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Luo J, Wang X, Tong B, Li Z, Rocchi LA, Di Lisio V, Cangialosi D, Zuo B. Length Scale of Molecular Motions Governing Glass Equilibration in Hyperquenched and Slow-Cooled Polystyrene. J Phys Chem Lett 2024; 15:357-363. [PMID: 38175163 DOI: 10.1021/acs.jpclett.3c03263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Polymer glasses attain thermodynamic equilibrium owing to structural relaxation at various length scales. Herein, calorimetry experiments were conducted to trace the macroscopic relaxation of slow-cooled (SC) and hyperquenched (HQ) polystyrene (PS) glasses and based on detailed comparisons with molecular dynamics probed by dye reorientation, we discussed the possible molecular process governing the equilibration of PS glasses near the glass transition temperatures (Tg). Both SC and HQ glasses equilibrate owing to the cooperative segment motion above a characteristic temperature (Tc) slightly lower than the Tg. In contrast, below the Tc, the localized backbone motion with an apparent activation energy of 290 ± 20 kJ/mol, involving approximately six repeating units, assists equilibrium recovery of PS glasses on the experimentally accessible time scales. The results possibly indicate the presence of an alternative mechanism other than the α-cooperative process controlling physical aging of materials in their deep glassy states.
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Affiliation(s)
- Jintian Luo
- School of Chemistry and Chemical Engineering, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Xiang Wang
- School of Chemistry and Chemical Engineering, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Ben Tong
- School of Chemistry and Chemical Engineering, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Zhiqiang Li
- School of Chemistry and Chemical Engineering, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Lorenzo Augusto Rocchi
- Department of Chemistry, University of Rome "La Sapienza", P.le A. Moro 5, 00185 Rome, Italy
| | - Valerio Di Lisio
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastian, Spain
| | - Daniele Cangialosi
- Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastian, Spain
- Centro de Física de Materiales, Paseo Manuel de Lardizabal 5, 20018 San Sebastian, Spain
| | - Biao Zuo
- School of Chemistry and Chemical Engineering, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
- Zhejiang Provincial Innovation Center of Advanced Textile Technology, Shaoxing 312000, China
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2
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Chen Y, Feng S, Lu X, Pan S, Xia C, Wang LM. Uncovering the bridging role of slow atoms in unusual caged dynamics and β-relaxation of binary metallic glasses. J Chem Phys 2023; 158:134511. [PMID: 37031140 DOI: 10.1063/5.0146108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2023] Open
Abstract
The origin of β-relaxation in metallic glasses is still not fully understood, and the guidance of slow atoms for caged dynamics and β-relaxation is rarely mentioned. Using molecular dynamics simulations, we reveal the bridging role of slow atoms on unusual caged dynamics and β-relaxation. In the stage of unusual caged dynamics, slow atoms are bounded by neighboring atoms. It is difficult for the slow atoms to break the cage, producing more high-frequency vibration, which causes more atoms to jump out of the cage randomly in the next stage. Precisely, the movement of the slow atoms changes from individual atoms vibrating inside the cage and gradually breaking out of the cage into a string-like pattern. The string-like collective atomic jumps cause decay of the cages, inducing β-relaxation. This situation generally exists in binary systems with the large atomic mass difference. This work offers valuable insights for understanding the role of slow atoms in unusual caged dynamics and β-relaxation, complementing studies on the origin of β-relaxation in metallic glasses and their glass-forming liquids.
