Alternating and regioregular copolymers with high refractive index from COS and biomass-derived epoxides
作者：Lan-Fang Hu, Yang Li, Bin Liu, Ying-Ying Zhang and Xing-Hong Zhang
關鍵字：carbonyl sulfide ，EGE，GGE，
論文來源：期刊
具體來源：RSC Adv., 2017, 7, 49490–49497
發表時間：2017年
This study describes the catalytic formation of alternating and regioregular copolymers from carbonyl sulfide (COS) and epoxides along with eugenol-based glycidyl ether (EGE) and guaiacol-based glycidyl ether (GGE), derived from eugenol and guaiacol, respectively. The (salen)CrCl [salen ? N,N0-bis(salicylidene) cyclohexanediimine] complex, accompanied with various organic bases, was highly active towards the EGE/COS, GGE/COS copolymerization and EGE/GGE/COS terpolymerization. The turnover of frequency (TOF) of the (salen)CrCl complex for the EGE/COS copolymerization was up to 12 000 h1. The number-average molecular weight (Mn) of the resultant EGE/COS copolymer was up to 62.2 kg mol1. In the presence of 0.5–1.5 mol% chlorohydrin, which was a by-product of the synthetic process of EGE, a-Cl, u-OH EGE/COS copolymers were obtained. This result suggests that chlorohydrin
could act as a very efficient chain transfer agent for the copolymerization. The EGE/COS, GGE/COS, and EGE/GGE/COS copolymers were soluble in most of the common solvents and exhibited a high refractive index of more than 1.58 with high Abbe numbers of up to 40.4. This study provides an unprecedented and sustainable synthetic route for making soluble sulfur-rich polymers with high optical properties.