301
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Pastore R, Raos G. Glassy dynamics of a polymer monolayer on a heterogeneous disordered substrate. SOFT MATTER 2015; 11:8083-8091. [PMID: 26337758 DOI: 10.1039/c5sm01440a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present molecular dynamics simulations of a polymer monolayer on randomly functionalized surfaces that are characterized by different fractions of weakly and strongly attractive sites. We show that the dynamics slow-down upon cooling resembles that of a strong glass-forming liquid. Indeed, the mean-square displacements show an increasingly lasting subdiffusive behaviour before the diffusive regime, with signs of Fickian yet not Gaussian diffusion, and the dynamic correlation functions exhibit a stretched exponential decay. The glassy dynamics of this relatively dilute system is dominated by the interaction of the polymer with the substrate and becomes more marked when the substrate composition is heterogeneous. Accordingly, the estimated glass transition temperature shows a non-monotic dependence on surface composition, in agreement with previous results for the activation energy and with an analysis of the potential energy landscape experienced by the polymer beads. Our findings are relevant to the description of polymer-surface adhesion and friction and the development of polymer nanocomposites with tailored structural and mechanical properties.
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Affiliation(s)
- Raffaele Pastore
- CNR-SPIN, Dipartimento di Scienze Fisiche, University of Napoli Federico II, Italy.
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302
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Neikirk CC, Chung JW, Priestley RD. Modification of mechanical properties in polymer nanocomposites by the incorporation of specific self-complementary hydrogen bonding interactions. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.10.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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303
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Ruan Y, Gao L, Yao D, Zhang K, Zhang B, Chen Y, Liu CY. Polymer-Grafted Nanoparticles with Precisely Controlled Structures. ACS Macro Lett 2015; 4:1067-1071. [PMID: 35614805 DOI: 10.1021/acsmacrolett.5b00408] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polymer-tethered nanoparticles with different geometric shapes are very useful fillers of polymer nanocomposites. Herein, a universal approach for the fabrication of such nanoparticles with precisely controlled shape and composition is reported. By microphase separation of poly(3-(triethoxysilyl)propyl methacrylate)-block-polystyrene (PTEPM-b-PS) in the presence of oligomers, o-TEPM (oT) and/or o-S (oS), followed by cross-linking and dispersion in PS solvent, precisely tailored PS-grafted nanoparticles were prepared. These particles include those with varied shapes but identical PS shells, particles with varied core sizes but the same PS shell, and particles with fixed shapes but varied PS shells. These particles are ideal model nanofillers to study the dynamics and reinforced mechanism of polymer nanocomposites.
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Affiliation(s)
- Yingbo Ruan
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Engineering Plastics, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
| | - Lei Gao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Polymer Physics and Chemistry, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
| | - Dongdong Yao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Polymer Physics and Chemistry, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
| | - Ke Zhang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Polymer Physics and Chemistry, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
| | - Baoqing Zhang
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Engineering Plastics, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
| | - Yongming Chen
- Key
Laboratory for Polymeric Composite and Functional Materials of Ministry
of Education, Department of Polymer and Materials Sciences, School
of Chemistry and Chemical Engineering, Sun Yat-Sen University, NO.
135, Xingang Xi Road, Guangzhou 510275, China
| | - Chen-Yang Liu
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Engineering Plastics, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
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304
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Qin X, Xia W, Sinko R, Keten S. Tuning Glass Transition in Polymer Nanocomposites with Functionalized Cellulose Nanocrystals through Nanoconfinement. NANO LETTERS 2015; 15:6738-6744. [PMID: 26340693 DOI: 10.1021/acs.nanolett.5b02588] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cellulose nanocrystals (CNCs) exhibit impressive interfacial and mechanical properties that make them promising candidates to be used as fillers within nanocomposites. While glass-transition temperature (Tg) is a common metric for describing thermomechanical properties, its prediction is extremely difficult as it depends on filler surface chemistry, volume fraction, and size. Here, taking CNC-reinforced poly(methyl-methacrylate) (PMMA) nanocomposites as a relevant model system, we present a multiscale analysis that combines atomistic molecular dynamics (MD) surface energy calculations with coarse-grained (CG) simulations of relaxation dynamics near filler-polymer interfaces to predict composite properties. We discover that increasing the volume fraction of CNCs results in nanoconfinement effects that lead to an appreciation of the composite Tg provided that strong interfacial interactions are achieved, as in the case of TEMPO-mediated surface modifications that promote hydrogen bonding. The upper and lower bounds of shifts in Tg are predicted by fully accounting for nanoconfinement and interfacial properties, providing new insight into tuning these aspects in nanocomposite design. Our multiscale, materials-by-design framework is validated by recent experiments and breaks new ground in predicting, without any empirical parameters, key structure-property relationships for nanocomposites.
