1
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Effects of strain rate and temperature on the mechanical behavior of polymethyl methacrylate (PMMA). Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04472-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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2
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Liu Y, Shi G, Wu G. Mediating the slow dynamics of polyacrylates by small molecule-bridged hydrogen bonds. SOFT MATTER 2022; 18:4445-4454. [PMID: 35648624 DOI: 10.1039/d2sm00453d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
This report studied the changes in the slow dynamics of polyacrylate by adding a hindered phenol (CA) capable of forming three intermolecular hydrogen bonds (inter-HBs) per molecule with the polymer chain. The CA molecule apparently diminishes the slow modes (with lower peak temperatures and peak heights) of the polyacrylate, although it has a higher glass transition temperature (Tg) than the acrylic matrix, and the rigid CA-bridged HB network significantly amplifies the α-relaxation near Tg (with higher peak temperatures and peak heights). Consequently, the mixtures exhibit a diminishing slow mode that gradually merges with the prominent α-peak with increasing CA loadings. The anomalous dynamics concerning the opposite behaviors of the slow mode and α-relaxation was further rationalized in terms of dissociation of inter-HBs when the temperature is higher than Tg, together with the small molecule-alleviated macromolecular connectivity. This work provides essential insights into the slow dynamics of such HB-driven hybrids, and paves the way for tailoring the viscous flow properties of the hybrid material from a molecular level perspective.
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Affiliation(s)
- Yuanbiao Liu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, China.
- School of Materials Science & Engineering, Shandong University of Technology, Zibo 255000, China
| | - Gaopeng Shi
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Guozhang Wu
- Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science & Engineering, East China University of Science & Technology, Shanghai 200237, China.
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3
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Mei B, Lin TW, Sheridan GS, Evans CM, Sing CE, Schweizer KS. Structural Relaxation and Vitrification in Dense Cross-Linked Polymer Networks: Simulation, Theory, and Experiment. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00277] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Baicheng Mei
- Department of Materials Science, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Tsai-Wei Lin
- Department of Chemical & Biomolecular Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Grant S. Sheridan
- Department of Materials Science, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Christopher M. Evans
- Department of Materials Science, University of Illinois, Urbana, Illinois 61801, United States
- Department of Chemical & Biomolecular Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Charles E. Sing
- Department of Materials Science, University of Illinois, Urbana, Illinois 61801, United States
- Department of Chemical & Biomolecular Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Kenneth S. Schweizer
- Department of Materials Science, University of Illinois, Urbana, Illinois 61801, United States
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
- Department of Chemical & Biomolecular Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
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4
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Lei X, Xiong G, Xiao Y, Huang T, Xin X, Xue S, Zhang Q. High temperature shape memory poly(amide-imide)s with strong mechanical robustness. Polym Chem 2022. [DOI: 10.1039/d2py00739h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Shape memory poly(amide-imide)s with strong mechanical robustness, outstanding heat resistance and low water uptake were fabricated.
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Affiliation(s)
- Xingfeng Lei
- School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions of Ministry of Education, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Guo Xiong
- School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions of Ministry of Education, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Yuyang Xiao
- School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions of Ministry of Education, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Tianhao Huang
- School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions of Ministry of Education, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Xiangze Xin
- School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions of Ministry of Education, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Shuyu Xue
- School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions of Ministry of Education, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Qiuyu Zhang
- School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions of Ministry of Education, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
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5
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Shundo A, Aoki M, Yamamoto S, Tanaka K. Effect of Cross-Linking Density on Horizontal and Vertical Shift Factors in Linear Viscoelastic Functions of Epoxy Resins. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01293] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Atsuomi Shundo
- Department of Automotive Science, Kyushu University, Fukuoka 819-0395, Japan
| | - Mika Aoki
- Center for Polymer Interface and Molecular Adhesion Science, Kyushu University, Fukuoka 819-0395, Japan
| | - Satoru Yamamoto
- Center for Polymer Interface and Molecular Adhesion Science, Kyushu University, Fukuoka 819-0395, Japan
| | - Keiji Tanaka
- Department of Automotive Science, Kyushu University, Fukuoka 819-0395, Japan