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Affiliation(s)
- Yuxuan Chen
- State Key Laboratory of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, 066004 Qinhuangdao, China
| | - Shidong Feng
- State Key Laboratory of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, 066004 Qinhuangdao, China
| | - Xiaoqian Lu
- State Key Laboratory of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, 066004 Qinhuangdao, China
| | - Shaopeng Pan
- College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, China
| | - Chaoqun Xia
- School of Materials Science and Engineering, Hebei University of Technology, 300130 Tianjin, China
| | - Li-Min Wang
- State Key Laboratory of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, 066004 Qinhuangdao, China
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3
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Tao K, Yamada K, Higashi S, Kago K, Kuwashiro S, Hirano H, Takeshita H, Tokumitsu K. Effect of molding history on molecular orientation relaxation during physical aging of polystyrene injection moldings. INT POLYM PROC 2023. [DOI: 10.1515/ipp-2022-4264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Abstract
This work examined the effect of changing molding conditions on the physical aging of polystyrene injection moldings. First, we investigated the relationship between the molecular orientation and the molding conditions. The molecular orientation near the surface changed with changing injection rate, so we hypothesized that this molecular orientation might form during the filling stage. Because this molecular orientation did not relax under heat treatment below the glass transition temperature (T
g), the oriented molecules near the surface were thought to be elongated owing to the high strain rate during the filling stage. On the other hand, the molecular orientation in the core layer changed with changing holding pressure and relaxed under heat treatment below T
g. Thus, the molecules in the core layer might become oriented during the holding stage and not be elongated owing to the slow strain rate. Furthermore, the molecular orientation in the core layer decreased with increasing mold temperature, and the physical heat resistance improved with increasing mold temperature. Meanwhile, the excess enthalpy did not change with changing molding conditions. Therefore, the improvement in physical heat resistance with increasing mold temperature was likely caused by the decrease in the molecular orientation in the core layer. Analyzing the relaxation behavior of the molecular orientation suggested that increasing mold temperature reduced the number of oriented molecules with large deformation in the core layer.
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Affiliation(s)
- Kousaku Tao
- Osaka Research Institute of Industrial Science and Technology , Osaka-city , Japan
- Department of Material Science , School of Engineering, University of Shiga Prefecture , Hikone-city , Japan
| | - Koji Yamada
- Osaka Research Institute of Industrial Science and Technology , Osaka-city , Japan
| | - Seiji Higashi
- Osaka Research Institute of Industrial Science and Technology , Osaka-city , Japan
| | - Keitaro Kago
- Osaka Research Institute of Industrial Science and Technology , Osaka-city , Japan
| | - Shiho Kuwashiro
- Osaka Research Institute of Industrial Science and Technology , Osaka-city , Japan
| | - Hiroshi Hirano
- Osaka Research Institute of Industrial Science and Technology , Osaka-city , Japan
| | - Hiroki Takeshita
- Department of Material Science , School of Engineering, University of Shiga Prefecture , Hikone-city , Japan
| | - Katsuhisa Tokumitsu
- Department of Material Science , School of Engineering, University of Shiga Prefecture , Hikone-city , Japan
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4
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Kaser SJ, Christoff-Tempesta T, Uliassi LD, Cho Y, Ortony JH. Domain-Specific Phase Transitions in a Supramolecular Nanostructure. J Am Chem Soc 2022; 144:17841-17847. [PMID: 36125359 DOI: 10.1021/jacs.2c05908] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Understanding thermal phase behavior within nanomaterials can inform their rational design for medical technologies like drug delivery systems and vaccines, as well as for energy technologies and catalysis. This study resolves thermal phases of discrete domains within a supramolecular aramid amphiphile (AA) nanoribbon. Dynamics are characterized by X-band EPR spectroscopy of spin labels positioned at specific sites through the nanoribbon cross-section. The fitting of the electron paramagnetic resonance (EPR) line shapes reveals distinct conformational dynamics, with fastest dynamics at the surface water layer, intermediate dynamics within the flexible cationic head group domain, and slowest dynamics in the interior aramid domain. Measurement of conformational mobility as a function of temperature reveals first- and second-order phase transitions, with melting transitions observed in the surface and head group domains and a temperature-insensitive crystalline phase in the aramid domain. Arrhenius analysis yields activation energies of diffusion at each site. This work demonstrates that distinct thermal phase behaviors between adjacent nanodomains within a supramolecular nanostructure may be resolved and illustrates the utility of EPR spectroscopy for thermal phase characterization of nanostructures.
