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Cho NH, Shi J, Murphy RP, Riley JK, Rogers SA, Richards JJ. Extracting microscopic insight from transient dielectric measurements during large amplitude oscillatory shear. SOFT MATTER 2023. [PMID: 37681714 DOI: 10.1039/d3sm00786c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
Probing the transient microstructure of soft matter far from equilibrium is an ongoing challenge to understanding material processing. In this work, we investigate inverse worm-like micelles undergoing large amplitude oscillatory shear using time-resolved dielectric spectroscopy. By controlling the Weissenburg number, we compare the non-linear microstructure response of branched and unbranched worm-like micelles and isolate distinct elastic effects that manifest near flow reversal. We validate our dielectric measurements with small angle neutron scattering and employ sequence of physical processes to disentangle the elastic and viscous contributions of the stress.
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Affiliation(s)
- Noah H Cho
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, USA.
| | - Jiachun Shi
- Department of Chemical and Biomolecular Engineering, University of Illinois of Urbana-Champaign, Urbana, Illinois, USA
| | - Ryan P Murphy
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - John K Riley
- Performance Materials Coatings, The Dow Chemical Company, Collegeville, Pennsylvania, USA
| | - Simon A Rogers
- Department of Chemical and Biomolecular Engineering, University of Illinois of Urbana-Champaign, Urbana, Illinois, USA
| | - Jeffrey J Richards
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, USA.
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Clarifying effect of multimodal polymerization on thermal, rheological, and mechanical properties of HDPE pipe resin. JOURNAL OF POLYMER RESEARCH 2023. [DOI: 10.1007/s10965-023-03445-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Long C, Dong Z, Liu X, Yu F, Shang Y, Wang K, Feng S, Hou X, He C, Chen ZR. Simultaneous enhancement in processability and mechanical properties of polyethylenes via tuning the molecular weight distribution from unimodal to bimodal shape. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kida T, Hiejima Y, Nitta KH, Yamaguchi M. Evaluation of microscopic structural changes during strain hardening of polyethylene solids using In situ Raman, SAXS, and WAXD measurements under step-cycle test. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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Kida T, Yamaguchi M. Role of Rigid–Amorphous chains on mechanical properties of polypropylene solid using DSC, WAXD, SAXS, and Raman spectroscopy. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124834] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wang CG, Chong AML, Goto A. One Reagent with Two Functions: Simultaneous Living Radical Polymerization and Chain-End Substitution for Tailoring Polymer Dispersity. ACS Macro Lett 2021; 10:584-590. [PMID: 35570769 DOI: 10.1021/acsmacrolett.1c00179] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The molecular weight distribution of polymer, termed dispersity (Đ), is a fundamental parameter that determines polymer properties. Sodium azide (NaN3) functions as a catalyst in organocatalyzed living radical polymerization when the reaction medium is nonpolar. In contrast, NaN3 can act as a nucleophile when the reaction medium is polar. In this paper, we report an efficient approach to dispersity control by exploiting the dual functions of NaN3 under the varied solvent polarity. Simultaneous polymerization and chain-end substitution allowed us to tune the Đ values of various polymethacrylates and poly(butyl acrylate). Notably, the Đ value could be tuned to a wide range approximately from 1.2 to 2.0 for polymethacrylates and to 3.8 for poly(butyl acrylate). This approach afforded polymer brushes on surfaces with tailored Đ values. An interesting finding was that the polymer brushes exhibited a unique interaction with external molecules, depending on the Đ value.
