Preparation and property of short carbon fiber reinforced HA/ PMMA bio-composites
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摘要: 以丙烯腈短切碳纤维(C)为增强相,纳米羟基磷灰石(HA)为改性体,聚甲基丙烯酸甲酯(PMMA)为基体,采用原位合成与溶液共混相结合的方法,制备了Cf-HA/PMMA生物复合材料。用X射线衍射仪(XRD)、红外吸收光谱仪(FTIR)、扫描电子显微镜(SEM)和能谱仪(EDS)等对材料的结构组成及断面的微观形貌等进行测试和表征,使用万能材料试验机测试其力学性能。结果表明:该合成工艺可以保证短切碳纤维和HA 在基体PMMA中均匀分布;所制备的复合材料具有较好的力学性能。随着碳纤维含量的增加,复合材料的弯曲强度和模量均呈先增大后减小的趋势。当碳纤维含量为4 %、HA含量为2%时(质量分数),复合材料的弯曲强度和弯曲模量达到极大值97.41 MPa和3.06 GPa。从复合材料的SEM照片可以看出,当碳纤维含量增加到6%时,纤维在基体PMMA中出现部分聚集现象。Abstract: The short carbon fiber (Cf) reinforced hydroxyapatite (HA)/poly (methyl methacrylate) (PMMA) bio-composites were prepared by an in-situ processing and solution co-mixing process. The structures and fracture surface morphologies of as-used materials were characterized using XRD,FTIR spectra,SEM and EDS analysis.The mechanical properties of the Cf-HA/ PMMA composites were tested by a universal testing machine. The results reveal that short Cf and HA nano-particles are uniformly dispersed in the PMMA matrix. The as-prepared Cf-HA/PMMA composites have excellent mechanical properties. With the increase of the content,the flexural strength and flexural modulus of Cf-HA/PMMA composites firstly increase to the maximum and then decrease. When Cf and HA mass fractions are 4% and 2%,respectively,the flexural strength and modulus reach the maximum values of 97.41MPa and 3.06 GPa. The SEM fracture morphologies of Cf-HA/ PMMA composites indicate that with the increase of Cf mass fraction to 6%,the aggregation of Cf in the PMMA matrix is found.
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