Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 29, Issue 6, Pages 490-497Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200700721
Keywords
biodegradable; pH responsive; phase diagrams; stimuli-sensitive polymers; temperature responsive
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A series of novel pH- and temperature-responsive diblock copolymers composed of poly(N-isopropylacrylamide) (PNIPAM) and poly[(L-glutamic acid)-co-(gamma-benzyl L-glutamate)] [P(GA-co-BLG)] were prepared. The influence of hydrophobic benzyl groups on the phase transition of the copolymers was studied for the first time. With increasing BLG content in P(GA-co-BLG) block, the thermal phase transition of the diblock copolymer became sharper at a designated pH and the critical curve of phase diagram of the diblock copolymer shifted to a higher pH region. Notably, when the BLG content in P(GA-co-BLG) block was more than 30 mol.-%, the diblock copolymer responded sharply to a narrow pH change in the region of pH 7.4-5.5.
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