A New Thermo-, pH-, and CO2-Responsive Homopolymer of Poly[N-[2-(diethylamino)ethyl]acrylamide]: Is the Diethylamino Group Underestimated?

• DOI: 10.1021/acs.macromol.5b02458
• Publication Date: 2015-12-31T14:36:28Z
• Authors: Zefeng Song; Ke Wang; Chengqiang Gao; Shuang Wang; Wangqing Zhang
• Keywords: Molar mass distribution

A new multi-stimuli-responsive homopolymer of poly[N-[2-(diethylamino)ethyl]acrylamide] (PDEAEAM), which combines the thermoresponsive and pH/CO2-responsive moieties diethylamino acrylamide groups, was proposed synthesized by RAFT polymerization. Well-defined PDEAEAM solution polymerization as indicated linear increase in polymer molecular weight with monomer conversion narrow distribution. The appending group backbone found to be crucial determine thermoresponse water. parameters including degree, concentration, deuterated solvent, terminal attached on backbone, additives salt urea, pH bubbling CO2 affecting aqueous at lower critical temperature (LCST) were investigated. temperature-variable 1H NMR analysis suggests that dehydration above LCST is ascribed weakened hydrogen bonding between CONHCH2 and/or (CH2N(CH2CH3)2) solvent has two advantages (1) convenient controllable synthesis (2) pH/CO2 tunable ∼36 °C being very close body temperature.