新型聚酰亚胺碳纤维复合树脂桩钉材料的研制

Development of novel polyimide composite core materials reinforced with carbon fiber

目的:研究碳纤维增强聚酰亚胺树脂的机械性能、生物安全性;探索复合树脂桩钉材料的成型方法。方法:用缠绕法制得单向预浸布料,热压成型制作单向聚酰亚胺/碳纤维复合层压板复合材料,并测试其弯曲强度、弹性模量。采用机械加工方法根据尺寸要求制备桩钉材料。并采用MTT法进行生物学评价。结果:复合材料的弯曲强度比金属材料明显提高,弹性模量更接近于天然牙根的弹性模量(其中复合材料弯曲强度在1160-1550MPa之间,弹性模量在6.4-8.8GPa之间)。细胞毒性均为1级,溶血率小于均5%。结论:连续碳纤维增强聚酰亚胺树脂复合材料,具有优良的机械性能及良好的生物相容性和生物安全性,可以满足临床需要。

Objective： To study the mechanical property and biological security ofpolyimide （PI） based composites resin reinforced by high-strength carbon fiber （CF）, and to explore the proper method of producing composite resin post materials. Methods： Unilateralism cloth irrigated in advance made by enlace method, Unilateralism carbon fiber（CF） / polyimide （PI） composite composed by heat press molding. The mechanical properties of CF/PI composites resin were investigated including bending strength, elastic modulus. Post material was prepared in size with machining and the biological performance was evaluated with MTT. Results： Compared with metal post, bending strength of the CF/PI composites increased markedly. And elastic modulus of CF/PI composites was similar to root of nature tooth （bending strength between in 1160-1550 MPa, elastic modulus between in 6.4-8.8GPa）. The cytotoxicity of CF/PI composites was grade 1 and the hemolysis rates were less then 5%. Conclusion： The novel polyimides based composites reinforced by the carbon fiber have good mechanical property and biological performance which could be used in clinic successfully in the future.