Huang Yi, Fan Xiaodong, Hu Hui
(Department of Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072)

Abstract A novel b-cyclodextrin (b-CD) containing linear polymer (PDMA-b-CD) which has both thermo- and pH-sensitives was synthesized by quaternization of N,N-dimethylaminoethyl methacrylate(DMA) using iodide substituted b-CD as quaternizing agent. The polymer was characterized by FT-IR, ¹H NMR and element analysis. The aqueous solubility experiments show that the polymer with 30.43(wt)% b-CD still exhibits pH-, ionic strength-and thermo-sensitivities. However, due to the introduction of hydroxyl groups in b-CD, and quaternizing tertiary amine groups, the aqueous solubility behavior of novel polymer synthesized, in response to the external stimuli, was much weaker than that of PDMA. The inclusion property of PDMA-b-CD was confirmed by the method of UV-vis spectrophotometric titration using phenolphthalein as probe.
Key words b-Cyclodextrin, N,N-Dimethylaminoethyl methacrylate, Thermo- and pH-sensitive properties, Inclusion