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作者： Palermo, Edmund F. McNeil, Anne J. Department of Chemistry and Macromolecular Science and Engineering Program University of Michigan 930 North University Avenue Ann ArborMI48109-1055 United States

ISBN: (纸本)9780841230019

Gradient sequence copolymers exhibit a gradual change in comonomer composition along the polymer chain. These novel materials are interesting because they exhibit unique properties compared to their random, alternating and block copolymer counterparts. We describe herein the synthesis and characterization of the first π-conjugated gradient sequence copolymers, which have only recently been accessible via a controlled, chain-growth synthetic method. We demonstrate that the gradient sequence copolymers exhibit unique thermal, optical and morphological properties compared to the analogous block and random copolymers. In addition, we show that gradient sequence copolymers can act as additives to modulate the thin film morphologies and phase separation behavior of polymer/polymer and polymer/fullerene blends. The impact of gradient sequence copolymer-based additives in stabilizing bulk heterojunction organic solar cells is also described. © 2014 American Chemical Society.

关键词： Phase separation

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Erratum: “The scaling of zero-shear viscosities of semidilute polymer solutions with concentration” [J. Rheol. 49, 1117–1128 (2005)]

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Journal of Rheology 2007年第5期51卷 1099-1100页

作者： Youngsuk Heo Ronald G. Larson Macromolecular Science and Engineering Program University of Michigan Ann Arbor Michigan 48109 Department of Chemical Engineering and Macromolecular Science and Engineering Program University of Michigan Ann Arbor Michigan 48109

Page 1124. For three distinct polymer-solvent pairs, namely polystyrene in benzene, polyisoprene in cyclohexane, and polybutadiene in cyclohexane, we erroneousl

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Dendritic platinum-copper bimetallic nanoassemblies with tunable composition and structure： Arginine-driven self-assembly and enhanced electrocatalytic activity

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Nano Research 2016年第3期9卷 755-765页

作者： Gengtao Fu Huimin Liu Nika You Jiayan Wu Dongmei Sun Lin Xu Yawen Tang Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province School of Materials Science and Engineering Shaanxi Normal University Xi'an 710062 China Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials School ot Chemistry and Materials Science Nanjing Normal University Nanjing 210023 China Materials Science and Engineering Program & Texas Materials Institute The University of Texas atAustin Austin Texas 78712 USA

Novel self-assembled architectures have received a growing amount of attention and have significant potential for application in catalysis/electrocatalysis. Herein, we take advantage of the unique coordination and self-assembly properties of arginine for the preparation of dendritic PtCu bimetallic nanoassemblies with tunable chemical composition and structure. Strong interactions between the arginine molecules are key in driving the self-assembly of primary nanocrystals. In addition, the strong coordination interactions between arginine and metal ions is responsible for the formation of Pt-Cu alloys. We also investigated the electrocatalytic activity of various dendritic PtCu bimetallic nanoassemblies towards the methanol oxidation reaction. PtBCUl nanoassemblies exhibited excellent electrocatalytic activity and stability in comparison with other PtCu bimetallic nanoassemblies （PtlCu3, PtlCu~） and commercial Pt black, due to their unique dendritic structures and the synergistic effect between the Pt and Cu atoms.

关键词： platinum-copper nanoassemblies arginine molecules electrocatalysis methanol oxidation

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Tear Growth Mechanisms in High-Grade Bursal-Sided Partial Thickness Tears in the Rotator Cuff Measured with Full Volume Methods

SSRN

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SSRN 2025年

作者： Villacís Núñez, Carla Nathaly Scheven, Ulrich Bedi, Asheesh Arruda, Ellen M. Department of Mechanical Engineering University of Michigan G.G. Brown Laboratory 2350 Hayward St. Ann ArborMI48109 United States Department of Orthopedic Surgery University of Michigan Taubman Health Care Center 2912 1500 E Medical Center Dr. Ann ArborMI48109 United States Department of Biomedical Engineering University of Michigan 1107 Carl A. Gerstacker Building 2200 Bonisteel Blvd Ann ArborMI48109 United States Program of Macromolecular Science and Engineering University of Michigan 1221 Beal Ave Ann ArborMI48109 United States 2464 Stone Rd. Ann ArborMI48105 United States

