1
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Jin X, Chen W. A Numerical simulation method for analyzing 1H spin diffusion NMR for Multicomponent and multiphase polymer systems. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2024; 132:101946. [PMID: 38943921 DOI: 10.1016/j.ssnmr.2024.101946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Revised: 05/30/2024] [Accepted: 06/24/2024] [Indexed: 07/01/2024]
Abstract
A numerical simulation method, namely, SDNMR-WEBFIT, is reported for simulating proton spin diffusion NMR based on the Levenberg-Marquardt algorithm and a pseudo-2D diffusion model. This method is used for the precise quantification of dynamics heterogeneity of the interphase within multiphase polymer systems. The numerical simulation method provides measurements of spin-lattice relaxation time (T1), proton density (ρH), lamellar thickness (d), and spin diffusion coefficient (D) for each component. The pseudo-2D diffusion model is employed to simulate the proton spin diffusion build-up/decay curves, simultaneously calculating the lateral fraction of island-like structures (x-ratio). Such approach was successfully applied to various polymer systems, such as semi-crystalline polymer (Poly(ε-caprolactone), PCL), block copolymers (Styrene-butadiene-styrene triblock copolymer, SBS), and plasticized semi-polymers (Polvinyl alcohol, PVA).
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Affiliation(s)
- Xuran Jin
- National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Wei Chen
- National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, 230026, China; Department of Accelerator Science and Engineering Physics, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230026, China.
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2
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Cheng S, Kogut D, Zheng J, Patil S, Yang F, Lu W. Dynamics of polylactic acid under ultrafine nanoconfinement: The collective interface effect and the spatial gradient. J Chem Phys 2024; 160:114904. [PMID: 38506298 DOI: 10.1063/5.0189762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 02/16/2024] [Indexed: 03/21/2024] Open
Abstract
Polymers under nanoconfinement can exhibit large alterations in dynamics from their bulk values due to an interface effect. However, understanding the interface effect remains a challenge, especially in the ultrafine nanoconfinement region. In this work, we prepare new geometries with ultrafine nanoconfinement ∼10nm through controlled distributions of the crystalline phases and the amorphous phases of a model semi-crystalline polymer, i.e., the polylactic acid. The broadband dielectric spectroscopy measurements show that ultrafine nanoconfinement leads to a large elevation in the glass transition temperature and a strong increment in the polymer fragility index. Moreover, new relaxation time profile analyses demonstrate a spatial gradient that can be well described by either a single-exponential decay or a double-exponential decay functional form near the middle of the film with a collective interface effect. However, the dynamics at the 1-2 nm vicinity of the interface exhibit a power-law decay that is different from the single-exponential decay or double-exponential decay functional forms as predicted by theories. Thus, these results call for further investigations of the interface effect on polymer dynamics, especially for interfaces with perturbed chain packing.
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Affiliation(s)
- Shiwang Cheng
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA
| | - David Kogut
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA
| | - Juncheng Zheng
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA
| | - Shalin Patil
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA
| | - Fuming Yang
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, Michigan 48824, USA
| | - Weiyi Lu
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, Michigan 48824, USA
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3
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Ghanekarade A, Simmons DS. Combined Mixing and Dynamical Origins of Tg Alterations Near Polymer–Polymer Interfaces. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Asieh Ghanekarade
- Department of Chemical, Biological, and Materials Engineering, University of South Florida, Tampa, Florida33544, United States
| | - David S. Simmons
- Department of Chemical, Biological, and Materials Engineering, University of South Florida, Tampa, Florida33544, United States
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4
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Jin T, Hilburg SL, Alexander-Katz A. Glass transition of random heteropolymers: A molecular dynamics simulation study in melt, in water, and in vacuum. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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5
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Drayer WF, Simmons DS. Sequence Effects on the Glass Transition of a Model Copolymer System. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- William F. Drayer
- Department of Chemical, Biological, and Materials Engineering, University of South Florida, Tampa, Florida 33620, United States
| | - David S. Simmons
- Department of Chemical, Biological, and Materials Engineering, University of South Florida, Tampa, Florida 33620, United States
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6
