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A computer simulation of the effect of temperature on melt chain dimensions of random short chain branched polyethylene. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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2
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Ramos J, Vega J, Martínez-Salazar J. Predicting experimental results for polyethylene by computer simulation. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2017.12.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Chen QP, Chu JD, DeJaco RF, Lodge TP, Siepmann JI. Molecular Simulation of Olefin Oligomer Blend Phase Behavior. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00394] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qile P. Chen
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, United States
- Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - Justine D. Chu
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, United States
- Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - Robert F. DeJaco
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, United States
- Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - Timothy P. Lodge
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, United States
- Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
| | - J. Ilja Siepmann
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, United States
- Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, United States
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Wang XJ, Zhao XY, He JW, Chan TW, Cao XZ, Wu SZ. Thermodynamic Properties and Free Volume Analyses of Polycarbonates by a Combined Experimental and Molecular Simulation Method. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiu-Juan Wang
- Phase
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xiu-Ying Zhao
- Phase
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Jing-Wei He
- Phase
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Tung W. Chan
- Department
of Materials Science and Engineering, Virginia Polytechnic Institute and Phase University, Blacksburg, Virginia 24061, United States
| | - Xing-Zhong Cao
- Key
Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute
of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Si-Zhu Wu
- Phase
Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
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Yang QY, Lehn JM. Bright White-Light Emission from a Single Organic Compound in the Solid State. Angew Chem Int Ed Engl 2014; 53:4572-7. [DOI: 10.1002/anie.201400155] [Citation(s) in RCA: 167] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 02/04/2014] [Indexed: 01/05/2023]
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6
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Yang QY, Lehn JM. Bright White-Light Emission from a Single Organic Compound in the Solid State. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400155] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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7
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Sacristan J, Mijangos C. Free Volume Analysis and Transport Mechanisms of PVC Modified with Fluorothiophenol Compounds. A Molecular Simulation Study. Macromolecules 2010. [DOI: 10.1021/ma1011045] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Javier Sacristan
- Instituto de Ciencia y Tecnología de Polímeros (CSIC) C/Juan de la Cierva 3, 28008, Madrid, Spain
| | - Carmen Mijangos
- Instituto de Ciencia y Tecnología de Polímeros (CSIC) C/Juan de la Cierva 3, 28008, Madrid, Spain
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Sacristan J, Chen C, Maranas JK. Role of Effective Composition on Dynamics of PEO−PMMA Blends. Macromolecules 2008. [DOI: 10.1021/ma8003373] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Javier Sacristan
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
| | - Chunxia Chen
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
| | - Janna K. Maranas
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
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May AF, Maranas JK. The single chain limit of structural relaxation in a polyolefin blend. J Chem Phys 2006; 125:24906. [PMID: 16848610 DOI: 10.1063/1.2204034] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The influence of composition on component dynamics and relevant static properties in a miscible polymer blend is investigated using molecular dynamics simulation. Emphasis is placed on dynamics in the single chain dilution limit, as this limit isolates the role of inherent component mobility in the polymer's dynamic behavior when placed in a blend. For our systems, a biased local concentration affecting dynamics must arise primarily from chain connectivity, which is quantified by the self-concentration, because concentration fluctuations are minimized due to restraints on chain lengths arising from simulation considerations. The polyolefins simulated [poly(ethylene-propylene) (PEP) and poly(ethylene-butene) (PEB)] have similar structures and glass transition temperatures, and all interactions are dispersive in nature. We find that the dependence of dynamics upon composition differs between the two materials. Specifically, PEB (slower component) is more influenced by the environment than PEP. This is linked to a smaller self-concentration for PEB than PEP. We examine the accuracy of the Lodge-McLeish model (which is based on chain connectivity acting over the Kuhn segment length) in predicting simulation results for effective concentration. The model predicts the simulation results with high accuracy when the model's single parameter, the self-concentration, is calculated from simulation data. However, when utilizing the theoretical prediction of the self-concentration the model is not quantitatively accurate. The ability of the model to link the simulated self-concentration with biased local compositions at the Kuhn segment length provides strong support for the claim that chain connectivity is the leading cause of distinct mobility in polymer blends. Additionally, the direct link between the willingness of a polymer to be influenced by the environment and the value of the self-concentration emphasizes the importance of the chain connectivity. Furthermore, these findings are evidence that the Kuhn segment length is the relevant length scale controlling segmental dynamics.
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Affiliation(s)
- Andrew F May
- Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802, USA
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Yatsenko G, Sambriski EJ, Guenza MG. Coarse-grained description of polymer blends as interacting soft-colloidal particles. J Chem Phys 2005; 122:54907. [PMID: 15740353 DOI: 10.1063/1.1835271] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a theoretical approach which maps polymer blends onto mixtures of soft-colloidal particles. The analytical mesoscale pair correlation functions reproduce well data from united atom molecular dynamics simulations of polyolefin mixtures without fitting parameters. The theory exactly recovers the analytical expressions for density and concentration fluctuation structure factors of soft-colloidal mixtures (liquid alloys).
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Affiliation(s)
- G Yatsenko
- Department of Chemistry, Institute of Theoretical Science, University of Oregon, Eugene, OR 97403, USA
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Neelakantan A, Maranas JK. Intra- and Intermolecular Packing in Polyolefin Blends. Macromolecules 2004. [DOI: 10.1021/ma0303770] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arun Neelakantan
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
| | - Janna K. Maranas
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
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12
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Brantley EL, Holmes TC, Jennings GK. Modification of ATRP Surface-Initiated Poly(hydroxyethyl methacrylate) Films with Hydrocarbon Side Chains. J Phys Chem B 2004. [DOI: 10.1021/jp0476038] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eric L. Brantley
- Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
| | - Tracy C. Holmes
- Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
| | - G. Kane Jennings
- Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235
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Neelakantan A, Maranas JK. Spatial regimes in the dynamics of polyolefins: Self-motion. J Chem Phys 2004; 120:465-74. [PMID: 15267308 DOI: 10.1063/1.1629077] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Molecular dynamics simulations are used to investigate the spatial dependence of dynamics in a series of polyolefins. The dynamic indicator used is the self-intermediate scattering function, which parallels the observable in an incoherent quasielastic neutron scattering experiment such as time of flight or backscattering. As with neutron time of flight experiments, two processes are evident. The fast process is a single exponential, and has relaxation times that scale as q(-2), where q is the momentum transfer. The slow process is the stretched exponential decay usually associated with the motion underlying the glass transition. The stretching exponent is a function of spatial scale, with the minimum values occurring near the spatial scale of interchain packing. Relaxation times for the slow process scale as q(-2/beta) for all materials investigated. The relative contribution of the two processes is a function of spatial scale, with the crossover from fast to slow dynamics at the location of closest possible interchain contacts, which is approximately three times the cage size. These observations apply equally well to the four materials considered. We consider the relative ordering of relaxation times of the series in light of their local chain architecture. This ordering varies depending on the observable calculated..
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Affiliation(s)
- Arun Neelakantan
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Clark J, Maranas JK. Densification effects on structural relaxation of polyolefins. J Chem Phys 2003. [DOI: 10.1063/1.1611476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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