- Center for Polymer Interface and Molecular Adhesion Science, Kyushu University, Fukuoka 819-0395, Japan
- Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan
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6
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Katsourinis S, Kontou E. The effectiveness of interconversion methods based on the distributed nature of polymeric structure. POLYM ENG SCI 2021. [DOI: 10.1002/pen.25696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Stelios Katsourinis
- Department of Applied Mathematical and Physical Sciences, Section of Mechanics National Technical University of Athens Athens Greece
| | - Evagelia Kontou
- Department of Applied Mathematical and Physical Sciences, Section of Mechanics National Technical University of Athens Athens Greece
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Niem T, Gonschorek S, Wöstmann B. New method to differentiate surface damping behavior and stress absorption capacities of common CAD/CAM restorative materials. Dent Mater 2021; 37:e213-e230. [PMID: 33531148 DOI: 10.1016/j.dental.2020.12.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 12/17/2020] [Accepted: 12/30/2020] [Indexed: 01/20/2023]
Abstract
OBJECTIVES To assess energy dissipation capacities and surface damping abilities of different CAD/CAM restorative materials (CRMs) to characterize stress resistance during load peaks. METHODS Using instrumented indentation testing (IIT), Martens hardness (HM) together with its elastic (ηIT) and plastic index (ηITdis) and Leeb hardness (HLD) together with its deduced energy dissipation (HLDdis) were determined for eight ceramic, eight composite, and four polymer-based materials as well as three metals. The results were compared to those of bovine enamel. Ten indentations per material were performed at room temperature (23 ± 1 °C) on two separate specimens (12.0 × 12.0 × 3.5 mm3) after water storage (24 h; 37.0 ± 1.0 °C). Hardness parameters were recorded, and data were analyzed with one-way MANOVA (Games-Howell post hoc tests, α = 0.05). Correlations between different parameters were tested (Pearson, α = 0.05). RESULTS Independently determined HLDdis, and ηITdis values substantiated different energy dissipation characteristics of CRM, whereby a strong correlation was observed for the two datasets (r = 0.956, p = 0.011). Ceramics had the significantly lowest values (p < 0.001) while both parameters revealed the highest surface damping effects for metals (p < 0.001), followed in both cases by bovine enamel. Energy dissipation of polymer and composite CRM was in between ceramics and bovine enamel (p < 0.001), whereas only for HLDdis did both show no significant difference (p > 0.05). SIGNIFICANCE Promising new HLDdis and ηITdis data allow a reliable differentiation of energy dissipation and surface damping capacities of CRMs. Previously published rankings of edge chipping and loss tangent results were perfectly reproduced, especially by HLDdis.
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Affiliation(s)
- Th Niem
- Department of Prosthodontics, Justus-Liebig University, Schlangenzahl 14, 35392 Giessen, Germany.
| | - S Gonschorek
- Department of Prosthodontics, Justus-Liebig University, Schlangenzahl 14, 35392 Giessen, Germany.
| | - B Wöstmann
- Department of Prosthodontics, Justus-Liebig University, Schlangenzahl 14, 35392 Giessen, Germany.
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8
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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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9
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Study on the effect of side-chain group on the segmental dynamics of selected methacrylate polymers at ambient and high pressures. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121860] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Bennin T, Ricci J, Ediger MD. Enhanced Segmental Dynamics of Poly(lactic acid) Glasses during Constant Strain Rate Deformation. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01363] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Trevor Bennin
- Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Josh Ricci
- Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - M. D. Ediger
- Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
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11
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Shen J, Lin X, Liu J, Li X. Effects of Cross-Link Density and Distribution on Static and Dynamic Properties of Chemically Cross-Linked Polymers. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01389] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jianxiang Shen
- Department of Polymer Science and Engineering, Jiaxing University, Jiaxing 314001, P. R. China
| | - Xiangsong Lin
- Department of Polymer Science and Engineering, Jiaxing University, Jiaxing 314001, P. R. China
| | - Jun Liu
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xue Li
- Department of Chemical and Textile Engineering, Jiaxing University Nanhu College, Jiaxing 314001, P. R. China
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12
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Startsev OV, Lebedev MP. Glass-Transition Temperature and Characteristic Temperatures of α Transition in Amorphous Polymers Using the Example of Poly(methyl methacrylate). POLYMER SCIENCE SERIES A 2018. [DOI: 10.1134/s0965545x19010073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Khabiri M, Jafari SH, Pourhossainy MR, Khonakdar HA. Alteration of matrix curing characteristics and its role in extension of hydrodynamic equation for predicting viscoelastic properties of nitrile rubber/silica nanocomposites. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mohammad Khabiri
- School of Chemical Engineering, College of Engineering; University of Tehran; PO Box 11155-4563 Tehran Iran
| | - Seyed Hassan Jafari
- School of Chemical Engineering, College of Engineering; University of Tehran; PO Box 11155-4563 Tehran Iran
| | - Mohammad Reza Pourhossainy