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Chen B, Torkelson JM. Development of rigid amorphous fraction in cold‐crystallized syndiotactic polystyrene films confined near the nanoscale: Novel analysis via ellipsometry. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20220056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Boran Chen
- Department of Chemical and Biological Engineering Northwestern University Evanston Illinois USA
| | - John M. Torkelson
- Department of Chemical and Biological Engineering Northwestern University Evanston Illinois USA
- Department of Materials Science and Engineering Northwestern University Evanston Illinois USA
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7
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Rissanou A, Chazirakis A, Polinska P, Burkhart C, Doxastakis M, Harmandaris V. Polybutadiene Copolymers via Atomistic and Systematic Coarse-Grained Simulations. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c01939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anastassia Rissanou
- Institute of Applied and Computational Mathematics (IACM), Foundation for Research and Technology Hellas, (FORTH), IACM/FORTH, GR-71110 Heraklion, Greece
- Department of Mathematics and Applied Mathematics, University of Crete, GR-71409 Heraklion, Crete, Greece
| | - Antonis Chazirakis
- Institute of Applied and Computational Mathematics (IACM), Foundation for Research and Technology Hellas, (FORTH), IACM/FORTH, GR-71110 Heraklion, Greece
- Department of Mathematics and Applied Mathematics, University of Crete, GR-71409 Heraklion, Crete, Greece
| | | | - Craig Burkhart
- The Goodyear Tire and Rubber Company, 142 Goodyear Blvd., 44305 Akron, Ohio, United States
| | - Manolis Doxastakis
- Department of Chemical and Biomolecular Engineering, University of Tennessee, 37996 Knoxville, Tennessee, United States
| | - Vagelis Harmandaris
- Institute of Applied and Computational Mathematics (IACM), Foundation for Research and Technology Hellas, (FORTH), IACM/FORTH, GR-71110 Heraklion, Greece
- Department of Mathematics and Applied Mathematics, University of Crete, GR-71409 Heraklion, Crete, Greece
- Computation-Based Science and Technology Research Center, The Cyprus Institute, 2121 Nicosia, Cyprus
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8
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Lang C, Kumar M, Hickey RJ. Current status and future directions of self-assembled block copolymer membranes for molecular separations. SOFT MATTER 2021; 17:10405-10415. [PMID: 34768280 DOI: 10.1039/d1sm01368h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
One of the most efficient and promising separation alternatives to thermal methods such as distillation is the use of polymeric membranes that separate mixtures based on molecular size or chemical affinity. Self-assembled block copolymer membranes have gained considerable attention within the membrane field due to precise control over nanoscale structure, pore size, and chemical versatility. Despite the rapid progress and excitement, a significant hurdle in using block copolymer membranes for nanometer and sub-nanometer separations such as nanofiltration and reverse osmosis is the lower limit on domain size features. Strategies such as polymer post-functionalization, self-assembly of oligomers, liquid crystals, and random copolymers, or incorporation of artificial/natural channels within block copolymer materials are future directions with the potential to overcome current limitations with respect to separation size.
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Affiliation(s)
- Chao Lang
- South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, Guangzhou 510640, China
- Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou 510640, China
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16801, USA.
| | - Manish Kumar
- Department of Civil, Architectural, and Environmental Engineering, The University of Texas at Austin, Austin, TX, 78712, USA.
| | - Robert J Hickey
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16801, USA.
- Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, 16801, USA
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9
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Righetti MC, Di Lorenzo ML, Cinelli P, Gazzano M. Temperature dependence of the rigid amorphous fraction of poly(butylene succinate). RSC Adv 2021; 11:25731-25737. [PMID: 35478875 PMCID: PMC9036998 DOI: 10.1039/d1ra03775g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 06/16/2021] [Indexed: 11/21/2022] Open
Abstract
In this contribution the temperature evolution of the constrained or rigid amorphous fraction (RAF) of biodegradable and biocompatible poly(butylene succinate) (PBS) was quantified, after detailed thermodynamic characterization by differential scanning calorimetry and X-ray diffraction analysis. At the glass transition temperature, around -40 °C, the rigid amorphous fraction in PBS is about 0.25. It decreases with increasing temperature and becomes zero in proximity of 25 °C. Thus, at room temperature and at the human body temperature, all the amorphous fraction is mobile. This information is important for the development of PBS products for various applications, including biomedical applications, since physical properties of the rigid amorphous fraction, for example mechanical and permeability properties, are different from those of the mobile amorphous fraction.
