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Mechanophoric 3‐Arm Star Functional Block Copolymer Based on Rhodamine Derivative.

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Title: Mechanophoric 3‐Arm Star Functional Block Copolymer Based on Rhodamine Derivative.
Authors: Chakraborty, Swadhin1 (AUTHOR), Chatterjee, Soumik2 (AUTHOR), Singh, N. D. Pradeep2 (AUTHOR), Lederer, Albena3,4 (AUTHOR), Geisler, Martin3 (AUTHOR), Li, Qiong3 (AUTHOR), Al‐Hussein, Mahmoud3,5 (AUTHOR), Voit, Brigitte3,6 (AUTHOR) voit@ipfdd.de, Singha, Nikhil K.1,7 (AUTHOR) nks@rtc.iitkgp.ac.in
Source: Macromolecular Materials & Engineering. Mar2026, Vol. 311 Issue 3, p1-12. 12p.
Subjects: Block copolymers, Rhodamines, Molecular switches, Polymer structure, Thermoplastic elastomers, Strains & stresses (Mechanics), Fluorescence
Abstract: This study presents a mechanoresponsive star‐shaped BCP synthesized using a 3‐arm‐rhodamine‐based ATRP initiator. The star rhodamine mechanophore was employed to construct a 3‐arm star poly(butyl acrylate)‐b‐poly(methyl methacrylate) (PBA‐b‐PMMA) BCP, alongside random star copolymers and a linear BCP for comparison. Structural characterization via NMR, SEC, and FT‐IR confirmed the successful synthesis, while DSC, AFM, and SAXS analyses revealed distinct phase separation in the BCP structures, which results in enhanced mechanical strength and features of thermoplastic elastomers in the materials. Interestingly, the synthesized mechanoresponsive tri‐arm star and bi‐arm linear architectures in both block and random copolymer configurations exhibited a switch‐off state in solution but transitioned to a "switch‐on" state in the film form due to internal strain‐induced mechanophoric activation. Once activated in the film state, the fluorescence intensity increases with increasing stretching, indicating progressive mechanophore activation under mechanical stress, however, with a complete and precise peak shift is only observed for the star BCP architecture. This allows, uniquely in the block copolymers architecture with the mechanophoric unit in the core, a precise determination of additional stress on the material after processing. The study provides new insight into the mechanochemical activation of rhodamine‐based systems and highlights the role of molecular architecture and processing state in governing mechanoresponse. [ABSTRACT FROM AUTHOR]
Copyright of Macromolecular Materials & Engineering is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Mechanophoric 3‐Arm Star Functional Block Copolymer Based on Rhodamine Derivative.
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  Data: <searchLink fieldCode="AR" term="%22Chakraborty%2C+Swadhin%22">Chakraborty, Swadhin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chatterjee%2C+Soumik%22">Chatterjee, Soumik</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Singh%2C+N%2E+D%2E+Pradeep%22">Singh, N. D. Pradeep</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lederer%2C+Albena%22">Lederer, Albena</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Geisler%2C+Martin%22">Geisler, Martin</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Qiong%22">Li, Qiong</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Al‐Hussein%2C+Mahmoud%22">Al‐Hussein, Mahmoud</searchLink><relatesTo>3,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Voit%2C+Brigitte%22">Voit, Brigitte</searchLink><relatesTo>3,6</relatesTo> (AUTHOR)<i> voit@ipfdd.de</i><br /><searchLink fieldCode="AR" term="%22Singha%2C+Nikhil+K%2E%22">Singha, Nikhil K.</searchLink><relatesTo>1,7</relatesTo> (AUTHOR)<i> nks@rtc.iitkgp.ac.in</i>
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  Data: <searchLink fieldCode="JN" term="%22Macromolecular+Materials+%26+Engineering%22">Macromolecular Materials & Engineering</searchLink>. Mar2026, Vol. 311 Issue 3, p1-12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Block+copolymers%22">Block copolymers</searchLink><br /><searchLink fieldCode="DE" term="%22Rhodamines%22">Rhodamines</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+switches%22">Molecular switches</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+structure%22">Polymer structure</searchLink><br /><searchLink fieldCode="DE" term="%22Thermoplastic+elastomers%22">Thermoplastic elastomers</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence%22">Fluorescence</searchLink>
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  Data: This study presents a mechanoresponsive star‐shaped BCP synthesized using a 3‐arm‐rhodamine‐based ATRP initiator. The star rhodamine mechanophore was employed to construct a 3‐arm star poly(butyl acrylate)‐b‐poly(methyl methacrylate) (PBA‐b‐PMMA) BCP, alongside random star copolymers and a linear BCP for comparison. Structural characterization via NMR, SEC, and FT‐IR confirmed the successful synthesis, while DSC, AFM, and SAXS analyses revealed distinct phase separation in the BCP structures, which results in enhanced mechanical strength and features of thermoplastic elastomers in the materials. Interestingly, the synthesized mechanoresponsive tri‐arm star and bi‐arm linear architectures in both block and random copolymer configurations exhibited a switch‐off state in solution but transitioned to a "switch‐on" state in the film form due to internal strain‐induced mechanophoric activation. Once activated in the film state, the fluorescence intensity increases with increasing stretching, indicating progressive mechanophore activation under mechanical stress, however, with a complete and precise peak shift is only observed for the star BCP architecture. This allows, uniquely in the block copolymers architecture with the mechanophoric unit in the core, a precise determination of additional stress on the material after processing. The study provides new insight into the mechanochemical activation of rhodamine‐based systems and highlights the role of molecular architecture and processing state in governing mechanoresponse. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Macromolecular Materials & Engineering is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/mame.202500414
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        Text: English
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        PageCount: 12
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    Subjects:
      – SubjectFull: Block copolymers
        Type: general
      – SubjectFull: Rhodamines
        Type: general
      – SubjectFull: Molecular switches
        Type: general
      – SubjectFull: Polymer structure
        Type: general
      – SubjectFull: Thermoplastic elastomers
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      – SubjectFull: Strains & stresses (Mechanics)
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      – SubjectFull: Fluorescence
        Type: general
    Titles:
      – TitleFull: Mechanophoric 3‐Arm Star Functional Block Copolymer Based on Rhodamine Derivative.
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              M: 03
              Text: Mar2026
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