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Affiliation(s)
- Samuel J Kaser
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts02139, United States
| | - Ty Christoff-Tempesta
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts02139, United States
| | - Linnaea D Uliassi
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts02139, United States
| | - Yukio Cho
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts02139, United States
| | - Julia H Ortony
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts02139, United States
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5
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Miwa Y, Hasegawa K, Udagawa T, Shinke Y, Kutsumizu S. Effect of alkali metal cations on network rearrangement in polyisoprene ionomers. Phys Chem Chem Phys 2022; 24:17042-17049. [PMID: 35796495 DOI: 10.1039/d2cp01159j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effects of cations, Li+, Na+, and Cs+, on the structure of ionic aggregates and network rearrangement in carboxylated polyisoprene (PI) ionomers were studied. We found that network rearrangement via interaggregate hopping of metal carboxylates is improved with a decrease in cation size, even though density functional theory (DFT) calculation indicated the increase in the attractive interaction between metal carboxylates. At the same time, we also found that as the size of the cation decreases, the inclusion of the PI segment in the ionic aggregate increases. The DFT calculation suggested the cation-π interaction between the cation and double bonds in the PI segment as the cause for the inclusion. The inclusion of the PI segment with a low glass transition temperature (Tg) plasticizes the ionic aggregate and would sterically hinder the attractive interaction between metal carboxylates. In fact, the electron spin resonance measurement revealed a decrease in the Tg of the ionic aggregate with a decrease in cation size. Based on our findings, we proposed that the inclusion of PI segments in the ionic aggregate is the possible cause for the enhancement of network rearrangement in the carboxylated PI ionomers with a decrease in the cation size.
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Affiliation(s)
- Yohei Miwa
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan. .,PRESTO, Japan Science and Technology Agency, Japan
| | - Koki Hasegawa
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan.
| | - Taro Udagawa
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan.
| | - Yu Shinke
- The Yokohama Rubber Co., Ltd, Hiratsuka, 254-8601, Japan
| | - Shoichi Kutsumizu
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan.
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6
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Tang Z, Okazaki S. All-atomistic molecular dynamics study of the glass transition of amorphous polymers. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125044] [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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7
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Cheng H, Luo H, Hu Y, Tao S. Release kinetics as a key linkage between the occurrence of flame retardants in microplastics and their risk to the environment and ecosystem: A critical review. WATER RESEARCH 2020; 185:116253. [PMID: 32768659 DOI: 10.1016/j.watres.2020.116253] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 07/27/2020] [Accepted: 07/29/2020] [Indexed: 06/11/2023]
Abstract
The widely occurring debris of plastic materials, particularly microplastics, can be an important source of flame retardants, which are one of the main groups of chemicals added in the production of plastics from polymers. This review provides an overview on the use of flame retardants in plastic manufacturing, the kinetics of their releases from microplastics, the factors affecting their releases, and the potential environmental and ecosystem risk of the released flame retardants. The releases of flame retardants from microplastics typically involve three major steps: internal diffusion, mass transfer across the plastic-medium boundary layer, and diffusion in the environmental medium, while the overall mass transfer rate is commonly controlled by diffusion within the plastic matrix. The overall release rates of additive flame retardants from microplastics, which are dependent on the particle's geometry, can often be described by the Fick's Law. The physicochemical properties of flame retardant and plastic matrix, and ambient temperature all affect the release rate, which can be predicted with empirical and semi-empirical models. Weathering of microplastics, which reduces their particle sizes and likely disrupts their polymeric structures, can greatly accelerate the releases of flame retardants. Flame retardants could also be released directly from the microplastics ingested by aquatic organisms and seabirds, with physical and chemical digestion in the bodies significantly enhancing their release rates. Limited by the extremely slow diffusion in plastic matrices, the fluxes of flame retardants released from microplastics are very low, and are unlikely to pose significant risk to the ecosystem in general. More research is needed to characterize the mechanical, chemical, and biological processes that degrade microplastics and accelerate the releases of flame retardants and to model their release kinetics from microplastics, while efforts should also be made to develop environmentally benign flame retardants to ultimately minimize their risk to the environment and ecosystem.