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Affiliation(s)
- Chen-Gang Wang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Amerlyn Ming Liing Chong
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Atsushi Goto
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
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Kato S, Aoki D, Oikawa K, Tsuchiya K, Numata K, Otsuka H. Visualization of the Necking Initiation and Propagation Processes during Uniaxial Tensile Deformation of Crystalline Polymer Films via the Generation of Fluorescent Radicals. ACS Macro Lett 2021; 10:623-627. [PMID: 35570755 DOI: 10.1021/acsmacrolett.1c00185] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
To visualize and simultaneously quantify the necking behavior of crystalline polymer films during uniaxial stretching, tetraarylsuccinonitrile (TASN) moieties were introduced into polymers at the center of the main chain. TASN can produce a relatively stable radical that emits yellow fluorescence in response to mechanical stress. During the uniaxial elongation test of the TASN-centered crystalline polymers, the yellow fluorescence derived from the dissociated TASN radicals was used for microscale observations that showed the orientation of the polymer chains in the stretching direction. Furthermore, by comparing the radical generation in linear and star-shaped TASN-centered crystalline polymers during their tensile deformation, we found that the TASN dissociation ratio is higher in the star-shaped polymer, which has more chains connected to the lamellar crystal. Thus, the microforces generated in the amorphous region during uniaxial stretching were probed via the use of TASN, which allowed a direct visualization of the necking initiation and propagation processes as well as a quantification via electron paramagnetic resonance spectroscopy.
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Affiliation(s)
- Sota Kato
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Daisuke Aoki
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Kazusato Oikawa
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kousuke Tsuchiya
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Keiji Numata
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hideyuki Otsuka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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Kida T, Tanaka R, Hiejima Y, Nitta KH, Shiono T. Improving the strength of polyethylene solids by simple controlling of the molecular weight distribution. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123526] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Aoki D, Ajiro H. Clarification of the effects of topological isomers on the mechanical strength of comb polyurethane. Polym Chem 2021. [DOI: 10.1039/d0py01391a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrated the mechanical enhancement behavior of the comb polyurethanes by the topological isomer system between the linear and comb polyurethane. Also, we assumed the mechanical enhancement mechanism by the rheological properties.
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Affiliation(s)
- Daisuke Aoki
- Graduate School of Materials Science
- Nara Institute of Science and Technology
- Nara 630-0192
- Japan
| | - Hiroharu Ajiro
- Graduate School of Materials Science
- Nara Institute of Science and Technology
- Nara 630-0192
- Japan
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Kida T, Hiejima Y, Nitta KH. Microstructural Interpretation of Influences of Molecular Weight on the Tensile Properties of High-Density Polyethylene Solids Using Rheo-Raman Spectroscopy. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c02124] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Takumitsu Kida
- Department of Chemical and Materials Science, Kanazawa University, Kakuma Campus, Kanazawa 920-1192, Japan
| | - Yusuke Hiejima
- Department of Chemical and Materials Science, Kanazawa University, Kakuma Campus, Kanazawa 920-1192, Japan
| | - Koh-hei Nitta
- Department of Chemical and Materials Science, Kanazawa University, Kakuma Campus, Kanazawa 920-1192, Japan
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Hiejima Y, Kida T, Nitta KH. In situ Raman Spectroscopic Observation of Polymer Chains in Semi-Crystalline Polyethylene Solids. Z PHYS CHEM 2020. [DOI: 10.1515/zpch-2020-1618] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In situ Raman spectroscopy is applied for polyethylene solid under various environments to elucidate the morphological and conformational changes. The trans conformation retains up to higher temperature for high-density polyethylene, reflecting higher stability of the orthorhombic crystals composed of stacked trans chains. It is suggested that the conversion of the non-crystalline trans chains to the crystalline phase is the microscopic origin of thermal history in the crystallinity, whereas the transformation between the trans and gauche conformers is practically in thermal equilibrium. Microscopic and dynamic mechanism of deformation during uniaxial stretching is investigated for the molecular orientation and the microscopic load sharing on the crystalline and amorphous chains. Lower crystallinity results in smoother and higher orientation toward the stretching direction, as well as higher load on the amorphous chains, during tensile elongation.
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Affiliation(s)
- Yusuke Hiejima
- Department of Chemical and Materials Science , Kanazawa University, Kakuma Campus , Kanazawa 920-1192 , Japan
| | - Takumitsu Kida
- Department of Chemical and Materials Science , Kanazawa University, Kakuma Campus , Kanazawa 920-1192 , Japan
| | - Koh-hei Nitta
- Department of Chemical and Materials Science , Kanazawa University, Kakuma Campus , Kanazawa 920-1192 , Japan
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12
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Rheo-Raman spectroscopic study of plasticity and elasticity transformation in poly(ether-block-amide) thermoplastic elastomers. POLYMER 2020. [DOI: 10.1016/j.polymer.2019.122128] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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