- Faculty of Materials and Manufacturing Processes; Malek Ashtar University of Technology; PO Box 15875-1774 Tehran Iran
| | - Hossein Ali Khonakdar
- Department of Polymer Processing; Iran Polymer and Petrochemical Institute; Tehran 14965-115 Iran
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14
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Tao W, Shen J, Chen Y, Liu J, Gao Y, Wu Y, Zhang L, Tsige M. Strain rate and temperature dependence of the mechanical properties of polymers: A universal time-temperature superposition principle. J Chem Phys 2018; 149:044105. [DOI: 10.1063/1.5031114] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Wei Tao
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing, People’s Republic of China
| | - Jianxiang Shen
- Department of Polymer Science and Engineering, Jiaxing University, Jiaxing 314001, People’s Republic of China
| | - Yulong Chen
- College of Material Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Jun Liu
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
| | - Yangyang Gao
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing, People’s Republic of China
| | - Youping Wu
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
| | - Liqun Zhang
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
| | - Mesfin Tsige
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, USA
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15
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Sousa MP, Neto AI, Correia TR, Miguel SP, Matsusaki M, Correia IJ, Mano JF. Bioinspired multilayer membranes as potential adhesive patches for skin wound healing. Biomater Sci 2018; 6:1962-1975. [PMID: 29850674 PMCID: PMC6420149 DOI: 10.1039/c8bm00319j] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Bioinspired and adhesive multilayer membranes are produced using the layer-by-layer (LbL) assembly of chitosan (CHT), alginate (ALG) and hyaluronic acid modified with dopamine (HA-DN). Freestanding multilayer membranes without DN are also produced as a control. The success of the synthesis of HA-DN was confirmed using UV-visible spectroscopy. Scanning electron microscopy images indicate that the surface of the DN-containing membranes is more porous than the control ones; they also present a higher average thickness value for the same number of CHT/ALG/CHT/HA(-DN) tetralayers (n = 100). Also, water uptake, mechanical strength and adhesion are enhanced with the introduction of DN moieties along the nano-layers. Besides, human dermal fibroblast viability, enhanced adhesion and proliferation were confirmed by immunofluorescence assays and by measuring both the metabolic activity and DNA content. Moreover, in vivo assays with such kinds of DN-containing multilayer membranes were performed; the application of these membranes in the treatment of dermal wounds induced in Wistar rats results in the highest decrease of inflammation of rat skin, compared with the control conditions. Overall, this investigation suggests that these mussel-inspired freestanding multilayer membranes may enhance either their mechanical performance or cellular adhesion and proliferation, leading to an improved wound healing process, being a promising material to restore the structural and functional properties of wounded skin.
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Affiliation(s)
- Maria P Sousa
- CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
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16
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Gomes TD, Caridade SG, Sousa MP, Azevedo S, Kandur MY, Öner ET, Alves NM, Mano JF. Adhesive free-standing multilayer films containing sulfated levan for biomedical applications. Acta Biomater 2018; 69:183-195. [PMID: 29378324 DOI: 10.1016/j.actbio.2018.01.027] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 12/09/2017] [Accepted: 01/18/2018] [Indexed: 12/21/2022]
Abstract
This work is the first reporting the use of layer-by-layer to produce adhesive free-standing (FS) films fully produced using natural-based macromolecules: chitosan (CHI), alginate (ALG) and sulfated levan (L-S). The deposition conditions of the natural polymers were studied through zeta potential measurements and quartz crystal microbalance with dissipation monitoring analysis. The properties of the FS films were evaluated and compared with the control ones composed of only CHI and ALG in order to assess the influence of levan polysaccharide introduced in the multilayers. Tensile tests, dynamic mechanical analysis and single lap shear strength tests were performed to evaluate the mechanical properties of the prepared FS films. The presence of L-S conferred both higher tensile strength and shear strength to the developed FS membranes. The results showed an adhesion strength 4 times higher than the control (CHI/ALG) FS films demonstrating the adhesive character of the FS films containing L-S. Morphological and topography studies were carried out revealing that the crosslinking reaction granted the L-S based FS film with a higher roughness and surface homogeneity. Preliminary biological assays were performed by cultivating myoblasts cells on the surface of the produced FS films. Both crosslinked and uncrosslinked FS films containing L-S were cytocompatible and myoconductive. STATEMENT OF SIGNIFICANCE Sutures remain as the "gold standard" for wound closure and bleeding control; however they still have limitations such as, high infection rate, inconvenience in handling, and concern over possible transmission of blood-borne disease through the use of needles. One of the challenges of tissue engineering consist on the design and development of biocompatible tissue adhesives and sealants with high adhesion properties to repair or attach devices to tissues. In this work, the introduction of sulfated levan (L-S) on multilayered free-standing membranes was proposed to confer adhesive properties. Moreover, the films were myoconductive even in the absence of crosslinking just by the presence of L-S. This study provides a promising strategy to develop biological adhesives and for cardiac tissue engineering applications.