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Affiliation(s)
- Xin Qin
- Department of Mechanical Engineering and ‡Department of Civil and Environmental Engineering, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3109, United States
| | - Wenjie Xia
- Department of Mechanical Engineering and ‡Department of Civil and Environmental Engineering, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3109, United States
| | - Robert Sinko
- Department of Mechanical Engineering and ‡Department of Civil and Environmental Engineering, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3109, United States
| | - Sinan Keten
- Department of Mechanical Engineering and ‡Department of Civil and Environmental Engineering, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3109, United States
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305
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Thaithae W, Antonio C, Wattanachai P. Properties characterisation of polycarbonate and multi-walled carbon nanotubes composites prepared by solution technique. ASIA-PAC J CHEM ENG 2015. [DOI: 10.1002/apj.1940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wachirawut Thaithae
- Bayer Thai Company Limited; No.4-4/1, I-8 Road, Map Ta Phut Industrial Estate; Map Ta Phut, Muang Rayong 21150 Thailand
| | - Christian Antonio
- Julius Kruttschnitt Mineral Research Centre, Sustainable Minerals Institute; University of Queensland; 40 Isles Road, Indooroopilly Brisbane Qld 4068 Australia
| | - Piyachat Wattanachai
- Department of Chemical Engineering, Faculty of Engineering; Burapha University; 169 Long-Hard Bangsaen Road, Saen Sook, Muang Chonburi 20131 Thailand
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306
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Serenko OA, Roldugin VI, Novozhilova NA, Soldatov MA, Nikiforova GG, Mironova MV, Ilyin SO, Kulichikhin VG, Muzafarov AM. Phase structure and properties of blends based on polystyrene and carbosilane dendrimers. POLYMER SCIENCE SERIES A 2015. [DOI: 10.1134/s0965545x15050156] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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307
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Banc A, Genix AC, Dupas C, Sztucki M, Schweins R, Appavou MS, Oberdisse J. Origin of Small-Angle Scattering from Contrast-Matched Nanoparticles: A Study of Chain and Filler Structure in Polymer Nanocomposites. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01424] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Amélie Banc
- Laboratoire
Charles Coulomb (L2C), UMR 5221 CNRS, Université de Montpellier, F-34095 Montpellier, France
| | - Anne-Caroline Genix
- Laboratoire
Charles Coulomb (L2C), UMR 5221 CNRS, Université de Montpellier, F-34095 Montpellier, France
| | - Christelle Dupas
- Laboratoire
Charles Coulomb (L2C), UMR 5221 CNRS, Université de Montpellier, F-34095 Montpellier, France
| | - Michael Sztucki
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, BP 220, F-38043, Grenoble Cedex 9, France
| | - Ralf Schweins
- Institut Laue-Langevin, 71 Avenue
des Martyrs, CS 20 156, F-38042 Grenoble Cedex 9, France
| | - Marie-Sousai Appavou
- Forschungszentrum
Jülich, Outstation at MLZ, Jülich Centre for Neutron Science JCNS, D-85747 Garching, Germany
| | - Julian Oberdisse
- Laboratoire
Charles Coulomb (L2C), UMR 5221 CNRS, Université de Montpellier, F-34095 Montpellier, France
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308
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Baeza GP, Oberdisse J, Alegria A, Saalwächter K, Couty M, Genix AC. Depercolation of aggregates upon polymer grafting in simplified industrial nanocomposites studied with dielectric spectroscopy. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.07.045] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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309
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310
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Imel AE, Dadmun MD. The impact of fullerenes on the ordering of polyacrylonitrile during nanocomposites formation. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.08.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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311
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Iyer KA, Flores AM, Torkelson JM. Comparison of polyolefin biocomposites prepared with waste cardboard, microcrystalline cellulose, and cellulose nanocrystals via solid-state shear pulverization. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.08.029] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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312
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Zaragoza J, Babhadiashar N, O’Brien V, Chang A, Blanco M, Zabalegui A, Lee H, Asuri P. Experimental Investigation of Mechanical and Thermal Properties of Silica Nanoparticle-Reinforced Poly(acrylamide) Nanocomposite Hydrogels. PLoS One 2015; 10:e0136293. [PMID: 26301505 PMCID: PMC4547727 DOI: 10.1371/journal.pone.0136293] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 07/31/2015] [Indexed: 11/22/2022] Open
Abstract
Current studies investigating properties of nanoparticle-reinforced polymers have shown that nanocomposites often exhibit improved properties compared to neat polymers. However, over two decades of research, using both experimental studies and modeling analyses, has not fully elucidated the mechanistic underpinnings behind these enhancements. Moreover, few studies have focused on developing an understanding among two or more polymer properties affected by incorporation of nanomaterials. In our study, we investigated the elastic and thermal properties of poly(acrylamide) hydrogels containing silica nanoparticles. Both nanoparticle concentration and size affected hydrogel properties, with similar trends in enhancements observed for elastic modulus and thermal diffusivity. We also observed significantly lower swellability for hydrogel nanocomposites relative to neat hydrogels, consistent with previous work suggesting that nanoparticles can mediate pseudo crosslinking within polymer networks. Collectively, these results indicate the ability to develop next-generation composite materials with enhanced mechanical and thermal properties by increasing the average crosslinking density using nanoparticles.
