Microstructures and mechanical properties of aligned electrospun carbon nanofibers from binary composites of polyacrylonitrile and polyamic acid
Microstructures and mechanical properties of aligned electrospun carbon nanofibers from binary composites of polyacrylonitrile and polyamic acid
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聚丙烯腈和聚酰胺酸二元复合材料定向静电纺碳纳米纤维的微观结构和机械性能
DOI：
10.1007/s10853-018-2700-y
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发表时间：
2018-11-01
影响因子：
4.5
通讯作者：
Hou, Haoqing
中科院分区：
文献类型：
--
作者：
Duan, Gaigai;Fang, Hong;Hou, Haoqing
碳纳米纤维增强复合材料对碳纳米纤维的力学性能提出了很高的要求，有必要开发新型的碳纳米纤维前驱体来制备碳纳米纤维。本工作将聚(丙烯腈-丙烯酸丁酯-衣康酸单丁酯)(co-PAN)与聚酰胺酸(PAA)共混电纺丝成取向纳米纤维，并通过热亚胺化、预氧化和高温碳化将纳米纤维转变为碳纳米纤维。采用傅立叶变换红外光谱对预氧化前后纳米纤维的化学结构进行了表征。采用拉伸试验对电纺碳纳米纤维的力学性能进行了表征。利用高分辨透射电子显微镜和拉曼光谱对ECNF的微观结构进行了研究。结果表明，当Co-PAN/PAA的摩尔比为6/4，炭化温度为1400℃时，所得ECNF的拉伸强度最高，为1212 Mpa，这与ECNF中有序的石墨化结构有关。
High mechanical performance carbon nanofibers are highly required for the carbon nanofiber-reinforced composites, and it is necessary to develop novel precursors for the preparation of carbon nanofibers. In this work, blends of poly(acrylonitrile-butyl acrylate mono-butyl itaconate) (co-PAN) and polyamic acid (PAA) were electrospun into aligned nanofibers and the nanofibers were converted to carbon nanofibers by thermal imidization, pre-oxidation and high-temperature carbonization. FT-IR spectroscopy was applied to monitor the chemical structures of the nanofibers before and after pre-oxidation. Tensile tests were used to characterize the mechanical properties of electrospun carbon nanofibers (ECNFs). The microstructures of ECNFs were investigated by high-resolution TEM and Raman spectroscopy. The results indicated that the ECNFs derived from blend of co-PAN/PAA with molar ratio of 6/4 and with carbonization temperature of 1400 °C possessed the highest tensile strength of 1212 MPa, which could be attributed to the ordered graphitic structures in ECNFs.