Macromolecular Chemistry and Physics最新文献_第9页

Design and Depolymerization of Bis(2-hydroxyethyl) Terephthalate-Containing Polyurethanes for Vat Photopolymerization

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-09 DOI: 10.1002/macp.202400327

Clarissa C. Westover, Garvit Nayyar, Timothy E. Long

{"title":"Design and Depolymerization of Bis(2-hydroxyethyl) Terephthalate-Containing Polyurethanes for Vat Photopolymerization","authors":"Clarissa C. Westover, Garvit Nayyar, Timothy E. Long","doi":"10.1002/macp.202400327","DOIUrl":"https://doi.org/10.1002/macp.202400327","url":null,"abstract":"Vat photopolymerization (VPP) of highly aromatic polyurethanes (PUs) expands the library of additive manufacturing (AM) materials and enables a vast array of ductile thermoplastics, rigid and flexible thermosets, and elastomers. Aromatic diisocyanates and various diols enable printing of rigid, highly aromatic cross-linked parts, which offer high glass transition temperatures and tunable thermomechanical performance. The judicious control of molecular weight of the photo-reactive telechelic oligomers allows for a fundamental study of the influence of cross-link density in highly aromatic 3D PU printed objects. VPP AM produces objects with high resolution, smooth surface finish, and isotropic mechanical properties. Thermal post-processing is critical in maintaining excellent thermomechanical properties with semi-crystallinity as a function of cross-link density. Due to the presence of two ester carbonyls in the bis(2-hydroxyethyl) terephthalate chain extender, the printed parts are readily amenable to depolymerization with methanolysis to produce difunctional dimethyl dicarbamates under modest reaction conditions. Dimethyl dicarbamates serve as suitable monomers for subsequent polycondensation.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Redox Polymers: Opportunities and Challenges in their Unique Functionalities

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-09 DOI: 10.1002/macp.202400387

Hiroyuki Nishide

{"title":"Redox Polymers: Opportunities and Challenges in their Unique Functionalities","authors":"Hiroyuki Nishide","doi":"10.1002/macp.202400387","DOIUrl":"https://doi.org/10.1002/macp.202400387","url":null,"abstract":"The growing demand for energy-storage devices has raised inevitable concerns regarding the availability of redox-active inorganic compounds and metals. It is expected that some of the inorganic compounds will be replaced by organic redox polymers, which are produced from abundant sources using environmentally benign processes, and they exhibit inherent advantages, including flexibility, processability, and biocompatibility. Redox polymers contain groups that can be reversibly reduced and oxidized by gaining and releasing electrons, respectively, and constitute an emerging class of functional organic materials. This article begins with a retrospective discussion of polymers and their electron exchange concepts, presenting them as old but new materials. The basics of electrochemical redox couples are briefly reintroduced, and the chemical design strategies for extending them to redox polymers are summarized. Subsequently, the efficient and reversible charge propagation and storage in densely populated redox-active sites on soft polymer platforms are discussed. The potential to employ redox polymers in rechargeable charge-storage applications and next-generation devices is discussed, along with the current challenges and prospects. This outlook suggests fundamental questions and proposes interesting topics for redox polymers to facilitate their development as valuable materials for use in sustainable technologies.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

2-Ethylhexyl-4,6-Dibromo-3-Cyano-3-Thieno[3,4-b]Thiophene Enables Low HOMO Energy Level Polymer Donor

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-08 DOI: 10.1002/macp.202400317

Lei Wang, Yude Liu, Lihua Cao, Xiaohong Zhao, Haigang Li, Zhongyi Yuan

{"title":"2-Ethylhexyl-4,6-Dibromo-3-Cyano-3-Thieno[3,4-b]Thiophene Enables Low HOMO Energy Level Polymer Donor","authors":"Lei Wang, Yude Liu, Lihua Cao, Xiaohong Zhao, Haigang Li, Zhongyi Yuan","doi":"10.1002/macp.202400317","DOIUrl":"https://doi.org/10.1002/macp.202400317","url":null,"abstract":"The new halogen-free donor polymer PCN6 is constructed using 2-ethylhexyl-4,6-dibromo-3-cyano-thieno[3,4-b]thiophene as acceptor (A) block, and is compared in detail with the commercially available PTB7-Th. It is found that PCN6 has a wider film absorption (300–700 nm) and lower highest occupied molecular orbital (HOMO) energy levels (−5.52 eV) than PTB7-Th (−5.34 eV), suggesting a great advantage of the monocyano-functionalized modification strategy in terms of molecular absorption and energy level tuning. The performance difference between PCN6:Y6- and PTB7-Th:Y6-based organic solar cells (OSCs) is compared by a series of studies including light intensity dependence, carrier mobility, AFM, TEM, and GIWAXS. The results show that PCN6:Y6-based OSCs have stronger crystallinity, better charge transport, higher and more balanced carrier mobility, and less exciton complex loss. Therefore, the power conversion efficiency (PCE) of PCN6:Y6-based OSCs reaches 11.34%, while the PCE of PTB7-Th:Y6-based OSCs is only 9.02%. These results suggest that 2-ethylhexyl-4,6-dibromo-3-cyano-thieno[3,4-b]thiophene is an excellent A block for the construction of halogen-free donor polymers with low HOMO energy levels, and also demonstrate that the introduction of cyano in the conjugated backbone of polymers is a good strategy to achieve high-performance OSCs.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Masthead: Macromol. Chem. Phys. 21/2024 刊头：Macromol.Chem.物理 21/2024

