Evolution of the interactions between components during the coagulation of polyacrylonitrile solution
HUA Lu;ZHANG Qi;WANG ZhongZe;LI Ting;XU LiangHua
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National Carbon Fiber Engineering Technology Research Center, College of Materials Science and Engineering,Beijing University of Chemical Technology, Beijing 100029, China
The coagulation of polyacrylonitrile (PAN) solution in dimethyl sulfoxide (DMSO) by ethylene glycol (EG) has been studied by attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy. The spectra were treated by a two-dimensional correlation analysis method to resolve the overlapping bands and determine the relationships between specific bands. The evolution of intramolecular interactions and interactions in the PAN-DMSO-EG mixture can explain the mechanism of coagulation in molecular terms. The results showed that DMSO aggregates which exist in the PAN solution and interact with —CN moieties, became more weakly bound after addition of EG and diffusion began. DMSO was gradually expelled from the inner polymer chains as the process proceeded. Solidification eventually took place when PAN chains began to aggregate together via the interaction between —CN groups.
HUA Lu;ZHANG Qi;WANG ZhongZe;LI Ting;XU LiangHua.
Evolution of the interactions between components during the coagulation of polyacrylonitrile solution[J]. Journal of Beijing University of Chemical Technology, 2014, 41(6): 69-74
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