

FOLLOWUS
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China
Shou-xin Liu (刘守信), E-mail: liushx@snnu.edu.cn
Received:29 January 2016,
Revised:2016-3-1,
Accepted:30 March 2016,
Published:2016-08
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Na-er Guang, Shou-xin Liu, Xuan Li, et al. Micellization and Gelation of the Double Thermoresponsive ABC-type Triblock Copolymer Synthesized by RAFT[J]. Chinese Journal of Polymer Science, 2016, 34(8): 965-980.
Na-er Guang, Shou-xin Liu, Xuan Li, et al. Micellization and Gelation of the Double Thermoresponsive ABC-type Triblock Copolymer Synthesized by RAFT[J]. Chinese Journal of Polymer Science, 2016, 34(8): 965-980. DOI: 10.1007/s10118-016-1817-1.
A double thermoresponsive ABC-type triblock copolymer (poly(ethyleneglycol)-block-poly(2-(2-methoxyethoxy) ethyl methacrylate)-block-poly(2-(2-methoxy ethoxy) ethyl methacrylate-
co
-oligo(ethylene glycol) methyl ether methacrylate
PEG-
b
-PMEO
2
MA-
b
-P(MEO
2
MA-
co
-OEGMA)) was designed and synthesized by reversible addition-fragmentation chain transfer polymerization (RAFT). The ABC-type triblock copolymer endowed a thermal-induced two-step phase transition at 29 and 39℃
corresponding to the thermosensitive properties of PMEO
2
MA and P(MEO
2
MA-
co
-OEGMA) segments
respectively. The two-step self-assembly of copolymer solutions was studied by UV transmittance measurement
dynamic light scattering (DLS)
transmission electron microscopy (TEM) and so on. The triblock copolymers showed the distinct thermosensitive behavior with respect to transition temperatures
aggregate type and size
which was correlated to the degree of polymerization of thermosensitive blocks and the molar fraction of OEGMA in the P(MEO
2
MA-
co
-OEGMA) segments. In addition
micelles could further aggregate to form the hydrogel by the self-associate of PEG chains under the abduction of the concentration and temperature. The transition from sol to gel was investigated by a test tube inverting method and dynamic rheological measurement.
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