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Affiliation(s)
- Hefa Cheng
- MOE Key Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
| | - Hang Luo
- MOE Key Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Yuanan Hu
- MOE Key Laboratory of Groundwater Circulation and EvolutioSchool of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
| | - Shu Tao
- MOE Key Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
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8
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Contreras J, Martínez G, Millán JL. Effect of Hydrogenation and Chlorination Reactions on the β Relaxation of Poly(Vinyl Chloride). J MACROMOL SCI B 2020. [DOI: 10.1080/00222348.2020.1796006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jesús Contreras
- Grupo de Polímeros, Departamento de Química. Facultad de Ciencias, Universidad de Los Andes, Mérida, Venezuela
| | - Gerardo Martínez
- C.S.I.C, Instituto de Ciencia y Tecnología de Polímeros, Madrid, Spain
| | - José Luis Millán
- C.S.I.C, Instituto de Ciencia y Tecnología de Polímeros, Madrid, Spain
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9
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Uddin MA, Yu H, Wang L, Naveed K, Haq F, Amin BU, Mehmood S, Nazir A, Xing Y, Shen D. Recent progress in
EPR
study of spin labeled polymers and spin probed polymer systems. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200039] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Md Alim Uddin
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Haojie Yu
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Li Wang
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Kaleem‐ur‐Rahman Naveed
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Fazal Haq
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Bilal Ul Amin
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Sahid Mehmood
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Ahsan Nazir
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Yusheng Xing
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
| | - Di Shen
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological EngineeringZhejiang University Hangzhou Zhejiang China
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10
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Effects of fatty acids having different alkyl tail lengths on rigidness of the shell region surrounding an ionic core and mechanical properties of poly(ethylene-co-methacrylic acid) ionomer/fatty acid blends. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122495] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Urakawa O, Yasue A. Glass Transition Behaviors of Poly (Vinyl Pyridine)/Poly (Vinyl Phenol) Revisited. Polymers (Basel) 2019; 11:E1153. [PMID: 31284499 PMCID: PMC6680477 DOI: 10.3390/polym11071153] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 07/01/2019] [Accepted: 07/01/2019] [Indexed: 11/23/2022] Open
Abstract
We examined the composition and molecular weight dependence of the glass transition temperature in detail for two types of hydrogen bonding miscible blends: poly (2-vinyl pyridine)/poly (vinyl phenol) (2VPy/VPh) and poly (4-vinyl pyridine)/poly (vinyl phenol) (4VPy/VPh). Regarding the functional form of the glass transition temperature, Tg, as a function of the weight fraction, we found a weak deviation from the Kwei equation for 2VPy/VPh blends. In contrast, such a deviation was not observed for the 4VPy/VPh blend. By relating the difference in the functional forms of Tg between the two blend systems to the difference in hydrogen bonding ability, we proposed a modified version of the Kwei equation. As for the interaction parameter, q in the Kwei equation, clear molecular weight dependence was observed for 2VPy/VPh blends: the lower the VPh molecular weight in the oligomer level, the higher the q values, suggesting the higher hydrogen bonding formability near the polymer chain ends than the middle part of a polymer chain.
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Affiliation(s)
- Osamu Urakawa
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
| | - Ayaka Yasue
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
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12
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Rentería‐Baltiérrez FY, Reyes‐Melo ME, López‐Walle B, García‐Loera AF. The effect of iron oxide nanoparticles on the mechanical relaxation of magnetic polymer hybrid films composed of a polystyrene matrix, a fractional calculus approach. J Appl Polym Sci 2019. [DOI: 10.1002/app.47840] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- F. Y. Rentería‐Baltiérrez
- Facultad de Ciencias QuímicasUniversidad Autónoma de Nuevo León, Avenida Universidad s/n Cd. Universitaria San Nicolás de los Garza Nuevo León 66455 Mexico
| | - M. E. Reyes‐Melo
- UANL‐FIME, Programa Doctoral en Ingeniería de Materiales, Avenida Universidad s/n Cd. Universitaria San Nicolás de los Garza Nuevo León 66455 Mexico
| | - B. López‐Walle
- UANL‐FIME, Programa Doctoral en Ingeniería de Materiales, Avenida Universidad s/n Cd. Universitaria San Nicolás de los Garza Nuevo León 66455 Mexico
| | - A. F. García‐Loera
- UANL‐FIME, Programa Doctoral en Ingeniería de Materiales, Avenida Universidad s/n Cd. Universitaria San Nicolás de los Garza Nuevo León 66455 Mexico
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13
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Vapaavuori J, Stimpson TC, Moran-Mirabal JM. Dynamically Evolving Surface Patterns through Light-Triggered Wrinkling Erasure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:875-881. [PMID: 30532978 DOI: 10.1021/acs.langmuir.8b03542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
For many applications, it is imperative that changes in polymer surface topography, especially periodic patterns, can be triggered on command by a well-defined remote signal. In this contribution, we report a light-induced cascade of changes in wrinkling wavelengths on thin polymer layers supported by an elastomeric substrate under tensile stress. Through the applied supramolecular design, the effect of varying the ratio of light-active and light-passive components can be easily assessed, and it is shown that both the cascade type as well as the rate of the progress of the dynamic light-induced changes can be tuned by this ratio as well as by the light intensity. Furthermore, for the reported phenomena to occur, nominally only every 20th polymer repeat unit needs to be occupied by a chromophore, which makes the conversion of the sub-nanometer photoisomerization reaction into 10 μm scale changes of periodic surface patterns extremely efficient.
