关键词: 原子转移自由基聚合法, 嵌段共聚物, 双重响应, 聚甲基丙烯酸, 聚N-异丙基丙烯酰胺

Abstract:

Gating membranes with grafted diblock poly(methacrylic acid)- block-poly(N-isopropylacylamide) (PMN) and poly(N-isopropylacylamide)-block-poly(methacrylic acid) (PNM) are successfully prepared via surface-initiated atom transfer radical polymerization (ATRP).The dual pH-/thermo-responsive property of these membranes are systematically investigated by buffer solution permeation experiments at different pH values and temperatures. Results indicate that the grafting yields of the first blocks grafted in the diblock polymers are always higher than those of the second ones. The responsive gating coefficients of the prepared membranes triggered by simultaneous pH and temperature stimuli are much higher than that triggered by single pH or temperature stimulus. The gating characteristics of the membranes are mainly dominated by the first blocks in the grafted diblock polymers, and the second blocks have smaller effect on it. The pH-responsive gating coefficient of grafted PMAA chains is more significant than the thermo-responsive gating coefficient of grafted PNIPAM chains. The results in this study provide valuable guidance for designing and preparing dual- or multi-responsive gating membranes.

Key words: 原子转移自由基聚合法, 嵌段共聚物, 双重响应, 聚甲基丙烯酸, 聚N-异丙基丙烯酰胺