Synthesis of Polyacrylonitrile (PAN) Copolymer via Reversible Addition-Fragmentation Chain Transfer (RAFT) Polymerization
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초록
내용
Polyacrylonitrile (PAN) has been used as a precursor for carbon fibers, which are promising materials for industrial scale light-weight composite fabricating. The molecular weight distribution affects the mechanical properties of PAN, and a decrease in the polydispersity index improves the mechanical performance of the PAN. Therefore, the reversible addition-fragmentation chain transfer (RAFT) polymerization method was used to control the polydispersity index. In addition, PAN homopolymer has low solubility in the spinning due to strong intermolecular interactions and many defects such as voids by the intense heat release. To overcome these limitations, we introduced neutral comonomners and acidic comonomers into the PAN chains. In this work, Polyacrylonitrile mediated by 2-cyano-2-propyl benzodithioate was obtained via RAFT polymerization. PAN copolymers were analyzed by FT-IR, NMR, DSC, TGA.