In this work, we evaluate the mechanical response of rotator cuff tendons with high-grade partial thickness tears through a novel full volume measurement technique. As opposed to traditional strain-measurement methods, which examine surfaces of the tendon or localized two-dimensional regions, we have probed three-dimensional strains including internal locations. Differences between the intact and torn states have been considered. The torn condition depicts sliding between cut/uncut tissue regions, revealing regions of high shear strain concentration at the boundaries of detached/attached tissue portions. At both submaximal and supramaximal force levels, the internal and inferior bands of the tendon show high shear strain magnitudes, which could indicate regions of high risk for tear propagation. Geometrical features which could explain strain distribution differences in their intact and torn conditions are also analyzed. Through the understanding of full volume displacement and strain distributions, our study elucidates why two-dimensional values might not represent the global behavior of the injured tendon, critical components of the Lagrangian strain tensor which have not been probed before, and important implications for surgical repairs. © 2025, The Authors. All rights reserved.

关键词： Tendons

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Bioimmobilization using huisgen -dipolar cycloaddition on vapor-based polymer coatings

Bioimmobilization using huisgen -dipolar cycloaddition on va...

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235th ACS National Meeting, Spring 2008

作者： Nandivada, Himabindu Jiang, Xuwei Panades, Augusti Bourke, Allison Yoshida, Mutsumi Chen, Hsien-Yeh Lahann, Joerg Macromolecular Science and Engineering Program Department of Chemical Engineering University of Michigan 2300 Hayward St. Ann Arbor MI 48109-2136 United States

No abstract available

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Spatially controlled engineering of biointerfaces via functionalized poly-p-xylylenes

Spatially controlled engineering of biointerfaces via functi...

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235th ACS National Meeting, Spring 2008

作者： Chen, Hsien-Yeh Jiang, Xuwei Yoshida, Mutsumi Lahann, Joerg Macromolecular Science and Engineering Program Department of Chemical Engineering University of Michigan 2300 Hayward St. Ann Arbor MI 48109-2136 United States

No abstract available

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Influence of conformational change of chain unit on the intrinsic negative thermal expansion of polymers

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Chinese Chemical Letters 2021年第4期32卷 1515-1518页

作者： Qiangsheng Sun Ke Jin Yuhui Huang Jia Guo Thanyada Rungrotmongkol Phornphimon Maitarad Changchun Wang State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science Fudan UniversityShanghai 200433.China Biocatalyst and Environmental Biotechnology Research Unit Department of BiochemistryFaculty of Science and Program in Bioinformatics and Computational BiologyGraduate SchoolChulalongkom UniversityBangkok 10330Thailand Research Center of Nano Science and Technology Shanghai UniversityShanghai 200444China

Negative thermal expansion(NTE) behavior has roused wide interest for the control of thermomechanical properties of functional *** NTE behaviors have been found in kinds of compounds,it remains challenging for polymers to achieve intrinsic NTE *** this work,we systematically studied the conformational change of dibenzocyclooctadiene(DBCOD) derivatives between chair(C) and twist-boat(TB) forms based on density-functional theo ry(DFT) calculations,and found clear evidence of the relationship between the structure of DBCOD units and the thermal contraction behavior of the related *** order to obtain the polymer with NTE property,two conditions should be met for the thermal contracting DBCOD related units as follows:(i) the TB conformation can turn into C conformation as the temperature increases,and(ii) the volume of C conformation is smaller than that of TB *** rule should offer a guidance to exploration of the new intrinsic NTE polymers in the future.

