摘要
为了得到结构确定的β-环糊精大单体并用于超支化聚合,通过对β-环糊精上6位伯羟基和2位仲羟基的多步功能化改性得到了同时含有Si—H和—CH CH2基团的AB2型β-环糊精大单体,并利用硅氢加成反应一步法合成了一种新型的水溶性超支化聚合物,其具有β-环糊精空腔和超支化空穴两种疏水单元,从而可构建出一种新颖的超分子体系.采用1H-NMR、13C-NMR、飞行时间质谱和元素分析对AB2单体及其聚合物的结构进行了表征.结果表明,单体和聚合物的结构与所设计的分子结构相符合.凝胶渗透色谱/多角度激光光散射(SEC/MALLS)联用仪测得该聚合物的数均分子量、分子量分布及特性黏数分别为36690、1.887和15.8mL/g.
To obtain well-defined structures of a β-cyclodextrin based monomer and its hyperbranehed polymer, an AB2 type monomer carrying Si-H and --CH= CH2 groups was first synthesized via modification of C-2 and C-6 hydroxyl groups in β-cyclodextrin, respectively. And then, the water-soluble hyperbranched polymer was prepared via hydrosilylation using N, N-dimethylformamide as the solvent and H2PtC16 as the catalyst at 100℃. The molecular structures for both monomer and polymer were characterized by 1 H-NMR, ^13 C-NMR, MALDI-TOF MS and elemental analysis. It was found that the actual molecular structures for both monomer and polymer were identical with the designed structures, and there also existed a hydrosilylation and β hydrosilylation during polymerization, as a result, the hyperbranched polymer possesses a large amount of functional vinyl bonds around its end chains. The polymer synthesized is soluble in tetrahydrofuran slightly and insoluble in nonpolar solvents such as hexane. The molecular weight, molecular weight distribution and intrinsic viscosity of the polymer were measured as 36690,1. 887 and 15.8 mL/g, respectively by using size exclusion chromatography/multi-angle laser light scattering （SEC/MALLS） instrument. Due to two different cavities which are from β-cyclodextrin and the hyperbranched polymer, a possible novel spuramolecular system which may capsulize two more different molecules in a single polymer can be constructed.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2008年第10期1020-1024,共5页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号20674060)
陕西省自然科学基础研究计划(项目号2007B16)资助项目
