Influence of End Groups on the Stimulus-Responsive Behavior of Poly[oligo(ethylene glycol) methacrylate] in Water
作者:Peter J. Roth、Florian D. Jochum、F. Romina Forst、Rudolf Zentel、Patrick Theato
DOI:10.1021/ma1005759
日期:2010.5.25
thiosulfonates. As end groups, n-propyl, n-hexadecyl, di(n-octadecyl), poly(ethylene glycol)-550 (PEG), 1H,1H-perfluorononyl, azobenzene, and trimethylethylammonium groups were systematically combined with methyl, n-hexadecyl, and 1H,1H,2H,2H-perfluorooctyl groups. Polymers were characterized by gel permeation chromatography, dynamic light scattering, and turbidimetry. Hydrophobic end groups at either end of the
系统地研究了两个端基的化学结构对水中聚[低聚(乙二醇)单甲基醚甲基丙烯酸酯](POEGMA)的下临界溶液温度(LCST)的影响。通过可逆加成-断裂链转移(RAFT)聚合制备的M n = 3550 g / mol和M w / M n = 1.14的POEGMA在一步聚合后的反应中,将活化的酯和官能胺结合在一起,具有两个不同的官能端基,以及功能性甲烷硫代磺酸盐。作为端基,正丙基,正十六烷基,二(正十八烷基),聚(乙二醇)-550(PEG),1 H,1H-全氟壬基,偶氮苯和三甲基乙基铵基与甲基,正十六烷基和1 H,1 H,2 H,2 H系统结合-全氟辛基。通过凝胶渗透色谱,动态光散射和比浊法表征聚合物。聚合物链两端的疏水端基降低了LCST。对于链两端的疏水基团,它们的影响是累加的。两个较大的疏水端基允许在LCST以下形成胶束,而LCST高于未聚集聚合物所预期的胶束。发现刚性芳族端基的疏水作用最强