{"title":"密集接枝到板状颗粒上的聚合物链构象","authors":"Yusuke Watanabe, Yusuke Kakizawa, Shinya Kato, Sayaka Yamagishi, Naruki Kurokawa, Masatoshi Tokita","doi":"10.1021/acs.macromol.4c01702","DOIUrl":null,"url":null,"abstract":"Polymer-grafted platelets (PGPLs) were prepared via atom transfer radical polymerization of butyl methacrylate with the initiator bonded to the surface of hematite platelets, and the conformation of the poly(butyl methacrylate) (PBMA) chains grafted onto the top and bottom of the platelets at a dimensionless graft density (σ*) of 0.3–0.9 was studied. PGPLs were shaped into films with platelets parallel to the film surface via dispersion casting followed by hot pressing. The face-to-face distance between platelets increases with the number-average molecular weight of the grafted polymer and equals 2<i>L</i><sub>c</sub>σ*, where <i>L</i><sub>c</sub> is the contour length of the grafted PBMA chains. This suggests that the polymer chains grafted onto a platelet are stretched perpendicular to the platelet face to a similar extent as those grafted onto flat substrates, and their ends are opposed to those grafted from the opposite platelets to fill the space between the platelets.","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Chain Conformation of Polymers Densely Grafted onto Plate-Shaped Particles\",\"authors\":\"Yusuke Watanabe, Yusuke Kakizawa, Shinya Kato, Sayaka Yamagishi, Naruki Kurokawa, Masatoshi Tokita\",\"doi\":\"10.1021/acs.macromol.4c01702\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Polymer-grafted platelets (PGPLs) were prepared via atom transfer radical polymerization of butyl methacrylate with the initiator bonded to the surface of hematite platelets, and the conformation of the poly(butyl methacrylate) (PBMA) chains grafted onto the top and bottom of the platelets at a dimensionless graft density (σ*) of 0.3–0.9 was studied. PGPLs were shaped into films with platelets parallel to the film surface via dispersion casting followed by hot pressing. The face-to-face distance between platelets increases with the number-average molecular weight of the grafted polymer and equals 2<i>L</i><sub>c</sub>σ*, where <i>L</i><sub>c</sub> is the contour length of the grafted PBMA chains. This suggests that the polymer chains grafted onto a platelet are stretched perpendicular to the platelet face to a similar extent as those grafted onto flat substrates, and their ends are opposed to those grafted from the opposite platelets to fill the space between the platelets.\",\"PeriodicalId\":51,\"journal\":{\"name\":\"Macromolecules\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2024-11-15\",\"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.4c01702\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"POLYMER SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Macromolecules","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acs.macromol.4c01702","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
Chain Conformation of Polymers Densely Grafted onto Plate-Shaped Particles
Polymer-grafted platelets (PGPLs) were prepared via atom transfer radical polymerization of butyl methacrylate with the initiator bonded to the surface of hematite platelets, and the conformation of the poly(butyl methacrylate) (PBMA) chains grafted onto the top and bottom of the platelets at a dimensionless graft density (σ*) of 0.3–0.9 was studied. PGPLs were shaped into films with platelets parallel to the film surface via dispersion casting followed by hot pressing. The face-to-face distance between platelets increases with the number-average molecular weight of the grafted polymer and equals 2Lcσ*, where Lc is the contour length of the grafted PBMA chains. This suggests that the polymer chains grafted onto a platelet are stretched perpendicular to the platelet face to a similar extent as those grafted onto flat substrates, and their ends are opposed to those grafted from the opposite platelets to fill the space between the platelets.
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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