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Hydrogel formation by the 'topological conversion' of cyclic PLA-PEO block copolymers

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Title: Hydrogel formation by the 'topological conversion' of cyclic PLA-PEO block copolymers
Authors: Yamamoto, Takuya Browse this author
Inoue, Kotaro Browse this author
Tezuka, Yasuyuki Browse this author
Issue Date: Apr-2016
Publisher: Nature Publishing Group
Journal Title: Polymer journal
Volume: 48
Issue: 4
Start Page: 391
End Page: 398
Publisher DOI: 10.1038/pj.2015.134
Abstract: An amphiphilic cyclic block copolymer consisting of poly(L- or D-lactide) and poly(ethylene oxide), that is, PLLA-PEO or PDLA-PEO, was synthesized from its corresponding linear triblock precursor, PLLA-PEO-PLLA or PDLA-PEO-PDLA, respectively, with alkenyl end groups. A mixture of the micellar dispersions of linear PLLA-PEO-PLLA and linear PDLA-PEO-PDLA formed a gel upon heating, whereas a mixture of the cyclic counterparts did not undergo this phase transition. These results suggest that the gelation behavior is directed by the topology of the polymer components. Furthermore, cyclic PLLA-PEO and cyclic PDLA-PEO block copolymers incorporating photocleavable o-nitrobenzyl units were synthesized. A mixture of the micellar dispersions of these block copolymers formed a gel upon ultraviolet irradiation via the 'topological conversion'.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 拓矢

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