth rate of PA46 and contributes to heterogeneous nucleating agent, but the interface action between QF and PA46 hinders the molecules' order arrangement, which decreases the crystallization degree. The crystallization peaks of PA46 and QF/PA46 move from higher temperature to lower with the increase of cooling rate, meanwhile, the width of crystallization peak becomes larger. The mechanical test indicates that more QF (within a certain limits) in composites leads to an increase in tensile strength and bending strength, which are close to those of the natural compact bone. The cytotoxicity test (adopting L929 fibroblast) shows that cytotoxicity level of the composites is grade 1, indicating it has a better biological safety. The QF/PA46 composites have potential application in long load-bearing bone repairing.
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Keywords:
- quartz fiber /
- polyamide-46 /
- composites /
- biomaterials /
- interface bonding
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