

FOLLOWUS
a.College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
b.Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, China
E-mail hzy3019@163.com (Z.Y.H.)
E-mail hshlu@swpu.edu.cn (H.S.L.)
Received:25 April 2017,
Revised:2017-7-5,
Accepted:05 July 2017,
Online First:20 October 2017,
Published:05 January 2018
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Xian-Wu Jing, Zhi-Yu Huang, Hong-Sheng Lu, et al. CO2-sensitive Amphiphilic Triblock Copolymer Self-assembly Morphology Transition and Accelerating Drug Release from Polymeric Vesicle[J]. Chinese Journal of Polymer Science, 2018, 36(1): 18-24. DOI: 10.1007/s10118-018-2008-z.
A series of triblock copolymers
containing a CO
2
-switchable block poly(2-(dimethylamino)ethyl methacrylate) (PDM) block and two symmetrical hydrophilic blocks polyacrylamide (PAM)
were synthesized using atom transfer radical polymerization (ATRP) method. The pH and conductivity tests showed that the triblock copolymer exhibited switchable responsiveness to CO
2
i.e
. a relatively low conductivity of solution could be switched on and off by bubbling and removing of CO
2
and the triblock copolymer aqueous solution displayed a CO
2
-switchable viscosity variation. The changes were all attributed to protonation of tertiary amine groups in PDM blocks and proven by
1
H-NMR. Cryogenic transmission electron microscopy and dynamic light scattering characterization demonstrated that the viscosity variation was the result of a unilamellar vesicle-network aggregate structure transition. The release of rhodamine B from the vesicles with and without CO
2
stimuli showed the potential application in drug delivery domains; after CO
2
bubbling
the drug release rate could be accelerated. Finally
reasonable mechanism of CO
2
-switchable morphology changes and CO
2
-induced drug release was proposed.
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