碳纳米纤维增强聚甲醛复合材料制备及性能

通过纳米碳纤维(CNFs)在聚甲醛(POM)基体中的均匀分散以及取向,制备了具有优异力学性能和热性能的POM/CNFs复合材料。利用扫描电子显微镜、透射电子显微镜、拉伸性能测试、热重分析、动态热机械分析测试表征了POM/CNFs复合材料的结构和力学、热学性能。结果表明,CNFs与POM分子链形成氢键相互作用,促进了CNFs在POM基体内分散,同时使POM/CNFs复合材料的结晶度显著提高。随着CNFs含量增加,POM/CNFs复合材料的拉伸强度、储能模量和损耗模量均得到提高。当添加0.5%的CNFs时,拉伸强度、储能模量及损耗模量分别提高了20.5%,127%和58%。进一步研究了高温拉伸对POM/CNFs复合材料性能的影响。结果表明,CNFs沿拉伸方向定向排列,同时复合材料拉伸后结晶度提高,拉伸强度显著增加。

Preparation and Properties of Reinforcing Polyoxymethylene Composites with Aligned Carbon Nanofibers

Polyoxymethylene(POM)/carbon nanofibers(CNFs)composites with excellent mechanical and thermal properties were prepared by uniform dispersion and orientation of CNFs in POM matrix.The structure,mechanical and thermal properties of POM/CNFs composites were characterized by scanning electron microscope,transmission electron microscope,tensile test,thermogravimetric analysis and dynamic thermomechanical analysis.The results show that the hydrogen bond interaction between CNFs and POM molecular chains promotes the dispersion of CNFs in POM matrix,and the crystallinity of POM/CNFs composites is significantly improved.With the increase of CNFs content,the tensile strength,storage modulus and loss modulus of POM/CNFs composites are improved.When 0.5%CNFs is added,the tensile strength,storage modulus and loss modulus are increased by 20.5%,127%and 58%,respectively.The effect of high temperature tension on the properties of POM/CNFs composites was further studied.The results show that the crystallinity and the tensile strength of POM/CNFs composites increase with the orientation of CNFs.