文献类型：期刊文献

英文题名：A synthetic strategy toward isosorbide polycarbonate with a high molecular weight: the effect of intermolecular hydrogen bonding between isosorbide and metal chlorides

作者：Zhang, Ming[1];Lai, Wenqin[1];Su, Lili[1];Lin, Yu[1];Wu, Guozhang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2019

卷号：10

期号：24

起止页码：3380

外文期刊名：POLYMER CHEMISTRY

收录：;EI(收录号：20192507081375);WOS:【SCI-EXPANDED(收录号:WOS:000471906900012)】；

基金：This work was financially supported by the National Nature Science Foundation of China (51873063) and the National Basic Research Program of China (2013CB035505).

语种：英文

外文关键词：Molecular weight - Catalysts - Polycarbonates - Alkali metals - Hydrogen

摘要：Isosorbide polycarbonate (ISB-PC) was prepared by melt transesterification and polycondensation reaction by employing ISB and diphenyl carbonate (DPC) as monomers. The effects of catalyst on the reactivity and the reactivity disparity of two hydroxyl groups (endo-OH and exo-OH) on ISB were investigated. The result shows that a metal chloride can form intermolecular hydrogen bonding with ISB hydroxyl groups, and the ISB intramolecular hydrogen bonding facilitates a stronger intermolecular hydrogen bonding between endo-OH and the catalyst. The intermolecular hydrogen bonding is capable of improving preferentially the endo-OH reactivity and thus increases the content of the endo-endo (a(1)) structure on the ISB-PC chain, resulting in a high T-g of the product. Further balancing of the reactivity disparity between endo-OH and exo-OH can be achieved by adjusting log beta(1) of the alkali metal chloride. It is found that the lithium chloride (LiCl) catalyst can significantly reduce the reactivity disparity, and the viscosity-average molecular weight of the synthesized ISB-PC reaches 51 000 g mol(-1).