{"title":"Molecular Weight Determination of Kuhn Monomers from a Dynamic Property of Polymers","authors":"Hiroki Degaki, Loren Jørgensen, Tsuyoshi Koga, Tetsuharu Narita","doi":"10.1021/acs.macromol.4c02598","DOIUrl":null,"url":null,"abstract":"Dynamic rheological responses of polymer solutions exhibit a range of dynamic modes reflecting the hierarchical structures with different characteristic lengths such as the Kuhn length and mesh size. The polymer contribution to the viscoelastic modulus at each dynamic mode is proportional to the number density of unit segments at the corresponding hierarchical level, allowing for the determination of their molecular weight. This paper evaluates the molecular weight of a Kuhn monomer from the boundary between the Zimm and bending modes, using a worm like micellar solution of cetylpyridinium chloride/sodium salicylate as a model system. Employing high-frequency diffusing-wave spectroscopy microrheology, we determined the molecular weight, which agrees well with that measured by static light scattering. We showed that the radius of the Kuhn monomer was also accurately estimated from the characteristic volume related with the molecular weight. The proposed method holds potential for application across various dynamic modes and polymer solutions.","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"3 1","pages":""},"PeriodicalIF":5.1000,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Macromolecules","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acs.macromol.4c02598","RegionNum":1,"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
Dynamic rheological responses of polymer solutions exhibit a range of dynamic modes reflecting the hierarchical structures with different characteristic lengths such as the Kuhn length and mesh size. The polymer contribution to the viscoelastic modulus at each dynamic mode is proportional to the number density of unit segments at the corresponding hierarchical level, allowing for the determination of their molecular weight. This paper evaluates the molecular weight of a Kuhn monomer from the boundary between the Zimm and bending modes, using a worm like micellar solution of cetylpyridinium chloride/sodium salicylate as a model system. Employing high-frequency diffusing-wave spectroscopy microrheology, we determined the molecular weight, which agrees well with that measured by static light scattering. We showed that the radius of the Kuhn monomer was also accurately estimated from the characteristic volume related with the molecular weight. The proposed method holds potential for application across various dynamic modes and polymer solutions.
期刊介绍：
Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.
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