~1H NMR研究β—环糊精与环氧氯丙烷共聚物的反应机理和分子链结构  

STUDY ON COPOLYMERIZATION MECHANISM AND MOLECULAR CHAIN STRUCTURE OF COPOLYMERS OF β-CYCLODEXTRIN WITH EPICHLOROHYDRIN BY ~1H NMR

作　　者：杜定准[1] 汪月生 徐文英[1] 

机构地区：[1]中国科技大学材料科学与工程系,合肥230026

出　　处：《波谱学杂志》1992年第2期121-129,共9页Chinese Journal of Magnetic Resonance

基　　金：中国科学院武汉物理研究所波谱;原子分子物理国家重点实验室资助课题

摘　　要：β-环糊精(cyclodcxtrin)与环氧氯丙烷(Epichlorohydrin)一个系列的共聚物获得,~1HNMR以D_2O或DMSO-d_6为溶剂的测定,其谱峰被归属.共聚合反应机理为以羟基和环氧基为活性中心的亲核取代.当环氧氯丙烷:β-环糊精=n≤3时,聚合物分子链呈现以β-环糊精母体为中心的线状或低枝化状链结构;当n≥5时,分子链出现交联网络结构.n越大(n≤12),分子量越急剧增加,其交联度也越大.A series of copolymcrs of β-Cyclodextrin (β-CD) with Epichlorohydrin (EP) was determined by means of 1H NMR in D2O or DMSO-d6 at 60,300 and 400 MHz , and their spectral assignments were given out. Copolymerization mechanism could be ascribed to a nucleophilic addition of hydroxyl group to epoxy group as an active centre. When EP:β - CD = n≤3,the copolymeric molecular chains showed linear or branched structure at β-CD matrix; n≥5, crosslinking network appeared in the chains. The larger n value (here, n≤12), the larger M. W., and the higher crosslinking degree.

关 键 词：环糊精 共聚物 NMR 分子链结构 

分 类 号：O631.12[理学—高分子化学]