|Synthesis of Polycatenane by Polymerization of Cyclic Disulfides and Shape-Memory Characteristics of the Polymer
Graduate School of Engineering, Osaka City University, Sumiyoshi-ku, Osaka, Japan
Nippon Gomu Kyokaishi,(2007),80(5),191-196 General Review in Japanese
This review describes thermal polymerization of cyclic disulfides without any initiators. Cyclic disulfides such as 1,2-dithiane (DT) and 1,4-dihydro-2,3-benzodithine (XDS) can polymerize easily at reaction temperature of the melting points of the respective monomers to give a high molecular weight polymer determined by GPC. From the analyses of NMR and ESI-MS spectroscopies, the polymers obtained from the polymerization of cyclic disulfides were found to be a cyclic structure. Moreover, thermal and mechanical properties of the polymers, and decomposition behaviors of the polymers demonstrate that the polymers obtained from thermal polymerization of cyclic disulfides i nclude a polycatenane structure. From polymerization of cyclic disulfides in the presence of cyclic poly(ethylene oxide), a polycatenane consisting of two different cyclic polymer was obtained. The polymers revealed characteristics as a shape-memory material.
Cyclic Disulfides, 1,2-Dithiane, 1,4-Dihydro-2,3-benzodithine, Thermal Polymerization, Cyclic Polymer, Polycatenane, Shape-memory Material