In this work we report the synthesis of thermo-, oxidation- and cyclodextrin- (CD) responsive end-group-functionalized polymers, based on N,N-diethylacrylamide (DEAAm). In a classical free-radical chain transfer polymerization, using thiol-functionalized 4-alkylphenols, namely 3-(4-(1,1-dimethylethan-1-yl)phenoxy)propane-1-thiol and 3-(4-(2,4,4-trimethylpentan-2-yl)phenoxy)propane-1-thiol, poly(N,N-diethylacrylamide) (PDEAAm) with well-defined hydrophobic end-groups is obtained. These end-group-functionalized polymers show different cloud point values, depending on the degree of polymerization and the presence of randomly methylated β-cyclodextrin (RAMEB-CD). Additionally, the influence of the oxidation of the incorporated thioether linkages on the cloud point is investigated. The resulting hydrophilic sulfoxides show higher cloud point values for the lower critical solution temperature (LCST). A high degree of functionalization is supported by 1H NMR-, SEC-, FTIR- and MALDI–TOF measurements.
在这项工作中,我们报道了基于N,N-二乙基丙烯酰胺(DEAAm)合成的热响应、氧化响应和环糊精(CD)响应末端基团官能化聚合物。在经典的自由基链转移聚合过程中,使用巯基官能化的4-烷基酚,即3-(4-(1,1-二甲基乙烷-1-基)苯氧基)丙烷-1-硫醇和3-(4-(2,4,4-三甲基戊烷-2-基)苯氧基)丙烷-1-硫醇,得到具有明确定义的疏水末端基团的聚(N,N-二乙基丙烯酰胺)(PDEAAm)。这些末端基团官能化聚合物显示不同的云点值,取决于聚合度和随机甲基化的β-环糊精(RAMEB-CD)的存在。此外,还研究了含硫醚键的氧化对云点的影响。结果表明,亲水磺氧化物在临界溶液温度(LCST)下显示更高的云点值。通过1H NMR、SEC、FTIR和MALDI-TOF测量证实了高度官能化。