|
In this paper, the atom transfer radical polymerization (ATRP) and click chemistry (click chemistry) a combination of methods , prepare a clear structure , narrow molecular weight distribution (PDI lt; 1.3) and ABC triblock copolymer PNIPAM-b- the PtBMA-b-PMMAZO, by selective hydrolysis the PtBMA blocks most of t-butyl methacrylate unit converted to methacrylic acid, to give a water - soluble triblock copolymer of PNIPAM - b -PMAA - b - PMMAZO use FT-IR, 1H-NMR, GPC, UV-Vis analysis test methods such as the synthetic product structure recognized and characterization . The results show that : after hydrolysis of the triblock copolymer , the aqueous solution on the temperature , pH , light having a triple response . The critical phase transition of the polymer solution temperature (LCST) of about 43 ° C the phase transition occurs in the pH = 5-6 range ; after ultraviolet light (λ = 365nm) irradiation , the solution of the ultraviolet-visible spectra occurs at 360nm and 460nm , absorption change significantly .
|