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Affiliation(s)
- Josergio Zaragoza
- Department of Bioengineering, Santa Clara University, Santa Clara, California, United States of America
| | - Nasim Babhadiashar
- Department of Bioengineering, Santa Clara University, Santa Clara, California, United States of America
| | - Victor O’Brien
- Department of Bioengineering, Santa Clara University, Santa Clara, California, United States of America
| | - Andrew Chang
- Department of Bioengineering, Santa Clara University, Santa Clara, California, United States of America
| | - Matthew Blanco
- Department of Bioengineering, Santa Clara University, Santa Clara, California, United States of America
| | - Aitor Zabalegui
- Department of Mechanical Engineering, Santa Clara University, Santa Clara, California, United States of America
| | - Hohyun Lee
- Department of Mechanical Engineering, Santa Clara University, Santa Clara, California, United States of America
- * E-mail: (HL); (PA)
| | - Prashanth Asuri
- Department of Bioengineering, Santa Clara University, Santa Clara, California, United States of America
- * E-mail: (HL); (PA)
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313
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Stephanou PS. How the flow affects the phase behaviour and microstructure of polymer nanocomposites. J Chem Phys 2015; 142:064901. [PMID: 25681937 DOI: 10.1063/1.4907363] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We address the issue of flow effects on the phase behaviour of polymer nanocomposite melts by making use of a recently reported Hamiltonian set of evolution equations developed on principles of non-equilibrium thermodynamics. To this end, we calculate the spinodal curve, by computing values for the nanoparticle radius as a function of the polymer radius-of-gyration for which the second derivative of the generalized free energy of the system becomes zero. Under equilibrium conditions, we recover the phase diagram predicted by Mackay et al. [Science 311, 1740 (2006)]. Under non-equilibrium conditions, we account for the extra terms in the free energy due to changes in the conformations of polymer chains by the shear flow. Overall, our model predicts that flow enhances miscibility, since the corresponding miscibility window opens up for non-zero shear rate values.
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Affiliation(s)
- Pavlos S Stephanou
- Department of Mathematics and Statistics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
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314
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Shyu TC, Damasceno PF, Dodd PM, Lamoureux A, Xu L, Shlian M, Shtein M, Glotzer SC, Kotov NA. A kirigami approach to engineering elasticity in nanocomposites through patterned defects. NATURE MATERIALS 2015; 14:785-9. [PMID: 26099109 DOI: 10.1038/nmat4327] [Citation(s) in RCA: 232] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Accepted: 05/08/2015] [Indexed: 05/19/2023]
Abstract
Efforts to impart elasticity and multifunctionality in nanocomposites focus mainly on integrating polymeric and nanoscale components. Yet owing to the stochastic emergence and distribution of strain-concentrating defects and to the stiffening of nanoscale components at high strains, such composites often possess unpredictable strain-property relationships. Here, by taking inspiration from kirigami—the Japanese art of paper cutting—we show that a network of notches made in rigid nanocomposite and other composite sheets by top-down patterning techniques prevents unpredictable local failure and increases the ultimate strain of the sheets from 4 to 370%. We also show that the sheets' tensile behaviour can be accurately predicted through finite-element modelling. Moreover, in marked contrast to other stretchable conductors, the electrical conductance of the stretchable kirigami sheets is maintained over the entire strain regime, and we demonstrate their use to tune plasma-discharge phenomena. The unique properties of kirigami nanocomposites as plasma electrodes open up a wide range of novel technological solutions for stretchable electronics and optoelectronic devices, among other application possibilities.
