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1
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Zhao X, Grassia L, Simon SL. Mobility of Pressure-Densified and Pressure-Expanded Polystyrene Glasses: Dilatometry and a Test of KAHR Model. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00983] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiao Zhao
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, United States
| | - Luigi Grassia
- Department of Engineering, University of Campania Luigi Vanvitelli, Aversa 81031, Italy
| | - Sindee L. Simon
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
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2
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Deconvolution of the segmental and chain modes in amorphous polymers: Do the short-chain modes affect the bulk relaxation? POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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3
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Ni Y, Medvedev GA, Curliss DB, Caruthers JM. Linear viscoelastic relaxation in the α and α+ regions of linear polymers, crosslinked polymers and small molecules. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Sakib N, Koh YP, Huang Y, Mongcopa KIS, Le AN, Benicewicz BC, Krishnamoorti R, Simon SL. Thermal and Rheological Analysis of Polystyrene-Grafted Silica Nanocomposites. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02127] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Nazam Sakib
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, United States
| | - Yung P. Koh
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, United States
| | - Yucheng Huang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29201, United States
| | - Katrina Irene S. Mongcopa
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Amy N. Le
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Brian C. Benicewicz
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29201, United States
| | - Ramanan Krishnamoorti
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Sindee L. Simon
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, United States
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Zhao X, Simon SL. A model-free analysis of configurational properties to reduce the temperature- and pressure-dependent segmental relaxation times of polymers. J Chem Phys 2020; 152:044901. [PMID: 32007047 DOI: 10.1063/1.5131623] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The segmental relaxation time data for poly(vinyl acetate), poly(vinyl chloride), and linear and star polystyrene are analyzed using a model-free method to determine how the temperature- and pressure-dependent relaxation times, τ, scale with the relative configurational thermodynamic properties. The model-free method assumes no specific mathematical form, such as reciprocal linearity, and the configurational properties are referred to an isochronal state to eliminate the bias associated with the definition of the ideal glassy state. The scaling ability of a given configurational property is strongly material-dependent with the logarithm of τ scaling better with TSc and Hc for poly(vinyl acetate), with TSc, Hc, and Uc for poly(vinyl chloride), and with TSc, Hc, and Vc for linear and star polystyrene. The choice of the isochronal reference state does not qualitatively affect the results.
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Affiliation(s)
- Xiao Zhao
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, USA
| | - Sindee L Simon
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, USA
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Huang K, Isayev AI. Ultrasonic decrosslinking of peroxide crosslinked HDPE in twin screw extrusion: Part II simulation and experiment. POLYM ENG SCI 2017. [DOI: 10.1002/pen.24470] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Keyuan Huang
- Department of Polymer Engineering; The University of Akron; Akron Ohio 44325-0301
| | - Avraam I. Isayev
- Department of Polymer Engineering; The University of Akron; Akron Ohio 44325-0301
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7
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McKenna GB, Simon SL. 50th Anniversary Perspective: Challenges in the Dynamics and Kinetics of Glass-Forming Polymers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01014] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Gregory B. McKenna
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, United States
| | - Sindee L. Simon
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, United States
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9
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Schubert C, Osterwinter C, Tonhauser C, Schömer M, Wilms D, Frey H, Friedrich C. Can Hyperbranched Polymers Entangle? Effect of Hydrogen Bonding on Entanglement Transition and Thermorheological Properties of Hyperbranched Polyglycerol Melts. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00674] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Christian Schubert
- Freiburg
Materials Research Center (FMF), and Institute of Macromolecular Chemistry, University of Freiburg, Freiburg, Germany
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Mainz, Germany
| | - Carina Osterwinter
- Freiburg
Materials Research Center (FMF), and Institute of Macromolecular Chemistry, University of Freiburg, Freiburg, Germany
| | - Christoph Tonhauser
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Mainz, Germany
| | - Martina Schömer
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Mainz, Germany
| | - Daniel Wilms
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Mainz, Germany
| | - Holger Frey
- Institute
of Organic Chemistry, Organic and Macromolecular Chemistry, University of Mainz, Mainz, Germany
| | - Christian Friedrich
- Freiburg
Materials Research Center (FMF), and Institute of Macromolecular Chemistry, University of Freiburg, Freiburg, Germany
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11
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Huang K, Isayev AI. Comparison between decrosslinking of crosslinked high and low density polyethylenes via ultrasonically aided extrusion. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.05.047] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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12
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Tao R, Simon SL. Bulk and shear rheology of silica/polystyrene nanocomposite: Reinforcement and dynamics. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/polb.23669] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ran Tao
- Department of Chemical Engineering; Texas Tech University; Lubbock Texas 79409-3121
| | - Sindee L. Simon
- Department of Chemical Engineering; Texas Tech University; Lubbock Texas 79409-3121
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13
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Ngai KL, Plazek DJ. Thermo-Rheological, Piezo-Rheological, and TVγ-Rheological Complexities of Viscoelastic Mechanisms in Polymers. Macromolecules 2014. [DOI: 10.1021/ma501843u] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. L. Ngai
- Dipartimento
di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127, Pisa, Italy
- CNR-IPCF, Largo B. Pontecorvo 3, I-56127, Pisa, Italy
| | - D. J. Plazek
- Department of Mechanical
Engineering and Material Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261United States
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14
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Karim TB, McKenna GB. Comparison of surface mechanical properties among linear and star polystyrenes: Surface softening and stiffening at different temperatures. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.07.067] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Gao S, Koh YP, Simon SL. Calorimetric Glass Transition of Single Polystyrene Ultrathin Films. Macromolecules 2013. [DOI: 10.1021/ma3020036] [Citation(s) in RCA: 121] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Siyang Gao
- Department
of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, United States
| | - Yung P. Koh
- Department
of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, United States
| | - Sindee L. Simon
- Department
of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, United States
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16
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Ngai KL, Prevosto D, Grassia L. Viscoelasticity of nanobubble-inflated ultrathin polymer films: Justification by the coupling model. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/polb.23201] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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