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Affiliation(s)
- Jaana Vapaavuori
- Départment de Chimie , Université de Montréal , C. P. 6128, Succursale Centre-Ville, Montréal , Quebec H3C 3J7E , Canada
| | - Taylor C Stimpson
- Department of Chemical Engineering , McMaster University , 1280 Main Street West , Hamilton , Ontario L8S 4M1 , Canada
| | - Jose M Moran-Mirabal
- Department of Chemistry and Chemical Biology , McMaster University , 1280 Main Street West , Hamilton , Ontario L8S 4M1 , Canada
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14
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Miwa Y, Kohbara Y, Furukawa H, Kutsumizu S. The effects of local glass transition temperatures of ionic core–shell structures on the tensile behavior of sodium-neutralized poly(ethylene-co-methacrylic acid) ionomer/lauric acid blends. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.06.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Koerner H, Opsitnick E, Grabowski CA, Drummy LF, Hsiao MS, Che J, Pike M, Person V, Bockstaller MR, Meth JS, Vaia RA. Physical aging and glass transition of hairy nanoparticle assemblies. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/polb.23931] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hilmar Koerner
- Materials and Manufacturing Directorate; Air Force Research Laboratory, Wright Patterson Air Force Base; Ohio 45433-7750
| | - Elizabeth Opsitnick
- Materials and Manufacturing Directorate; Air Force Research Laboratory, Wright Patterson Air Force Base; Ohio 45433-7750
| | - Christopher A. Grabowski
- Materials and Manufacturing Directorate; Air Force Research Laboratory, Wright Patterson Air Force Base; Ohio 45433-7750
| | - Larry F. Drummy
- Materials and Manufacturing Directorate; Air Force Research Laboratory, Wright Patterson Air Force Base; Ohio 45433-7750
| | - Ming-Siao Hsiao
- Materials and Manufacturing Directorate; Air Force Research Laboratory, Wright Patterson Air Force Base; Ohio 45433-7750
| | - Justin Che
- Materials and Manufacturing Directorate; Air Force Research Laboratory, Wright Patterson Air Force Base; Ohio 45433-7750
| | - Megan Pike
- Materials and Manufacturing Directorate; Air Force Research Laboratory, Wright Patterson Air Force Base; Ohio 45433-7750
| | - Vernecia Person
- Department of Chemistry; Clark Atlanta University; SW Atlanta Georgia 30314
| | - Michael R. Bockstaller
- Department of Materials Science and Engineering; Carnegie Mellon University; Pittsburgh Pennsylvania 15213
| | - Jeff S. Meth
- DuPont Central Research and Development; E.I. DuPont De Nemours; Wilmington Delaware 19803
| | - Richard A. Vaia
- Materials and Manufacturing Directorate; Air Force Research Laboratory, Wright Patterson Air Force Base; Ohio 45433-7750
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16
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Ngai KL, Capaccioli S, Prevosto D, Wang LM. Coupling of Caged Molecule Dynamics to JG β-Relaxation II: Polymers. J Phys Chem B 2015; 119:12502-18. [DOI: 10.1021/acs.jpcb.5b07293] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. L. Ngai
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
- State
Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004 China
| | - S. Capaccioli
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
- Dipartimento
di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
| | - D. Prevosto
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
| | - Li-Min Wang
- State
Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004 China
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17
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Bordignon E, Nalepa AI, Savitsky A, Braun L, Jeschke G. Changes in the Microenvironment of Nitroxide Radicals around the Glass Transition Temperature. J Phys Chem B 2015; 119:13797-806. [DOI: 10.1021/acs.jpcb.5b04104] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Enrica Bordignon
- Laboratory
of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
- Berlin
Joint EPR Laboratories, Department of Experimental Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Anna I. Nalepa
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim an der Ruhr, Germany
| | - Anton Savitsky
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim an der Ruhr, Germany
| | - Lukas Braun
- Laboratory
of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
| | - Gunnar Jeschke
- Laboratory
of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
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Bose S, Schmid S, Larsen T, Sylvest Keller S, Boisen A, Almdal K. Micromechanical fast quasi-static detection of α and β relaxations with nanograms of polymer. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/polb.23745] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sanjukta Bose
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
| | - Silvan Schmid
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
| | - Tom Larsen
- Department of Mechanical Engineering; Stanford University; Stanford CA 94305
| | - Stephan Sylvest Keller
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
| | - Anja Boisen