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Affiliation(s)
- Terry C Shyu
- 1] Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA [2] Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Pablo F Damasceno
- Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Paul M Dodd
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Aaron Lamoureux
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Lizhi Xu
- 1] Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA [2] Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, USA [3] Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Matthew Shlian
- Penny W. Stamps School of Art and Design, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Max Shtein
- 1] Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA [2] Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA [3] Penny W. Stamps School of Art and Design, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Sharon C Glotzer
- 1] Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA [2] Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, USA [3] Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109, USA [4] Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Nicholas A Kotov
- 1] Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA [2] Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109, USA [3] Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109, USA [4] Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
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315
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Leng J, Purohit PJ, Kang N, Wang DY, Falkenhagen J, Emmerling F, Thünemann AF, Schönhals A. Structure–property relationships of nanocomposites based on polylactide and MgAl layered double hydroxides. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.05.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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316
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Ali U, Karim KJBA, Buang NA. A Review of the Properties and Applications of Poly (Methyl Methacrylate) (PMMA). POLYM REV 2015. [DOI: 10.1080/15583724.2015.1031377] [Citation(s) in RCA: 312] [Impact Index Per Article: 34.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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317
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Lin YC, Chen CY, Chen HL, Hashimoto T, Chen SA, Li YC. Hierarchical self-assembly of nanoparticles in polymer matrix and the nature of the interparticle interaction. J Chem Phys 2015; 142:214905. [DOI: 10.1063/1.4921567] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yu-Chiao Lin
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chun-Yu Chen
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Hsin-Lung Chen
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Takeji Hashimoto
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
- Quantum Beam Science Center, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan and Kyoto University, Kyoto 606-6501, Japan
| | - Show-An Chen
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yen-Cheng Li
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 300, Taiwan
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318
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Klonos P, Sulym I, Kyriakos K, Vangelidis I, Zidropoulos S, Sternik D, Borysenko M, Kyritsis A, Deryło-Marczewska A, Gun'ko V, Pissis P. Interfacial phenomena in core–shell nanocomposites of PDMS adsorbed onto low specific surface area fumed silica nanooxides: Effects of surface modification. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.05.017] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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319
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Importance of superior dispersion versus filler surface modification in producing robust polymer nanocomposites: The example of polypropylene/nanosilica hybrids. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.05.015] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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320
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Lan T, Torkelson JM. Substantial spatial heterogeneity and tunability of glass transition temperature observed with dense polymer brushes prepared by ARGET ATRP. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.03.047] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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321
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Jancar J, Hoy RS, Jancarova E, Zidek J. Effect of temperature, strain rate and particle size on the yield stresses and post-yield strain softening of PMMA and its composites. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.03.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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322
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Duncan B, Landis RF, Jerri HA, Normand V, Benczédi D, Ouali L, Rotello VM. Hybrid organic-inorganic colloidal composite 'sponges' via internal crosslinking. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:1302-1309. [PMID: 25381874 DOI: 10.1002/smll.201401753] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 09/19/2014] [Indexed: 06/04/2023]
Abstract
An effective method for the generation of hybrid organic-inorganic nanocomposite microparticles featuring controlled size and high structural stability is presented. In this process, an oil-in-water Pickering emulsion is formed using hydrophilic amine-functionalized silica nanoparticles. Covalent modification using a hydrophobic maleic anhydride copolymer then alters nanoparticle wettability during crosslinking, causing a core-shell to nanocomposite structural reorganization of the assemblies. The resulting porous nanocomposites maintain discrete microparticle structures and retain payloads in their oil phase even when incubated in competitive solvents such as ethanol.
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Affiliation(s)
- Bradley Duncan
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts, 01003, USA
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323
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Interphase vs confinement in starch-clay bionanocomposites. Carbohydr Polym 2015; 117:746-752. [DOI: 10.1016/j.carbpol.2014.10.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 09/05/2014] [Accepted: 10/17/2014] [Indexed: 11/20/2022]
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324
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Kim B, Choi J, Yang S, Yu S, Cho M. Influence of crosslink density on the interfacial characteristics of epoxy nanocomposites. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.01.043] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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325
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Begam N, Chandran S, Biswas N, Basu JK. Kinetics of dispersion of nanoparticles in thin polymer films at high temperature. SOFT MATTER 2015; 11:1165-1173. [PMID: 25560367 DOI: 10.1039/c4sm02383h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the first detailed study of the kinetics of dispersion of nanoparticles in thin polymer films using temperature dependent in situ X-ray scattering measurements. We show a comparably enhanced dispersion at higher temperatures for systems which are otherwise phase segregated at room temperature. Detailed analysis of the time dependent X-ray reflectivity and diffuse scattering data allows us to explore the out-of-plane and in-plane mobility of the nanoparticles in the polymer films. While the out-of-plane motion is diffusive with a diffusion coefficient almost two orders of magnitude lower than that expected in bulk polymer, the in-plane one is found to be super-diffusive resulting in significantly larger in-plane displacement at similar time scales. We discuss the origin of the observed highly anisotropic motion of nanoparticles due to their slaved motion with respect to the anisotropic chain orientation and consequent diffusivity anisotropy of matrix chains. We also suggest strategies to utilize these observations to kinetically improve dispersion in otherwise thermodynamically segregated polymer nanocomposite films.
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Affiliation(s)
- Nafisa Begam
- Department of Physics, Indian Institute of Science, Bangalore, 560 012, India.
