Ye-fang TENG. Preparation of Stereospecific Polyacrylonitrile via Reversible Addition Fragmentation Chain Transfer (RAFT) Polymerization[J]. Polymer Bulletin, 2016,29(12):50-58.
Ye-fang TENG. Preparation of Stereospecific Polyacrylonitrile via Reversible Addition Fragmentation Chain Transfer (RAFT) Polymerization[J]. Polymer Bulletin, 2016,29(12):50-58. DOI: 10.14028/j.cnki.1003-3726.2016.012.008.
Stereospecific Polyacrylonitrile was prepared via reversible addition fragmentation chain transfer (RAFT) polymerization. The chain transfer agent methyl (ethoxycarbonothioyl) sulfanyl acetate (MESA) was synthesized and characterized with
1
H NMR. Polymerizations of acrylonitrile of different feeding ratio with MESA as the chain transfer agent and Ethylene carbonate as solvent were carried out at 60℃
affording polyacrylonitrile with higher molecular weight(M
n
=5.60×10
4
g/mol) and narrowerpolydispersity (PDI=1.15). The RAFT polymerizations of acrylonitrile in presence of AlCl
3
were further undertaken in order to synthesize PAN with simultaneously controlled molecular weight and tacticity. The influence of the amount of the added Lewis acids and different monomer concentration on the polymerization was studied. The addition of AlCl
3
in RAFT of acrylonitrile led to polyacrylonitrile with higher molecular weight (M
n
=6.1×10
4
~6.5×10
4
g/mol)
narrower polydispersity index(PDI=1.31~1.38)and an improved meso content (mm=32.1%~32.6%) under the optimum reaction condition used.
关键词
活性自由基聚合RAFT立构规整性聚丙烯腈
Keywords
Living radical polymerizationRAFTStereospecificPolyacrylonitrile