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17
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Khabiri M, Jafari SH, Pourhossaini MR, Khonakdar HA. Investigations on matrix network characteristics in NBR/silica nanocomposites: Resolving matrix bulk density and network molecular weight and their alterations due to filler-curing agent interactions. J Appl Polym Sci 2017. [DOI: 10.1002/app.46170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Mohammad Khabiri
- School of Chemical Engineering, College of Engineering; University of Tehran; PO Box 11155-4563, Tehran Iran
| | - Seyed Hassan Jafari
- School of Chemical Engineering, College of Engineering; University of Tehran; PO Box 11155-4563, Tehran Iran
| | - Mohammad Reza Pourhossaini
- Faculty of Materials and Manufacturing Processes; Malek Ashtar University of Technology; PO Box 15875-1774, Tehran Iran
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18
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Palanivel A, Veerabathiran A, Duruvasalu R, Iyyanar S, Velumayil R. Dynamic mechanical analysis and crystalline analysis of hemp fiber reinforced cellulose filled epoxy composite. POLIMEROS 2017. [DOI: 10.1590/0104-1428.00516] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Sousa MP, Caridade SG, Mano JF. Control of Cell Alignment and Morphology by Redesigning ECM-Mimetic Nanotopography on Multilayer Membranes. Adv Healthc Mater 2017; 6:10.1002/adhm.201601462. [PMID: 28371516 PMCID: PMC6398568 DOI: 10.1002/adhm.201601462] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Revised: 02/11/2017] [Indexed: 01/08/2023]
Abstract
Inspired by native extracellular matrix (ECM) together with the multilevel architecture observed in nature, a material which topography recapitulates topographic features of the ECM and the internal architecture mimics the biological materials organization is engineered. The nanopatterned design along the XY plane is combined with a nanostructured organization along the Z axis on freestanding membranes prepared by layer-by-layer deposition of chitosan and chondroitin sulfate. Cellular behavior is monitored using two different mammalian cell lines, fibroblasts (L929) and myoblasts (C2C12), in order to perceive the response to topography. Viability, proliferation, and morphology of L929 are sensitively controlled by topography; also differentiation of C2C12 into myotubes is influenced by the presence of nanogrooves. This kind of nanopatterned structure has also been associated with strong cellular alignment. To the best of the knowledge, it is the first time that such a straightforward and inexpensive strategy is proposed to produce nanopatterned freestanding multilayer membranes. Controlling cellular alignment plays a critical role in many human tissues, such as muscles, nerves, or blood vessels, so these membranes can be potentially useful in specific tissue regeneration strategies.
