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Carbon fibers prepared from tailored reversible‐addition‐fragmentation transfer copolymerization‐derived poly(acrylonitrile)‐ co ‐poly(methylmethacrylate)

Authors :
Alexandra Müller
Antje Ota
Ronald Beyer
Frank Hermanutz
Johanna M. Spörl
Thomas Lehr
Michael R. Buchmeiser
Source :
Journal of Polymer Science Part A: Polymer Chemistry. 52:1322-1333
Publication Year :
2014
Publisher :
Wiley, 2014.

Abstract

Reversible-addition fragmentation-transfer (RAFT) polymerization of acrylonitrile (AN) was performed with 2-(2- cyano-2-propyl-dodecyl)trithiocarbonate as RAFT agent and azobis(isobutyronitrile) as initiator. Linear polyacrylonitrile (Mn 5 133,000 g/mol, PDI 5 1.34) was prepared within 7 h in 86% isolated yield. High-yield copolymerization with methyl methacrylate (MMA) was performed and copolymerization parameters were determined according to Kelen and T€ ud€ os at 90 � C in ethylene carbonate yielding rAN 5 0.2 and rMMA 5 0.42. The molecular weights, polydispersity indices (PDIs), and MMA content of the copolymer were adjusted in a way that precur- sor fibers could be prepared via wet spinning. These precursor fibers had round cross-sections and a dense morphology, showing tenacities of 40-50 cN/tex and elastic moduli of 900- 1000 cN/tex at a fineness of 1 dtex and an elongation of 13- 17%. Precursor fibers were oxidatively stabilized and then car- bonized at different temperatures. A maximum tensile strength of 2.5 GPa was reached at 1350 � C. Thermal analysis, infrared and Raman spectroscopy, wide-angle X-ray scatter- ing, scanning electron microscopy, and tensile testing were used to characterize the resulting carbon fibers. V C 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 1322-1333

Details

ISSN :
10990518 and 0887624X
Volume :
52
Database :
OpenAIRE
Journal :
Journal of Polymer Science Part A: Polymer Chemistry
Accession number :
edsair.doi...........59e26316d2d7766bd2b35073e6ff7b3c
Full Text :
https://doi.org/10.1002/pola.27121