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Affiliation(s)
- Maria Cristina Righetti
- CNR-IPCF, National Research Council - Institute for Chemical and Physical Processes Via Moruzzi 1 56124 Pisa Italy
| | - Maria Laura Di Lorenzo
- CNR-IPCB, National Research Council - Institute of Polymers, Composites and Biomaterials Via Campi Flegrei 24 80078 Pozzuoli Italy
| | - Patrizia Cinelli
- University of Pisa, Department of Civil and Industrial Engineering Largo Lazzarino 2 56122 Pisa Italy
| | - Massimo Gazzano
- CNR-ISOF, National Research Council - Institute of Organic Synthesis and Photoreactivity Via Gobetti 101 40129 Bologna Italy
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10
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Rahman T, Simmons DS. Near-Substrate Gradients in Chain Relaxation and Viscosity in a Model Low-Molecular Weight Polymer. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02888] [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]
Affiliation(s)
- Tamanna Rahman
- Department of Polymer Engineering, The University of Akron, Akron, Ohio 44325, United States
| | - David S. Simmons
- Department of Chemical, Biological, and Materials Engineering, University of South Florida, Tampa, Florida 33620, United States
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11
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Alessandri R, Grünewald F, Marrink SJ. The Martini Model in Materials Science. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2008635. [PMID: 33956373 DOI: 10.1002/adma.202008635] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 03/15/2021] [Indexed: 06/12/2023]
Abstract
The Martini model, a coarse-grained force field initially developed with biomolecular simulations in mind, has found an increasing number of applications in the field of soft materials science. The model's underlying building block principle does not pose restrictions on its application beyond biomolecular systems. Here, the main applications to date of the Martini model in materials science are highlighted, and a perspective for the future developments in this field is given, particularly in light of recent developments such as the new version of the model, Martini 3.
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Affiliation(s)
- Riccardo Alessandri
- Zernike Institute for Advanced Materials and Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, Groningen, 9747AG, The Netherlands
| | - Fabian Grünewald
- Zernike Institute for Advanced Materials and Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, Groningen, 9747AG, The Netherlands
| | - Siewert J Marrink
- Zernike Institute for Advanced Materials and Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, Groningen, 9747AG, The Netherlands
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12
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Monnier X, Cavallo D, Righetti MC, Di Lorenzo ML, Marina S, Martin J, Cangialosi D. Physical Aging and Glass Transition of the Rigid Amorphous Fraction in Poly( l-lactic acid). Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01182] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Xavier Monnier
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
| | - Dario Cavallo
- Department of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, 16146 Genoa, Italy
| | - Maria Cristina Righetti
- CNR-IPCF, National Research Council - Institute for Chemical and Physical Processes, Via Moruzzi 1, 56124 Pisa, Italy
| | - Maria Laura Di Lorenzo
- CNR-IPCB, National Research Council - Institute of Polymers, Composites and Biomaterials, Via Campi Flegrei, 34, 80078 Pozzuoli, NA Italy
| | - Sara Marina
- POLYMAT, University of the Basque Country UPV/EHU, Av. de Tolosa 72, 20018 San Sebastián, Spain
| | - Jaime Martin
- POLYMAT, University of the Basque Country UPV/EHU, Av. de Tolosa 72, 20018 San Sebastián, Spain
- Ikerbasque - Basque Foundation for Science, 48013 Bilbao, Spain
| | - Daniele Cangialosi
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 San Sebastián, Spain
- Centro de Física de Materiales CFM (CSIC-UPV/EHU) and Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
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13
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Schweizer KS, Simmons DS. Progress towards a phenomenological picture and theoretical understanding of glassy dynamics and vitrification near interfaces and under nanoconfinement. J Chem Phys 2019; 151:240901. [PMID: 31893888 DOI: 10.1063/1.5129405] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The nature of alterations to dynamics and vitrification in the nanoscale vicinity of interfaces-commonly referred to as "nanoconfinement" effects on the glass transition-has been an open question for a quarter century. We first analyze experimental and simulation results over the last decade to construct an overall phenomenological picture. Key features include the following: after a metrology- and chemistry-dependent onset, near-interface relaxation times obey a fractional power law decoupling relation with bulk relaxation; relaxation times vary in a double-exponential manner with distance from the interface, with an intrinsic dynamical length scale appearing to saturate at low temperatures; the activation barrier and vitrification temperature Tg approach bulk behavior in a spatially exponential manner; and all these behaviors depend quantitatively on the nature of the interface. We demonstrate that the thickness dependence of film-averaged Tg for individual systems provides a poor basis for discrimination between different theories, and thus we assess their merits based on the above dynamical gradient properties. Entropy-based theories appear to exhibit significant inconsistencies with the phenomenology. Diverse free-volume-motivated theories vary in their agreement with observations, with approaches invoking cooperative motion exhibiting the most promise. The elastically cooperative nonlinear Langevin equation theory appears to capture the largest portion of the phenomenology, although important aspects remain to be addressed. A full theoretical understanding requires improved confrontation with simulations and experiments that probe spatially heterogeneous dynamics within the accessible 1-ps to 1-year time window, minimal use of adjustable parameters, and recognition of the rich quantitative dependence on chemistry and interface.
