Hydrogel formation by the 'topological conversion' of cyclic PLA-PEO block copolymers
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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'.
Journal
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- Polymer journal
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Polymer journal 48 (4), 391-398, 2016-04
Nature Publishing Group
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Details 詳細情報について
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- CRID
- 1050001339020468096
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- NII Article ID
- 120005906894
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- NII Book ID
- AA00777013
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- HANDLE
- 2115/62896
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- NDL BIB ID
- 027218701
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- ISSN
- 00323896
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- NDL
- CiNii Articles