![]() Therefore, many researchers have devoted their efforts to study the mechanical performance of electrospun PAN or co-PAN nanofibers. Among these precursors, PAN and its copolymers (co-PAN) are widely investigated due to their mechanical inheritance to CNFs. CNFs can be simply produced by electrospinning followed by thermal treatments from different kinds of polymer precursors, such as polyacrylonitrile (PAN) and its copolymers ( 5), ( 6), ( 7), ( 8), ( 9), poly(vinyl alcohol) (10), ( 11), polybenzimidazole (PBI) (12), ( 13), polyamic acid ( 14), ( 15), ( 16), polybisbenzimidazobenzophenanthroline-dione (BBB) (17), etc. These electrospun aligned co-PAN nanofibers could be good candidates for the preparation of high performance carbon nanofibers.Ĭarbon nanofibers (CNFs) are ideal candidates for high performance composites because of their excellent mechanical properties and thermal stabilities ( 1), ( 2), ( 3), ( 4). When the molecular weight was 2.3×10 5, the highest strength of 153 MPa, strain of 0.148, and toughness of 16.0 J/g were obtained. The results indicated that higher molecular weight led to better mechanical performance of electrospun aligned co-PAN nanofibers. Tensile tests were applied to evaluate the mechanical properties of electrospun aligned co-PAN nanofibers. All the co-PAN nanofibers showed smooth surfaces and homogeneous fiber diameters of ~450 nm. The co-PANs with different molecular weight were electrospun into aligned nanofibers by adjusting the absolute viscosity of co-PAN solution into ~1.0 Pa ![]() ![]() The effect of the initiator amount on the molecular weight of co-PAN was investigated. In this work, co-polyacrylonitriles (co-PANs) with different molecular weights were synthesized by a simple free-radical polymerization. Polyacrylonitrile (PAN) nanofibers are very important to achieve high performance carbon nanofibers. ![]()
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