以甲基丙烯酸甲酯(MMA)和丙烯酸甲酯(MA)为起始原料,过硫酸钾(KPS)为引发剂,1.5 wt%聚丙烯腈基碳纤维为增强相,采用悬浮聚合的方法,制备了碳纤维增强PMMA-PMA基复合材料(C_f/PMMA-PMA).研究了疲劳周期对C_f/PMMA-PMA复合材料抗弯强度的影响及其生物活性.采用X射线衍射分析(XRD)对复合材料的结构进行了表征,应用万能材料试验机测试了复合材料的抗弯强度,并利用扫描电子显微镜(SEM)对复合材料的断面显微形貌进行了分析.结果表明,在0～5000次的循环次数内,复合材料的抗弯强度没有显著变化,试样表面的受力处也没有出现裂纹等现象.随复合材料在模拟体液(SBF)中浸泡时间的延长,复合材料表面沉积的羟基磷灰石(HA)颗粒增多,说明复合材料具有良好的生物活性.此外,SBF的浸泡对C_f/PM-MA-PMA复合材料的力学性能几乎没有影响.
1.5 wt% carbon fiber (C_f) reinforced polymethyl methacrylate-polymethyl acrylate (PMMA-PMA) matrix composites were prepared by the suspension polymerization process with initiation reaction using methyl methacrylate (MMA) and methyl acrylate (MA) as raw materials, and potassium persulfate (KPS) as initiator. The effects on flexural strength and bioactivity of the prepared composites fatigue behavior were particularly investigated. The flexural strength, microstructures and phase composition of the composites were characterized by the universal testing machine, X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses, respectively. The results show that the composites flexural strength displays no clear change and there are no cracks on the stress surface of the composites within 0～5000 cycles. The deposition of the hydroxyapatite particles increases with extending soaping time of C_f/PMMA-PMA composites dipping in simulated body fluid (SBF) solution, which shows that the prepared composites have good bioactivity. In addition, there is almost no influence on the mechanical performance of the composites when they are soaped in SBF solution.
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