Molecular-Recognition Characteristics of Thermo-Responsive Polymers with Pendent Beta-Cyclodextrin Groups
Two poly(N-isopropylacrylamide) (PNIPAM) based thermo-responsive polymers with pendent beta-cyclodextrin (β -CD) groups (poly(N-isopropylacrylamide-co-glycidyl methacrylate) -mono-6-deoxy-6-ethylene diamino-β -CD, PNG-ECD, and poly(N-isopropylacrylamide-co-glycidyl methacrylate)-mono-6-deoxy-6-hexane diamino-β -CD, PNG-HCD) were synthesized and effects of the concentration of guest molecules (8-anilino-1-naphthalenesulfonic acid ammonium salt, ANS, and 2-naphthalenesulfonic acid, NS) on the lower critical solution temperature (LCST) and the phase transition behaviors of thermo-responsive polymers were investigated. The results showed that the thermo-sensitive PNG-ECD and PNG-HCD polymers could significantly recognize the guest ANS molecules, and the LCSTs of them in the ANS aqueous solutions were lower than that in blank aqueous solution because of the hydrophobic phenyl group of ANS out of the cavity after the CD/ANS complexation. The more the ANS recognized by the polymer, the lower the polymer’s LCST became. However, the guest NS molecules had an opposite influence on the LCSTs of PNG-ECD and PNG-HCD polymers, because the complexation between CD and NS slightly enlarged the hydrophilic moiety of polymers due to the dissociation of NS molecules in the water.
thermo-responsive polymer phase transition host/guest systems molecular recognition lower critical solution temperature
YANG Mei CHU Liangyin XIE Rui WANG Chun
School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
国际会议
第四届中日化工学术研讨会(The 4th Joint China/Japan Chemical Engineering Symposium)(CJCES)
成都
英文
2007-12-19（万方平台首次上网日期，不代表论文的发表时间）