화학공학소재연구정보센터
Journal of Polymer Science Part A: Polymer Chemistry, Vol.52, No.6, 857-866, 2014
Synthesis of Cyclic Polysulfides: Controlled Ring-Expansion Polymerization of Cyclic Tetrathioester with Thiirane
We synthesized cyclic tetrathioesters containing thioester moieties at the o-position (o-CTE) and m-position (m-CTE) of an aromatic skeleton. The reaction of phenoxy propylenesulfide (PPS) with o-CTE and m-CTE was examined using tetrabutylammonium chloride as a catalyst in 1-methyl-2-pyrrolidinone, yielding the corresponding cyclic polysulfides poly[o-CTE(PPS)(n)] with M-n's=37,000-54,000 at 34-61% yields and poly[m-CTE(PPS)(n)] with M-n's=46,600-107,200 at 63->99% yields. Although the molecular weights of poly[o-CTE(PPS)(n)] could not be controlled, those of poly[m-CTE(PPS)(n)] could be controlled by the feed ratios of PPS and reaction temperature. Furthermore, the glass transition temperature (T-g) and thermal decomposition temperature (T-d(i)) of poly[m-CTE(PPS)(n)] increased with decreasing molecular weights. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 857-866