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326
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Hattemer GD, Arya G. Viscoelastic Properties of Polymer-Grafted Nanoparticle Composites from Molecular Dynamics Simulations. Macromolecules 2015. [DOI: 10.1021/ma502086c] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Gregory D. Hattemer
- Department
of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, Mail Code 0448, La Jolla, California 92093, United States
| | - Gaurav Arya
- Department
of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, Mail Code 0448, La Jolla, California 92093, United States
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327
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White KL, Wong M, Li P, Miyamoto M, Higaki Y, Takahara A, Sue HJ. Interlayer structure and self-healing in suspensions of brush-stabilized nanoplatelets with smectic order. SOFT MATTER 2015; 11:954-971. [PMID: 25519712 DOI: 10.1039/c4sm01855a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We have investigated the rheology of an uncured epoxy fluid containing high aspect ratio (length/thickness ≈ 160) α-zirconium phosphate (ZrP) nanoplatelets with smectic order. The nanoplatelets were exfoliated into monocrystalline sheets with uniform thickness using a monoamine-terminated oligomer. The oligomers were densely grafted to the plate surfaces and behave as a molecular brush. Suspensions containing ∼ 2 vol.% ZrP and above show liquid crystalline order with scattering peaks characteristic of a smectic (layered) mesophase. At much higher loading, ∼ 4 vol.% ZrP, there is a sharp transition in visual appearance, steady shear rheology, and linear and non-linear viscoelasticity that is attributed to the reversible interdigitation of oligomer chains between closely spaced layers. The oligomers are proposed to serve as inter-lamellar bridges that store elastic stresses for intermediate rates of deformation, but are able to relax on longer time scales. Under steady shearing conditions, the smectic suspensions with "overlapped" microstructure show a discontinuous flow curve characteristic of shear banding that is attributed to the dynamic pull-out of oligomer chains from the overlap region. At high shear rates, the limiting viscosity of the concentrated suspensions is on the same order of magnitude as the unfilled suspending fluid. When the rate of deformation is reduced below a critical time scale, the original network strength, and corresponding microstructure, is recovered through a passive self-healing process. The unique combination of concentration-dependent yield stress, low post-yield viscosity, and self-healing is potentially useful for various applications in the liquid state, and desirable for scalable processing of nanocomposite materials for structural applications.
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Affiliation(s)
- K L White
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, 819-0395, Japan
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328
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Interfacial interactions and complex segmental dynamics in systems based on silica-polydimethylsiloxane core–shell nanoparticles: Dielectric and thermal study. POLYMER 2015. [DOI: 10.1016/j.polymer.2014.12.037] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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329
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Baeza GP, Oberdisse J, Alegria A, Couty M, Genix AC. A high-temperature dielectric process as a probe of large-scale silica filler structure in simplified industrial nanocomposites. Phys Chem Chem Phys 2015; 17:1660-6. [PMID: 25436476 DOI: 10.1039/c4cp04597a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The existence of two independent filler-dependent high-temperature Maxwell-Wagner-Sillars (MWS) dielectric processes is demonstrated and characterized in detail in silica-filled styrene-butadiene (SB) industrial nanocomposites of simplified composition using Broadband Dielectric Spectroscopy (BDS). The uncrosslinked samples are made with 140 kg mol(-1) SB-chains, half of which carry a single graftable end-function (50% D3), and Zeosil 1165 MP silica incorporated by solid-phase mixing. While one high-temperature process is known to exist in other systems, the dielectric properties of a new silica-related process - strength, relaxation time, and activation energy - have been evidenced and described as a function of silica volume fraction and temperature. In particular, it is shown that its strength follows a percolation behavior as observed with the ionic conductivity and rheology. Moreover, activation energies show the role of polymer layers separating aggregates even when they are percolated. Apart from simultaneous characterization over a broad frequency range up to local polymer and silanol dynamics, it is believed that such high-temperature BDS-measurements can thus be used to detect reorganizations in structurally-complex silica nanocomposites. Moreover, they should contribute to a better identification of dynamical processes via the described sensitivity to structure in such systems.
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Affiliation(s)
- Guilhem P Baeza
- Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France.
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330
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Tadano T, Zhu R, Muroga Y, Hoshi T, Sasaki D, Hagiwara T, Sawaguchi T. Characteristics of novel transparent poly(methyl methacrylate)/silica nanoparticle hybrid film prepared based on entanglement-agglomeration transition mechanism. Polym J 2015. [DOI: 10.1038/pj.2014.130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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331
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De Nicola A, Avolio R, Della Monica F, Gentile G, Cocca M, Capacchione C, Errico ME, Milano G. Rational design of nanoparticle/monomer interfaces: a combined computational and experimental study of in situ polymerization of silica based nanocomposites. RSC Adv 2015. [DOI: 10.1039/c5ra13154e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Methylmethacrylate monomers/silica nanoparticles interfaces are investigated using simulations and experiments. This allowed to understand and to control interfaces structures. On this basis, an improved in situ polymerization process is proposed.
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Affiliation(s)
- Antonio De Nicola
- Dipartimento di Chimica e Biologia and NANOMATES
- Research Centre for NANOMAterials and nanotechnology at Università di Salerno
- Fisciano
- Italy
| | - Roberto Avolio
- Institute for Polymers
- Composites and Biomaterials (IPCB-CNR)
- Pozzuoli
- Italy
| | - Francesco Della Monica
- Dipartimento di Chimica e Biologia and NANOMATES
- Research Centre for NANOMAterials and nanotechnology at Università di Salerno
- Fisciano
- Italy
| | - Gennaro Gentile
- Institute for Polymers
- Composites and Biomaterials (IPCB-CNR)
- Pozzuoli
- Italy
| | | | - Carmine Capacchione
- Dipartimento di Chimica e Biologia and NANOMATES
- Research Centre for NANOMAterials and nanotechnology at Università di Salerno
- Fisciano
- Italy
| | | | - Giuseppe Milano
- Dipartimento di Chimica e Biologia and NANOMATES
- Research Centre for NANOMAterials and nanotechnology at Università di Salerno
- Fisciano
- Italy
- IMAST Scarl-Technological District in Polymer and Composite Engineering
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332
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Li Y, Wang L, Natarajan B, Tao P, Benicewicz BC, Ullal C, Schadler LS. Bimodal “matrix-free” polymer nanocomposites. RSC Adv 2015. [DOI: 10.1039/c4ra16939e] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
“Matrix-free” nanocomposites with a bimodal population of polymer brushes for optimizing filler loading while maintaining controlled dispersion.
