

FOLLOWUS
School of Chemical and Material Engineering and Institute of Quantum Materials, Hubei Polytechnic University, Huangshi 435003, China
Xiao-ju Lu (卢小菊), E-mail:xiaoju_lu@163.com
Received:11 August 2016,
Revised:2016-10-21,
Accepted:22 October 2016,
Published:2017-04
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Xiao-ju Lu, Xiang-yu Yang, Yuan Meng, et al. Temperature and pH Dually-responsive Poly (
Stimuli-responsive polymers have undoubtedly been of great interest in the past decades due to a variety of their potential applications in biomedical territory. However
their non-degradability limits their
in vivo
applications. Herein
we report a novel pH and temperature dual-stimuli responsive-poly (
β
-amino ester). The pH/temperature sensitivities are interrelated and can be easily tuned by changing PEG-diacrylate chain length and the percentage of biamines in the feed ratio. These dual-responsive polymers are very useful in drug delivery. Reaction of methyl ether poly (ethylene glycol) (MPEG) and poly (
β
-amino ester) resulted in an amphiphilic MPEG-PBAE block copolymer which could form nanoparticles by self-assembly. A hydrophobic drug (DOX) was loaded in the self-assembled nanoparticles at low temperature without using organic solvents. The loaded drug was released very slowly and steadily at 37℃ under physiological conditions (pH 7.4)
but rapidly released from the micelles in weakly acidic environments (pH 6.4 and 5.0) for intracellular drug release. Thus
these poly (
β
-amino ester) polymers constitute ideal drug carriers since their thermal sensitivity allows the drug loadings without using organic solvent and their pH sensitivity permits fast intracellular drug release.
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