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説明:

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.

権利情報:

• In Copyright
  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. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. 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.

キーワード: azobenzene, hydrophobic effect, isomerization, liquid-liquid phase separation, molecular weight

刊行年月日: 2023-05-12

出版者: Wiley

掲載誌:

• MACROMOLECULAR RAPID COMMUNICATIONS (ISSN: 10221336) vol. 44 issue. 14 p. 0-0

研究助成金:

• JSPS 18H02010
• JSPS 18K19946
• JSPS 20H02804
• JSPS 20K21229
• JSPS 20J01898

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4299

公開URL: https://doi.org/10.1002/marc.202300118

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更新時刻: 2024-05-02 08:30:15 +0900

MDRでの公開時刻: 2024-05-02 08:30:15 +0900