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Affiliation(s)
- Kenneth S Schweizer
- Departments of Materials Science, Chemistry and Chemical & Biomolecular Engineering, Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA
| | - David S Simmons
- Department of Chemical and Biomedical Engineering, University of South Florida, Tampa, Florida 33620, USA
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14
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Alam MM, Jack KS, Hill DJ, Whittaker AK, Peng H. Gradient copolymers – Preparation, properties and practice. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.04.028] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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15
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Zhang J, Farias-Mancilla B, Destarac M, Schubert US, Keddie DJ, Guerrero-Sanchez C, Harrisson S. Asymmetric Copolymers: Synthesis, Properties, and Applications of Gradient and Other Partially Segregated Copolymers. Macromol Rapid Commun 2018; 39:e1800357. [DOI: 10.1002/marc.201800357] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 07/30/2018] [Indexed: 12/25/2022]
Affiliation(s)
- Junliang Zhang
- MOE Key Laboratory; of Material Physics and Chemistry under Extraordinary Conditions; Shaanxi Key Laboratory of Macromolecular Science and Technology; Department of Applied Chemistry; School of Science; Northwestern Polytechnical University; Xi’an Shaanxi 710072 P. R. China
- Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Barbara Farias-Mancilla
- Université de Toulouse; CNRS UMR 5623; Université Toulouse III - Paul Sabatier; 118 route de Narbonne 31062 Toulouse Cedex 9 France
| | - Mathias Destarac
- Université de Toulouse; CNRS UMR 5623; Université Toulouse III - Paul Sabatier; 118 route de Narbonne 31062 Toulouse Cedex 9 France
| | - Ulrich S. Schubert
- Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Daniel J. Keddie
- Faculty of Science and Engineering; University of Wolverhampton; Wulfruna Street Wolverhampton WV1 1LY UK
| | - Carlos Guerrero-Sanchez
- Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Simon Harrisson
- Université de Toulouse; CNRS UMR 5623; Université Toulouse III - Paul Sabatier; 118 route de Narbonne 31062 Toulouse Cedex 9 France
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16
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Di Lorenzo ML, Righetti MC. Crystallization-induced formation of rigid amorphous fraction. POLYMER CRYSTALLIZATION 2018. [DOI: 10.1002/pcr2.10023] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Maria Laura Di Lorenzo
- CNR-IPCB, National Research Council; Institute for Polymers, Composites and Biomaterials, c/o Comprensorio Olivetti; Pozzuoli Italy
| | - Maria Cristina Righetti
- CNR-IPCF, National Research Council; Institute for Chemical and Physical Processes; Pisa Italy
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17
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Li L, Marrou SR, Torkelson JM. Remarkable glass transition breadths up to 120 K exhibited by block-gradient copolymers and by gradient copolymers plasticized by oligomer. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.07.058] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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Hugouvieux V, Kob W. Structuring polymer gels via catalytic reactions. SOFT MATTER 2017; 13:8706-8716. [PMID: 29130096 DOI: 10.1039/c7sm01814b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We use computer simulations to investigate how a catalytic reaction in a polymer sol can induce the formation of a polymer gel. To this aim we consider a solution of homopolymers in which freely-diffusing catalysts convert the originally repulsive A monomers into attractive B ones. We find that at low temperatures this reaction transforms the polymer solution into a physical gel that has a remarkably regular mesostructure in the form of a cluster phase, absent in the usual homopolymer gels obtained by a quench in temperature. We investigate how this microstructuring depends on catalyst concentration, temperature, and polymer density and show that the dynamics for its formation can be understood in a semi-quantitative manner using the interaction potentials between the particles as input. The structuring of the copolymers and the AB sequences resulting from the reactions can be discussed in the context of the phase behaviour of correlated random copolymers. The location of the spinodal line as found in our simulations is consistent with analytical predictions. Finally, we show that the observed structuring depends not only on the chemical distribution of the A and B monomers but also on the mode of formation of this distribution.
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Affiliation(s)
- Virginie Hugouvieux
- SPO, INRA, Montpellier SupAgro, University of Montpellier, 34060 Montpellier, France.