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Affiliation(s)
- Ying Li
- Department of Materials Science and Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
| | - Lei Wang
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Bharath Natarajan
- Department of Materials Science and Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
| | - Peng Tao
- Department of Materials Science and Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
- State Key Laboratory of Metal Matrix Composites
| | - Brian C. Benicewicz
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Chaitanya Ullal
- Department of Materials Science and Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
| | - Linda S. Schadler
- Department of Materials Science and Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
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333
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Govindaraj D, Rajan M, Munusamy MA, Balakumaran MD, Kalaichelvan PT. Osteoblast compatibility of minerals substituted hydroxyapatite reinforced poly(sorbitol sebacate adipate) nanocomposites for bone tissue application. RSC Adv 2015. [DOI: 10.1039/c5ra02419f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The main focus of this investigation is to explore novel minerals (M) substituted hydroxyapatite (M-HAP) as reinforcing agents to strengthen poly(sorbitol sebacate adipate) (PSSA), a biodegradable polymer for soft and hard tissue applications.
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Affiliation(s)
- Dharman Govindaraj
- Department of Natural Products Chemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai 625021
- India
| | - Mariappan Rajan
- Department of Natural Products Chemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai 625021
- India
| | - Murugan A. Munusamy
- Department of Botany and Microbiology
- College of Science
- King Saud University
- Riyadh
- Kingdom of Saudi Arabia
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334
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Li CY, Luo MB, Huang JH, Li H. Equilibrium and dynamical properties of polymer chains in random medium filled with randomly distributed nano-sized fillers. Phys Chem Chem Phys 2015; 17:31877-86. [DOI: 10.1039/c5cp06189j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of randomly distributed nano-sized fillers on the equilibrium and dynamical properties of linear polymers is studied by using off-lattice Monte Carlo simulation.
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Affiliation(s)
- Chao-Yang Li
- Department of Physics
- Hangzhou Normal University
- Hangzhou 310036
- China
| | - Meng-Bo Luo
- Department of Physics
- Zhejiang University
- Hangzhou 310027
- China
| | - Jian-Hua Huang
- Department of Chemistry
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Hong Li
- Department of Physics
- Wenzhou University
- Wenzhou 325035
- China
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335
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Casalegno M, Kotowski D, Bernardi A, Luzzati S, Po R, Raos G. The effect of donor content on the efficiency of P3HT:PCBM bilayers: optical and photocurrent spectral data analyses. Phys Chem Chem Phys 2015; 17:2447-56. [DOI: 10.1039/c4cp03827d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A numerical analysis of optical absorption and photocurrent data reveals extensive interdiffusion in P3HT:PCBM bilayer devices.
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Affiliation(s)
- Mosé Casalegno
- Dipartimento di Chimica
- Materiali e Ingegneria Chimica “G. Natta”
- Politecnico di Milano
- 20131 Milano
- Italy
| | - Dariusz Kotowski
- Istituto per lo Studio delle Macromolecole
- Consiglio Nazionale delle Ricerche
- 20133 Milano
- Italy
| | - Andrea Bernardi
- Research Center for Non-Conventional Energies
- Istituto ENI Donegani
- Eni S.p.A
- 28100 Novara
- Italy
| | - Silvia Luzzati
- Istituto per lo Studio delle Macromolecole
- Consiglio Nazionale delle Ricerche
- 20133 Milano
- Italy
| | - Riccardo Po
- Research Center for Non-Conventional Energies
- Istituto ENI Donegani
- Eni S.p.A
- 28100 Novara
- Italy
| | - Guido Raos
- Dipartimento di Chimica
- Materiali e Ingegneria Chimica “G. Natta”
- Politecnico di Milano
- 20131 Milano
- Italy
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336
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Sarkar B, Alexandridis P. Block copolymer–nanoparticle composites: Structure, functional properties, and processing. Prog Polym Sci 2015. [DOI: 10.1016/j.progpolymsci.2014.10.009] [Citation(s) in RCA: 180] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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337
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Ghasemirad S, Mohammadi N. Active layer thickness across the crack plane and fracture energy consumption in polymer nanocomposites: adhesion against tear strength. RSC Adv 2015. [DOI: 10.1039/c5ra21937j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The active layer thickness of the nanocomposites in tear strength tests was 2 orders of magnitude higher than in adhesion tests.
