表面改性对Cf/HA-PMMA混杂生物复合材料的结构及性能的影响
详细信息Influence of surface modification on microstructure and properties of Cf/HA-PMMA hybrid bio-composites
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摘要: 采用原位合成与溶液共混相结合的方法，制备了短切碳纤维(Cf) 增强纳米羟基磷灰石(HA)-聚甲基丙烯酸甲酯(PMMA)生物复合材料。重点研究了短切碳纤维和纳米HA粒子表面改性前后对Cf/HA-PMMA复合材料微观结构和力学性能的影响。采用XRD、FTIR、XPS和SEM等对纳米HA粒子、碳纤维和复合材料的组成结构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弯曲、压缩性能。结果表明：经表面氧化的碳纤维和用卵磷脂改性后的纳米HA与PMMA基体的界面结合性明显得到改善；采用卵磷脂表面改性后的纳米HA及表面预氧化后的碳纤维制备的Cf/HA-PMMA复合材料的弯曲性能得到显著提高，与采用未表面改性纳米HA和未表面氧化碳纤维所制备的Cf/HA-PMMA复合材料相比，弯曲、压缩强度和弹性模量分别提高1.6倍、2倍和4.3倍。Abstract: Short carbon fiber (Cf) reinforced nano-hydroxyapatite (HA)-poly (methyl methacrylate) (PMMA) hybrid bio-composites were prepared by an in-situ processing and solution co-mixing process. The influences of surface modification of carbon fibers and nano-HA on the microstructures and mechanical properties of the Cf/HA-PMMA composites were investigated. The structures and fracture surface morphologies of nano-HA，carbon fiber and the composites were characterized by XRD，FTIR，XPS and SEM analyses. The flexural and compressive properties of the Cf/HA-PMMA composites were tested by a universal testing machine. The results show that the interfacial combination between the surface modified-HA particles by lecithin or pre-oxidized carbon fibers by nitric acid and PMMA matrix is evidently improved. Flexural properties of as-prepared Cf/HA-PMMA composites with the surface modification of HA particles and carbon fiber are obviously increased. Compared with the Cf/HA-PMMA composites using unmodified-HA particles and untreated-carbon fiber，the flexural strength，compressive strength and elastic modulus of modified composites increase 1.6 times，2 times and 4.3 times，respectively.
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