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
| | - Kristoffer Almdal
- Department of Micro- and Nanotechnology; Technical University of Denmark, DTU Nanotech; DK-2800 Kongens Lyngby Denmark
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He SS, Strickler AL, Frank CW. A semi-interpenetrating network approach for dimensionally stabilizing highly-charged anion exchange membranes for alkaline fuel cells. CHEMSUSCHEM 2015; 8:1472-1483. [PMID: 25820199 DOI: 10.1002/cssc.201500133] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Indexed: 06/04/2023]
Abstract
There is a delicate balance between ion exchange capacity (IEC), conductivity, and dimensional stability in anion exchange membranes as higher charge content can lead to increased water uptake, causing excessive swelling and charge dilution. Using highly-charged benzyltrimethylammonium polysulfone (IEC=2.99 mEq g(-1) ) as a benchmark (which ruptured in water even at room temperature), we report the ability to dramatically decrease water uptake using a semi-interpenetrating network wherein we reinforced the linear polyelectrolyte with a crosslinked poly(styrene-co-divinylbenzene) network. These membranes show enhanced dimensional stability as a result of lower water uptake (75 % vs. 301 % at 25 °C) while maintaining excellent hydroxide conductivity (up to 50 mS cm(-1) at 25 °C). These improvements produced an enhanced alkaline fuel cell capable of generating 236 mW cm(-2) peak power density at 80 °C. This method is easily adaptable and can be a viable strategy for stabilizing existing systems.
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Affiliation(s)
- Steve S He
- Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, CA 94305 (USA). ,
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20
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Miwa Y, Urakawa O, Nobukawa S, Kutsumizu S. Selective determination of glass transition temperature and vibrational properties at the chain end of polystyrene by Fourier transform infrared measurement in combination with deuterium-labeling. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.01.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Miwa Y, Udagawa T, Urakawa O, Nobukawa S, Kutsumizu S. Rapid Stretching Vibration at the Polymer Chain End. ACS Macro Lett 2014; 3:126-129. [PMID: 35590491 DOI: 10.1021/mz400628b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Stretching vibrations of aliphatic C-D bonds at the chain end and midchain site of partially deuterated polystyrene (PS) were determined by Fourier transform infrared (FT-IR) spectroscopy. It was first found that the stretching vibration at the chain end is more rapid compared to that at the midchain site in the glassy bulk state. The difference in the frequencies of the stretching vibrations at the chain end and midchain site changed little even when the PS was dissolved in toluene. Moreover, the DFT vibrational frequency calculations showed that the C-D bonds at the end site intrinsically have higher vibrational frequency because of lower intramolecular interactions at the chain end. From these results, it was concluded that the main origin for the local rapid stretching vibration at the chain end is not intermolecular effects but reduced intramolecular interactions induced by the discontinuity of the repeating unit at the chain end.
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Affiliation(s)
- Yohei Miwa
- Department
of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
| | - Taro Udagawa
- Department
of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
| | - Osamu Urakawa
- Department
of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Shogo Nobukawa
- School
of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Shoichi Kutsumizu
- Department
of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
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Miwa Y, Kondo T, Kutsumizu S. Subnanoscopic Mapping of Glass Transition Temperature around Ionic Multiplets in Sodium-Neutralized Poly(ethylene-random-methacrylic acid) Ionomer. Macromolecules 2013. [DOI: 10.1021/ma401035r] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yohei Miwa
- Department of Chemistry, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
| | - Tomoyo Kondo
- Department of Chemistry, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
| | - Shoichi Kutsumizu
- Department of Chemistry, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
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23
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Miwa Y, Yamamoto K. Simple and Highly Sensitive Measurement Method for Detection of Glass Transition Temperatures of Polymers: Application of ESR Power Saturation Phenomenon with Conventional Spin-Probe Technique. J Phys Chem B 2012; 116:9277-84. [DOI: 10.1021/jp305433k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yohei Miwa
- Department of Chemistry, Faculty
of Engineering, Gifu University, Yanagido,
Gifu 501-1193, Japan
| | - Katsuhiro Yamamoto
- Department
of Materials Science
and Technology, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
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