{"title":"Helical diamagnetism of a polyaniline-based polynitroxyl radical/hydroxypropyl cellulose blend","authors":"Ryo Miyashita , Yutaka Shike , Reiji Kumai , Hiromasa Goto","doi":"10.1016/j.eurpolymj.2025.113790","DOIUrl":null,"url":null,"abstract":"<div><div>In this study, poly(<em>m</em>-aniline) was synthesized via Pd-catalyzed cross-coupling polycondensation (Buchwald–Hartwig coupling) and oxidized using <em>m</em>-chloroperoxybenzoic acid (Tokumaru reaction) to generate nitroxyl radicals on the mainchains. Furthermore, oxidized poly(<em>m</em>-aniline) was blended with hydroxypropyl cellulose, which is a helical liquid crystal polymer. The obtained blend polymer was characterized using polarizing optical microscopy, scanning electron microscopy, and optical spectroscopy. The magnetic properties of the blend polymer were investigated using electron spin resonance and a superconducting quantum interference device. The mainchain of oxidized poly(<em>m</em>-aniline) in the matrix formed a helical structure because hydroxypropyl cellulose served as a helical template. Consequently, the spins on the mainchain resulted in the formation of a helical structure, and the blend polymer exhibited a helical diamagnetic behavior.</div></div>","PeriodicalId":315,"journal":{"name":"European Polymer Journal","volume":"228 ","pages":"Article 113790"},"PeriodicalIF":6.3000,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"European Polymer Journal","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0014305725000783","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, poly(m-aniline) was synthesized via Pd-catalyzed cross-coupling polycondensation (Buchwald–Hartwig coupling) and oxidized using m-chloroperoxybenzoic acid (Tokumaru reaction) to generate nitroxyl radicals on the mainchains. Furthermore, oxidized poly(m-aniline) was blended with hydroxypropyl cellulose, which is a helical liquid crystal polymer. The obtained blend polymer was characterized using polarizing optical microscopy, scanning electron microscopy, and optical spectroscopy. The magnetic properties of the blend polymer were investigated using electron spin resonance and a superconducting quantum interference device. The mainchain of oxidized poly(m-aniline) in the matrix formed a helical structure because hydroxypropyl cellulose served as a helical template. Consequently, the spins on the mainchain resulted in the formation of a helical structure, and the blend polymer exhibited a helical diamagnetic behavior.
期刊介绍：
European Polymer Journal is dedicated to publishing work on fundamental and applied polymer chemistry and macromolecular materials. The journal covers all aspects of polymer synthesis, including polymerization mechanisms and chemical functional transformations, with a focus on novel polymers and the relationships between molecular structure and polymer properties. In addition, we welcome submissions on bio-based or renewable polymers, stimuli-responsive systems and polymer bio-hybrids. European Polymer Journal also publishes research on the biomedical application of polymers, including drug delivery and regenerative medicine. The main scope is covered but not limited to the following core research areas:
Polymer synthesis and functionalization
• Novel synthetic routes for polymerization, functional modification, controlled/living polymerization and precision polymers.
Stimuli-responsive polymers
• Including shape memory and self-healing polymers.
Supramolecular polymers and self-assembly
• Molecular recognition and higher order polymer structures.
Renewable and sustainable polymers
• Bio-based, biodegradable and anti-microbial polymers and polymeric bio-nanocomposites.
Polymers at interfaces and surfaces
• Chemistry and engineering of surfaces with biological relevance, including patterning, antifouling polymers and polymers for membrane applications.
Biomedical applications and nanomedicine
• Polymers for regenerative medicine, drug delivery molecular release and gene therapy
The scope of European Polymer Journal no longer includes Polymer Physics.
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