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19
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Vogt BD. Mechanical and viscoelastic properties of confined amorphous polymers. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/polb.24529] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Bryan D. Vogt
- Department of Polymer Engineering; University of Akron; Akron Ohio 44325
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20
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Peng W, Ranganathan R, Keblinski P, Ozisik R. Viscoelastic and Dynamic Properties of Well-Mixed and Phase-Separated Binary Polymer Blends: A Molecular Dynamics Simulation Study. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00657] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei Peng
- Materials Science
and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Raghavan Ranganathan
- Materials Science
and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Pawel Keblinski
- Materials Science
and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Rahmi Ozisik
- Materials Science
and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
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21
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Mao S, MacPherson Q, Qin J, Spakowitz AJ. Field-theoretic simulations of random copolymers with structural rigidity. SOFT MATTER 2017; 13:2760-2772. [PMID: 28338151 DOI: 10.1039/c7sm00164a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Copolymers play an important role in a range of soft-materials applications and biological phenomena. Prevalent works on block copolymer phase behavior use flexible chain models and incorporate interactions using a mean-field approximation. However, when phase separation takes place on length scales comparable to a few monomers, the structural rigidity of the monomers becomes important. In addition, concentration fluctuations become significant at short length scales, rendering the mean-field approximation invalid. In this work, we use simulation to address the role of finite monomer rigidity and concentration fluctuations in microphase segregation of random copolymers. Using a field-theoretic Monte-Carlo simulation of semiflexible polymers with random chemical sequences, we generate phase diagrams for random copolymers. We find that the melt morphology of random copolymers strongly depends on chain flexibility and chemical sequence correlation. Chemically anti-correlated copolymers undergo first-order phase transitions to local lamellar structures. With increasing degree of chemical correlation, this first-order phase transition is softened, and melts form microphases with irregular shaped domains. Our simulations in the homogeneous phase exhibit agreement with the density-density correlation from mean-field theory. However, conditions near a phase transition result in deviations between simulation and mean-field theory for the density-density correlation and the critical wavemode. Chain rigidity and sequence randomness lead to frustration in the segregated phase, introducing heterogeneity in the resulting morphologies.
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Affiliation(s)
- Shifan Mao
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
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22
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Jasinski F, Teo VL, Kuchel RP, Mballa Mballa M, Thickett SC, Brinkhuis RHG, Weaver W, Zetterlund PB. Synthesis and characterisation of gradient polymeric nanoparticles. Polym Chem 2017. [DOI: 10.1039/c6py02062c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
In this communication, we report the successful synthesis of gradient morphology nanoparticles composed of poly(styrene-co-methyl methacrylate) and their characterisation using X-Ray Photoelectron Spectroscopy (XPS).
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Affiliation(s)
- Florent Jasinski
- Centre for Advanced Macromolecular Design (CAMD)
- School of Chemical Engineering
- University of New South Wales
- Sydney
- Australia
| | - Victoria L. Teo
- Centre for Advanced Macromolecular Design (CAMD)
- School of Chemical Engineering
- University of New South Wales
- Sydney
- Australia
| | - Rhiannon P. Kuchel
- Electron Microscopy Unit (EMU)
- University of New South Wales
- Sydney
- Australia
| | | | | | | | - William Weaver
- School of Physical Sciences
- University of Tasmania
- Sandy Bay
- Australia
| | - Per B. Zetterlund
- Centre for Advanced Macromolecular Design (CAMD)
- School of Chemical Engineering
- University of New South Wales
- Sydney
- Australia
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23
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Mao S, MacPherson QJ, He SS, Coletta E, Spakowitz AJ. Impact of Conformational and Chemical Correlations on Microphase Segregation in Random Copolymers. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02639] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
| | | | | | | | - Andrew J. Spakowitz
- Stanford
Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo
Park, California 94025, United States
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24
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Sethuraman V, Pryamitsyn V, Ganesan V. Normal Modes and Dielectric Spectra of Diblock Copolymers in Lamellar Phases. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02721] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vaidyanathan Sethuraman
- Department
of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Victor Pryamitsyn
- Department
of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Venkat Ganesan
- Department
of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States
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25
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Sethuraman V, Pryamitsyn V, Ganesan V. Influence of molecular weight and degree of segregation on local segmental dynamics of ordered block copolymers. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.23985] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | - Victor Pryamitsyn
- Department of Chemical Engineering; University of Texas at Austin; Austin Texas 78712
| | - Venkat Ganesan
- Department of Chemical Engineering; University of Texas at Austin; Austin Texas 78712
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26
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Affiliation(s)
- David S. Simmons
- Department of Polymer Engineering; University of Akron; 250 South Forge St Akron OH 44325 USA
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27
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Abstract
Synthesis of gradient liquid crystalline copolymers is reported for the first time, phase structures of which on multiple length scales with composition and temperature are investigated and compared with the corresponding diblock copolymers.
