# Polarity Does Not Matter: Molecular Weight Reverses the Photoisomerization-Induced Phase Separation of an Azobenzene-Bearing Polymer https://mdr.nims.go.jp/datasets/d3f508b5-93fa-4c31-ad9d-b7dcd6a371e0 ## File - [Homma et al MDR.pdf](https://mdr.nims.go.jp/filesets/b05d24ec-1ac5-4e20-b075-34d0bbf6c685/download) ([Detail](https://mdr.nims.go.jp/filesets/b05d24ec-1ac5-4e20-b075-34d0bbf6c685.md)) ## Id d3f508b5-93fa-4c31-ad9d-b7dcd6a371e0 ## Local identifier ## Visibility open_to_public ## State published ## Created at 2023-12-06T22:45:10.123703Z ## Updated at 2024-05-01T23:30:15.183454Z ## Published at 2024-05-01T23:30:15.545984Z ## Doi https://doi.org/10.48505/nims.4299 ## First published url https://doi.org/10.1002/marc.202300118 ## Date published 2023-05-12 ## Recorded date published 2023-7 ## Resource type journal_article ## Manuscript type accepted_manuscript ## Collection ## Title - title: 'Polarity Does Not Matter: Molecular Weight Reverses the Photoisomerization-Induced Phase Separation of an Azobenzene-Bearing Polymer' title_type: original lang: en ## Description - description: The non-canonical photoisomerization-induced phase separation of an azobenzene-bearing polymer is found. The polymer composed of acrylate-based azobenzene (AzoAA) and N,N-dimethylacrylamide (DMA), namely poly(AzoAA-r-DMA), phase separates under visible light-induced cis-to-trans isomerization at high molecular weight, whereas the phase separation is realized under UV light-induced trans-to-cis isomerization at low molecular weight. Conventionally, the origin of photoisomerization-induced phase separation is believed to arise from the difference in polarity between the apolar trans and polar cis states; thereby the direction of phase changes, either to separate or dissolute, is uniquely determined by the polarity changes during the isomerization of azobenzene. Contrary to this common perception, the poly(AzoAA-r-DMA) in this study phase separates through both trans and cis isomerization, depending on the molecular weight. The non-canonical phase separation of poly(AzoAA-r-DMA) reported herein suggests that molecular weight plays a significant role in determining the phase behavior of azobenzene-bearing polymers. This study provides a platform for the development of spatial-temporally controlled delivery vehicles and microreactors. description_type: abstract lang: eng ## Creator - name: 本間 健太 role: author orcid: https://orcid.org/0000-0002-3960-4093 organization: National Institute for Materials Science department: Research Center for Functional Materials/Polymers and Biomaterials Field/Mechanobiology Group ror: https://ror.org/026v1ze26 - name: チャン チン シュエン role: author organization: National Institute for Materials Science department: International Center for Materials Nanoarchitectonics/Nano-System Field/Mechanobiology Group ror: https://ror.org/026v1ze26 - name: 山本 翔太 role: author orcid: https://orcid.org/0000-0002-7422-0968 organization: National Institute for Materials Science department: Research Center for Macromolecules and Biomaterials/Biomaterials Field/Mechanobiology Group ror: https://ror.org/026v1ze26 - name: 上木 岳士 role: author orcid: https://orcid.org/0000-0001-9317-6280 organization: National Institute for Materials Science department: Research Center for Macromolecules and Biomaterials/Biomaterials Field/Mechanobiology Group ror: https://ror.org/026v1ze26 - name: 中西 淳 role: author orcid: https://orcid.org/0000-0003-4457-6581 organization: National Institute for Materials Science department: Research Center for Macromolecules and Biomaterials/Biomaterials Field/Mechanobiology Group ror: https://ror.org/026v1ze26 ## Contact agent ## Publisher organization: Wiley ## Managing organization ## Keyword - subject: azobenzene schema: not_defined - subject: hydrophobic effect schema: not_defined - subject: isomerization schema: not_defined - subject: liquid-liquid phase separation schema: not_defined - subject: molecular weight schema: not_defined ## Rights - description: 'This is the peer reviewed version of the following article: Polarity Does Not Matter: Molecular Weight Reverses the Photoisomerization-Induced Phase Separation of an Azobenzene-Bearing Polymer, which has been published in final form at https://doi.org/10.1002/marc.202300118. 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The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.' identifier: http://rightsstatements.org/vocab/InC/1.0/ ## Other identifier(s) ## Data origin - data_origin_type: other ## Embargo start_date: 2023-05-02 end_date: 2024-05-02 ## Journal - title: MACROMOLECULAR RAPID COMMUNICATIONS issn: '10221336' volume: '44' issue: '14' start_page: 0 end_page: 0 ## Conference ## Related item ## Funding - identifier: 18H02010 funder_name: JSPS - identifier: 18K19946 funder_name: JSPS - identifier: 20H02804 funder_name: JSPS - identifier: 20K21229 funder_name: JSPS - identifier: 20J01898 funder_name: JSPS ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: b05d24ec-1ac5-4e20-b075-34d0bbf6c685 filename: Homma et al MDR.pdf content_type: application/pdf size: 1009722 md5: b2229734049be333df9167d58f0c2f73 ## Thumbnail fileset_id: b05d24ec-1ac5-4e20-b075-34d0bbf6c685 filename: Homma et al MDR.pdf