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Affiliation(s)
- S. Ghasemirad
- Nano and Smart Polymers Centre of Excellence
- Department of Polymer Engineering and Colour Technology
- Amirkabir University of Technology
- Tehran
- Iran
| | - N. Mohammadi
- Nano and Smart Polymers Centre of Excellence
- Department of Polymer Engineering and Colour Technology
- Amirkabir University of Technology
- Tehran
- Iran
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338
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Xu C, Jiang L, Guan A, Lin Y, Wu G. Tailoring the Viscoelasticity of HEMA-Functionalized Styrene-Acrylate Copolymers Using Coagulants. Ind Eng Chem Res 2014. [DOI: 10.1021/ie502573h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cheng Xu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, PR China
| | - Lili Jiang
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, PR China
| | - Aiguo Guan
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, PR China
| | - Yu Lin
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, PR China
| | - Guozhang Wu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, PR China
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339
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She X, He C, Peng Z, Kong L. Molecular-level dispersion of graphene into epoxidized natural rubber: Morphology, interfacial interaction and mechanical reinforcement. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.10.054] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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340
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Ghasemirad S, Mohammadi N. How do soft nanoparticles affect temperature-induced nonlinearity of a UCST copolymer blend? Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3446-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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341
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Controlled accommodation of metal nanostructures within the matrices of polymer architectures through solution-based synthetic strategies. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2014.07.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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342
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343
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Baeza GP, Genix AC, Degrandcourt C, Gummel J, Couty M, Oberdisse J. Mechanism of aggregate formation in simplified industrial silica styrene-butadiene nanocomposites: effect of chain mass and grafting on rheology and structure. SOFT MATTER 2014; 10:6686-6695. [PMID: 25060535 DOI: 10.1039/c4sm01095g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The formation of aggregates in simplified industrial styrene-butadiene nanocomposites with silica filler has been studied using a recent model based on a combination of electron microscopy, computer simulations, and small-angle X-ray scattering. The influence of the chain mass (40 to 280 kg mol(-1), PI < 1.1), which sets the linear rheology of the samples, was investigated for a low (9.5 vol%) and high (19 vol%) silica volume fraction. 50% of the chains bear a single graftable end-group, and it is shown that the (chain-mass dependent) grafting density is the structure-determining parameter. A model unifying all available data on this system is proposed and used to determine a critical aggregate grafting density. The latter is found to be closely related to the mushroom-to-brush transition of the grafted layer. To our best knowledge, this is the first comprehensive evidence for the control of the complex nanoparticle aggregate structure in nanocomposites of industrial relevance by the physical parameters of the grafted layer.
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Affiliation(s)
- Guilhem P Baeza
- Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34 095, Montpellier, France.
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344
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Palli B, Padmanabhan V. Chain flexibility for tuning effective interactions in blends of polymers and polymer-grafted nanoparticles. SOFT MATTER 2014; 10:6777-6782. [PMID: 25074671 DOI: 10.1039/c4sm00991f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present molecular dynamics simulations of polymer-grafted nanoparticles in a homopolymer matrix to demonstrate the effect of chain flexibility on the potential of mean force (PMF) between various species in the nanocomposite. For a relatively high grafting density of Σg = 0.76 chains/σp(2) (where σp is the polymer monomer diameter), when the brush chain length is significantly smaller than (<∼ 1/4) the matrix chain length, the brushes exhibit autophobic dewetting with matrix polymers resulting in a strong attractive well in the particle-particle PMF. As the chain flexibility is decreased, we observe significant changes in particle-particle and particle-matrix PMFs that are strongly coupled with the length (or molecular weight) of grafted chains. For low molecular weight grafted chains, the change in the well-depth of particle-particle PMFs, with increasing chain stiffness, is non-monotonous, while that for longer grafted chains (still shorter than matrix chains), the attractive well exhibits a monotonous decrease in its depth. The particle-matrix PMF and the matrix penetration depth into the brush layer indicate that wetting of the grafted layer by matrix chains is enhanced with increasing chain stiffness.
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Affiliation(s)
- Babji Palli
- Department of Chemical Engineering, Indian Institute of Technology Kharagpur, India.
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345
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Raos G, Idé J. Impact of Interaction Strength and Surface Heterogeneity on the Dynamics of Adsorbed Polymers. ACS Macro Lett 2014; 3:721-726. [PMID: 35590689 DOI: 10.1021/mz500233c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present molecular dynamics simulations of bead-and-spring polymer chains on chemically heterogeneous, energetically disordered surfaces at near-monolayer coverages. The surfaces consist of random mixtures of weakly (W) and strongly (S) attractive sites. We explore systematically the effect of surface composition on the diffusive dynamics of the chains. The polymer diffusion coefficients have a near-Arrhenius temperature dependence, with activation energies which have a nonmonotonic dependence on the fraction of S sites. In other words, we see a nonmonotonic dependence of the interfacial polymer dynamics on its affinity with the surface, when the latter involves some heterogeneity. The maximum activation energy belongs to the surface containing 75% S and 25% W sites, which combines near-maximum average polymer-surface interactions with near-maximum spread or disorder in these interactions. Our results have interesting implications for polymer adhesion and friction and structure-property relationships in polymer nanocomposites.