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Affiliation(s)
- Yu Liu
- Department of Polymer Science
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
| | - Wei Wei
- Department of Polymer Science
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
| | - Huiming Xiong
- Department of Polymer Science
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
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28
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Lang RJ, Merling WL, Simmons DS. Combined Dependence of Nanoconfined Tg on Interfacial Energy and Softness of Confinement. ACS Macro Lett 2014; 3:758-762. [PMID: 35590695 DOI: 10.1021/mz500361v] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We employ molecular dynamics simulations of nanolayered polymers to systematically quantify the dependence of Tg nanoconfinement effects on interfacial energy and the "softness" of confinement. Results indicate that nanoconfined Tg depends linearly on interfacial adhesion energy, with a slope that scales exponentially with the ratio of the bulk Debye-Waller factors ⟨u2⟩ of the confined and confining materials. These trends, together with a convergence at low interfacial adhesion energy to the Tg of an equivalent freestanding film, are captured in a single functional form, with only three parameters explicitly referring to the confined state. The observed dependence on ⟨u2⟩ indicates that softness of nanoconfinement should be defined in terms of the relative high frequency shear moduli, rather than low frequency moduli or relaxation times, of the confined and confining materials.
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Affiliation(s)
- Ryan J. Lang
- Department of Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, Ohio 44325-0301, United States
| | - Weston L. Merling
- Department of Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, Ohio 44325-0301, United States
| | - David S. Simmons
- Department of Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, Ohio 44325-0301, United States
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29
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Ilyin SO, Malkin AY, Kulichikhin VG, Denisova YI, Krentsel LB, Shandryuk GA, Litmanovich AD, Litmanovich EA, Bondarenko GN, Kudryavtsev YV. Effect of Chain Structure on the Rheological Properties of Vinyl Acetate–Vinyl Alcohol Copolymers in Solution and Bulk. Macromolecules 2014. [DOI: 10.1021/ma5003326] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Sergey O. Ilyin
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, 119991 Moscow, Russia
| | - Alexander Ya. Malkin
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, 119991 Moscow, Russia
| | - Valery G. Kulichikhin
- Chemistry Department, Moscow State University, Leninskie gory 1, build. 3, 119991 Moscow, Russia
| | - Yulia I. Denisova
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, 119991 Moscow, Russia
| | - Liya B. Krentsel
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, 119991 Moscow, Russia
| | - Georgiy A. Shandryuk
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, 119991 Moscow, Russia
| | - Arkadiy D. Litmanovich
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, 119991 Moscow, Russia
| | - Ekaterina A. Litmanovich
- Chemistry Department, Moscow State University, Leninskie gory 1, build. 3, 119991 Moscow, Russia
| | - Galina N. Bondarenko
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, 119991 Moscow, Russia
| | - Yaroslav V. Kudryavtsev
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prosp. 29, 119991 Moscow, Russia
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30
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Guo Y, Zhang J, Xie P, Gao X, Luo Y. Tailor-made compositional gradient copolymer by a many-shot RAFT emulsion polymerization method. Polym Chem 2014. [DOI: 10.1039/c4py00003j] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A many-shot RAFT emulsion polymerization method to synthesize gradient copolymers with high molecular weight and a tailor-made compositional gradient.
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Affiliation(s)
- Yunlong Guo
- The State Key Laboratory of Chemical Engineering
- Department of Chemical and Biological Engineering
- Zhejiang University
- Hangzhou, China
| | - Jianhua Zhang
- Department of Polymer Science and Engineering
- School of Chemical Engineering and Technology
- Tianjin University
- , China
| | - Peile Xie
- The State Key Laboratory of Chemical Engineering
- Department of Chemical and Biological Engineering
- Zhejiang University
- Hangzhou, China
| | - Xiang Gao
- The State Key Laboratory of Chemical Engineering
- Department of Chemical and Biological Engineering
- Zhejiang University
- Hangzhou, China
| | - Yingwu Luo
- The State Key Laboratory of Chemical Engineering
- Department of Chemical and Biological Engineering
- Zhejiang University
- Hangzhou, China
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