关键词： Negative thermal expansion Conformational change Polyarylamides Density-functional theory Dibenzocyclooctadiene

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Selective Electrochemical Reduction of CO₂ to Metal Oxalates in Nonaqueous Solutions Using Trace Metal Pb on Carbon Supports Enhanced by a Tailored Microenvironment

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Advanced Energy Materials 2025年

作者： Brower, Rowan S. Wuille Bille, Brian Chiu, Shawn Perryman, Joseph T. Yao, Libo Agboola, Faridat O. Nagasaka, Cocoro A. Xie, Yinuo Gomez-Caballero, Richard Kumari, Ankita Neumann, Elizabeth K. Alexandrova, Anastassia N. McCrory, Charles C. L. Velázquez, Jesus M. Department of Chemistry University of California-Davis Davis 95616 CA United States Department of Chemistry and Biochemistry University of California-Los Angeles Los Angeles 90095-1569 CA United States Department of Chemical Engineering University of Michigan Ann Arbor 48109 MI United States Department of Chemistry University of Michigan Ann Arbor 48109-1055 MI United States Department of Chemistry Universidad de Puerto Rico Recinto de Río Piedras San Juan PR 00931-3346 Puerto Rico Macromolecular Science & Engineering Program University of Michigan Ann Arbor 48109-2102 MI United States

In this work, the electroreduction of carbon dioxide (CO2) to oxalate is enabled by incorporating trace metallic lead (Pb) on carbon-based supports (CBS) with polymer overlayers. These composite materials serve as an ... 详细信息

In this work, the electroreduction of carbon dioxide (CO₂) to oxalate is enabled by incorporating trace metallic lead (Pb) on carbon-based supports (CBS) with polymer overlayers. These composite materials serve as an efficient electrocatalytic system for the facile conversion and storage of CO₂, a pernicious atmospheric pollutant. Results from controlled potential electrolysis experiments indicate that 1) trace metallic Pb on the ppb scale is active toward the reductive coupling of CO₂ to oxalate at comparable Faradaic efficiencies to bulk metallic Pb and 2) polymer encapsulation of this trace metallic Pb leads to promotion of CO₂ reduction (CO₂R) selectively to metal oxalates over other products such as CO. Importantly, metal oxalates are important alternative cementitious materials and precursors for other materials’ synthesis applications. The solid products undergo rigorous spectroscopic characterization, including ¹³CO₂ labeling experiments, to ensure the metal oxalates are in fact produced from CO₂R. These findings serve as a model for leveraging microenvironment effects to enhance activity and selectivity for CO₂R using trace-metal catalysts for carbon utilization and storage technologies. © 2025 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH.

关键词： alternative cementitious materials carbon capture and utilization carbon dioxide reduction catalyst microenvironment trace metal

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Functional surface modification of anisotropic biphasic nanoparticles for selective cell targeting

Functional surface modification of anisotropic biphasic nano...

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8th World Biomaterials Congress 2008, WBC 2008

作者： Yoshida, Mutsumi Roh, Kyung-Ho Lahann, Joerg Department of Chemical Engineering University of Michigan Ann Arbor MI United States Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI United States

ISBN: (纸本)9781615670802

Biocompatibility of biphasic particles supports their use in biomedical applications. With the added capability of selectively targeting cells with directionality and controlled orientation, the biphasic nanocolloids may serve as a flexible platform requiring complex, multifunctionality, as both compartments can be independently loaded as well as be surface-modified to control orientation relative to the cell surface. Taken together these properties of anisotropic biphasic nanocolloids may enable capabilities such as self-assembly into three-dimensional tissue constructs or mimicry of subcellular organization which may not be achievable with more conventional, isotropic nanoparticles.

关键词： Nanoparticles

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Short-term biocompatibility of functionalized polymer coatings made by chemical vapor deposition polymerization

Short-term biocompatibility of functionalized polymer coatin...

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8th World Biomaterials Congress 2008, WBC 2008

作者： Yoshida, Mutsumi Elkasabi, Yaseen Lahann, Joerg Department of Chemical Engineering University of Michigan Ann Arbor MI United States Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI United States

ISBN: (纸本)9781615670802

CVD polymerization of functionalized [2.2]paracyclophanes provides a generalized, simple process by which multiple reactivity can be afforded on various substrates with a range of geometry or topology. In addition, this method provides controllable ratios of presented functional groups and minimizes cross-reactivity of biomolecules as immobilization can be done in sequence. Initial assessment of biocompatibility of CVD coatings underscore the importance of controlled ratio of surface-presented functional groups, as small differences in the chemical composition of co-polymers can have significant impact in cellular response.

关键词： Biocompatibility

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