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Affiliation(s)
- Guido Raos
- Dipartimento di Chimica,
Materiali e Ingegneria Chimica “G. Natta”, Politecnico di Milano, via L. Mancinelli 7, 20131 Milano, Italy
| | - Julien Idé
- Dipartimento di Chimica,
Materiali e Ingegneria Chimica “G. Natta”, Politecnico di Milano, via L. Mancinelli 7, 20131 Milano, Italy
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346
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Bounor-Legaré V, Cassagnau P. In situ synthesis of organic–inorganic hybrids or nanocomposites from sol–gel chemistry in molten polymers. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2014.04.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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347
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Taguet A, Cassagnau P, Lopez-Cuesta JM. Structuration, selective dispersion and compatibilizing effect of (nano)fillers in polymer blends. Prog Polym Sci 2014. [DOI: 10.1016/j.progpolymsci.2014.04.002] [Citation(s) in RCA: 366] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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348
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Bouty A, Petitjean L, Degrandcourt C, Gummel J, Kwaśniewski P, Meneau F, Boué F, Couty M, Jestin J. Nanofiller Structure and Reinforcement in Model Silica/Rubber Composites: A Quantitative Correlation Driven by Interfacial Agents. Macromolecules 2014. [DOI: 10.1021/ma500582p] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Adrien Bouty
- Laboratoire
Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
- Manufacture Française
des Pneumatiques MICHELIN, Site de Ladoux, 23 place des Carmes Déchaux, F-63 040 Clermont-Ferrand, Cedex 9, France
| | - Laurent Petitjean
- Manufacture Française
des Pneumatiques MICHELIN, Site de Ladoux, 23 place des Carmes Déchaux, F-63 040 Clermont-Ferrand, Cedex 9, France
| | - Christophe Degrandcourt
- Manufacture Française
des Pneumatiques MICHELIN, Site de Ladoux, 23 place des Carmes Déchaux, F-63 040 Clermont-Ferrand, Cedex 9, France
| | - Jeremie Gummel
- European Synchrotron
Radiation Facility, 6 rue Jules Horowitz 38043 Grenoble, France
| | - Paweł Kwaśniewski
- European Synchrotron
Radiation Facility, 6 rue Jules Horowitz 38043 Grenoble, France
| | - Florian Meneau
- Synchrotron SOLEIL, L’Orme
des Merisiers, PO
Box 48, Saint-Aubin, 91192 Gif/Yvette, France
| | - François Boué
- Laboratoire
Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - Marc Couty
- Manufacture Française
des Pneumatiques MICHELIN, Site de Ladoux, 23 place des Carmes Déchaux, F-63 040 Clermont-Ferrand, Cedex 9, France
| | - Jacques Jestin
- Laboratoire
Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
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349
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Shen J, Liu J, Gao Y, Li X, Zhang L. Elucidating and tuning the strain-induced non-linear behavior of polymer nanocomposites: a detailed molecular dynamics simulation study. SOFT MATTER 2014; 10:5099-5113. [PMID: 24906702 DOI: 10.1039/c4sm00233d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
By setting up a coarse-grained model of polymer nanocomposites, we monitored the change in the elastic modulus as a function of the strain, derived from the stress-strain behavior by determining uniaxial tension and simple shear of two typical spatial distribution states (aggregation and dispersion) of nanoparticles (NPs). In both these cases, we observed that the elastic modulus decreases non-linearly with the increase of strain and reaches a low plateau at larger strains. This phenomenon is similar to the so-called "Payne effect" for elastomer nanocomposites. Particularly, the modulus of the aggregation case is more sensitive to the imposed strain. By examining the structural parameters, such as the number of neighboring NPs, coordination number of NPs, root-mean-squared average force exerted on the NPs, local strain, chain conformations (bridge, dangle, loop, interface bead and connection bead), and the total interaction energy of NP-polymer and NP-NP, we inferred that the underlying mechanism of the aggregation case is the disintegration of the NP network or clusters formed through direct contact; however, for the dispersion case, the non-linear behavior is attributed to the destruction of the NP network or clusters formed through the bridging of adsorbed polymer segments among the NPs. The former physical network is influenced by NP-NP interaction and NP volume fraction, while the latter is influenced by NP-polymer interaction and NP volume fraction. Lastly, we found that for the dispersion case, further increasing the inter-particle distance or grafting NPs with polymer chains can effectively reduce the non-linear behavior due to the decrease of the physical network density. In general, this simulation work, for the first time, establishes the correlation between the micro-structural evolution and the strain-induced non-linear behavior of polymer nanocomposites, and sheds some light on how to reduce the "Payne effect".
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Affiliation(s)
- Jianxiang Shen
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
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350
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Lin CC, Ohno K, Clarke N, Winey KI, Composto RJ. Macromolecular Diffusion through a Polymer Matrix with Polymer-Grafted Chained Nanoparticles. Macromolecules 2014. [DOI: 10.1021/ma501113c] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Chia-Chun Lin
- Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, United States
| | - Kohji Ohno
- Institute
for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Nigel Clarke
- Department
of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom
| | - Karen I. Winey
- Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, United States
| | - Russell J. Composto
- Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, United States
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