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-08 DOI: 10.1002/macp.202470043

引用次数: 0

Front Cover: Macromol. Chem. Phys. 21/2024 封面：Macromol.Chem.21/2024

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-08 DOI: 10.1002/macp.202470042

引用次数: 0

Fluorinated Polymeric Multilayers by Off-Stoichiometric Thiol-Ene Photopolymerization

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-06 DOI: 10.1002/macp.202400315

Giuseppe Trusiano, Christine Joly-Duhamel, Chadron M. Friesen, Roberta Bongiovanni, Alessandra Vitale

引用次数: 0

Clickable Plastic Surfaces with Controllable Azide Surface Density 具有可控叠氮化物表面密度的可点击塑料表面

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-03 DOI: 10.1002/macp.202400331

Hikaru Amo, Yusuke Kanki, Miku Fujii, Kenta Morita, Tatsuo Maruyama

{"title":"Clickable Plastic Surfaces with Controllable Azide Surface Density","authors":"Hikaru Amo, Yusuke Kanki, Miku Fujii, Kenta Morita, Tatsuo Maruyama","doi":"10.1002/macp.202400331","DOIUrl":"https://doi.org/10.1002/macp.202400331","url":null,"abstract":"This study investigates the surface functionalization of plastic substrates through dip-coating in azide-functionalized polymer solutions, followed by a click reaction (i.e., strain-promoted azide–alkyne cycloaddition). Acrylic, poly(ethylene terephthalate) (PET), and nylon substrates are dip-coated with a series of polymers containing various azide groups grafted onto the poly(methyl methacrylate-co-hydroxyethyl methacrylate) backbone to examine structural effects on the surface density of clickable azide groups. X-ray photoelectron spectroscopy and fluorescence spectroscopy confirm the subsequent click-immobilization of cycloalkyne-tagged fluorescein, which is quantified to calculate the surface density of clickable azide groups. Further investigations demonstrate that the surface density of azide groups can be controlled by manipulating the polymer ratio during dip-coating, thus enabling the preparation of a linear surface gradient in terms of azide group density. Finally, the microcontact printing (µCP) method is employed to pattern the functionalized surfaces and quantify the functional molecules immobilized on the surface by µCP. This study highlights the adaptability of click chemistry and polymer coating techniques for the advanced functionalization of plastic surfaces for materials science and engineering applications.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"225 24","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tuning Interfacial Characteristics of Epoxy Composites Towards Simultaneous High Thermal and Dielectric Properties

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-11-03 DOI: 10.1002/macp.202400260

Chengzhi Zhong, Yang Feng, Bin Zhou, Peiyan Liu, Yi Zhao, Shengtao Li

{"title":"Tuning Interfacial Characteristics of Epoxy Composites Towards Simultaneous High Thermal and Dielectric Properties","authors":"Chengzhi Zhong, Yang Feng, Bin Zhou, Peiyan Liu, Yi Zhao, Shengtao Li","doi":"10.1002/macp.202400260","DOIUrl":"https://doi.org/10.1002/macp.202400260","url":null,"abstract":"Achieving excellent thermal and dielectric performance is crucial to prevent premature insulation failure of epoxy in high-frequency transformers. However, interfaces introduced by embedding micro/nano fillers in epoxy have opposite effects on these properties. Here, the interfacial characteristics of micro-BN/nano-Al2O3 epoxy is tailored composites by modifying nano-Al2O3 with functional amine groups, leading to simultaneous improvements in thermal conductivity and high-frequency breakdown strength. After modification, thermal conductivity increased from 0.193 to 0.490 W m−1 K−1 at 25 °C, and breakdown strength improved from 85.4 to 94.8 kV mm−1 at 10 kHz. The findings revealed the coexistence of overlapping interfaces between micro-BN and chemical interfaces between modified Al2O3-NH2 and matrix in composites. Contrary to the overlapping interface, the chemical interface played a more pivotal role in macroscopic performance. Calculations based on a covalent bonding interfacial model demonstrated that this in-situ tight interface facilitated phonon transport, thereby enhancing thermal conductivity. Besides the physical structure, an increase in electrostatic potential in the chemical interface also impeded charge migration, resulting in an improved breakdown strength. The synergistic effect of the chemical interface on thermal and dielectric properties presents a promising design strategy for developing high-performance epoxy composites.","PeriodicalId":18054,"journal":{"name":"Macromolecular Chemistry and Physics","volume":"226 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Recording Reflection Volume Holographic Gratings with Enhanced Performance by Two-Stage Photopolymers Containing Bifunctional Monomers

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-29 DOI: 10.1002/macp.202400285

Bin Guo, Mingxuan Wang, Diqin Zhang, Minyuan Sun, Haoqiang Gao, Yong Bi, Yuxia Zhao

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Bridging Frontiers in Macromolecular and Supramolecular Sciences with Living Cationic Ring-Opening Polymerization of Self-Organizable Dendronized Cyclic-Imino Ethers Generating Soft Frank–Kasper and Quasicrystal Arrays

IF 2.5 4区化学

Macromolecular Chemistry and Physics Pub Date : 2024-10-25 DOI: 10.1002/macp.202400339

Virgil Percec, Dipankar Sahoo

引用次数: 0