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20
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Spathis G, Katsourinis S, Kontou E. Evaluation of fundamental viscoelastic functions by a nonlinear viscoelastic model. POLYM ENG SCI 2017. [DOI: 10.1002/pen.24525] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gerasimos Spathis
- Department of Applied Mathematical and Physical Sciences; Section of Mechanics, National Technical University of Athens; Athens GR-15773 Greece
| | - Stylianos Katsourinis
- Department of Applied Mathematical and Physical Sciences; Section of Mechanics, National Technical University of Athens; Athens GR-15773 Greece
| | - Evagelia Kontou
- Department of Applied Mathematical and Physical Sciences; Section of Mechanics, National Technical University of Athens; Athens GR-15773 Greece
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21
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Han B, Chery DR, Yin J, Lu XL, Lee D, Han L. Nanomechanics of layer-by-layer polyelectrolyte complexes: a manifestation of ionic cross-links and fixed charges. SOFT MATTER 2016; 12:1158-1169. [PMID: 26599600 DOI: 10.1039/c5sm01430a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This study investigates the roles of two distinct features of ionically cross-linked polyelectrolyte networks - ionic cross-links and fixed charges - in determining their nanomechanical properties. The layer-by-layer assembled poly(allylamine hydrochloride)/poly(acrylic acid) (PAH/PAA) network is used as the model material. The densities of ionic cross-links and fixed charges are modulated through solution pH and ionic strength (IS), and the swelling ratio, elastic and viscoelastic properties are quantified via an array of atomic force microscopy (AFM)-based nanomechanical tools. The roles of ionic cross-links are underscored by the distinctive elastic and viscoelastic nanomechanical characters observed here. First, as ionic cross-links are highly sensitive to solution conditions, the instantaneous modulus, E0, exhibits orders-of-magnitude changes upon pH- and IS-governed swelling, distinctive from the rubber elasticity prediction based on permanent covalent cross-links. Second, ionic cross-links can break and self-re-form, and this mechanism dominates force relaxation of PAH/PAA under a constant indentation depth. In most states, the degree of relaxation is >90%, independent of ionic cross-link density. The importance of fixed charges is highlighted by the unexpectedly more elastic nature of the network despite low ionic cross-link density at pH 2.0, IS 0.01 M. Here, the complex is a net charged, loosely cross-linked, where the degree of relaxation is attenuated to ≈50% due to increased elastic contribution arising from fixed charge-induced Donnan osmotic pressure. In addition, this study develops a new method for quantifying the thickness of highly swollen polymer hydrogel films. It also underscores important technical considerations when performing nanomechanical tests on highly rate-dependent polymer hydrogel networks. These results provide new insights into the nanomechanical characters of ionic polyelectrolyte complexes, and lay the ground for further investigation of their unique time-dependent properties.
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Affiliation(s)
- Biao Han
- School of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, PA 19104, USA.
| | - Daphney R Chery
- School of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, PA 19104, USA.
| | - Jie Yin
- Department of Mechanical Engineering, Temple University, Philadelphia, PA 19122, USA
| | - X Lucas Lu
- Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Lin Han
- School of Biomedical Engineering, Science, and Health Systems, Drexel University, Philadelphia, PA 19104, USA.
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22
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Yazdani-Ahmadabadi H, Rastegar S, Ranjbar Z. Modeling physico-mechanical properties of an individual photopolymerization-induced urethane-based microgel particle. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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23
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Influence of the vulcanization system on the dynamics and structure of natural rubber: Comparative study by means of broadband dielectric spectroscopy and solid-state NMR spectroscopy. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.04.021] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Caridade SG, Monge C, Almodóvar J, Guillot R, Lavaud J, Josserand V, Coll JL, Mano JF, Picart C. Myoconductive and osteoinductive free-standing polysaccharide membranes. Acta Biomater 2015; 15:139-49. [PMID: 25575853 DOI: 10.1016/j.actbio.2014.12.027] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 12/26/2014] [Accepted: 12/30/2014] [Indexed: 01/18/2023]
Abstract
Free-standing (FS) membranes have increasing applications in the biomedical field as drug delivery systems for wound healing and tissue engineering. Here, we studied the potential of free-standing membranes made by the layer-by-layer assembly of chitosan and alginate to be used as a simple biomimetic system of the periosteum. The design of a periosteum-like membrane implies the elaboration of a thick membrane suitable for both muscle and bone formation. Our aim was to produce well-defined ∼50 μm thick polysaccharide membranes that could be easily manipulated, were mechanically resistant, and would enable both myogenesis and osteogenesis in vitro and in vivo. The membranes were chemically crosslinked to improve their mechanical properties. Crosslinking chemistry was followed via Fourier transform infrared spectroscopy and the mechanical properties of the membranes were assessed using dynamic mechanical analysis. The loading and release of the potent osteoinductive growth factor bone morphogenetic protein 2 (BMP-2) inside and outside of the FS membrane was followed by fluorescence spectroscopy in a physiological buffer over 1 month. The myogenic and osteogenic potentials of the membranes in vitro were assessed using BMP-2-responsive skeletal myoblasts. Finally, their osteoinductive properties in vivo were studied in a preliminary experiment using a mouse ectopic model. Our results showed that the more crosslinked FS membranes enabled a more efficient myoblast differentiation in myotubes. In addition, we showed that a tunable amount of BMP-2 can be loaded into and subsequently released from the membranes, depending on the crosslinking degree and the initial BMP-2 concentration in solution. Only the more crosslinked membranes were found to be osteoinductive in vivo. These polysaccharide-based membranes have strong potential as a periosteum-mimetic scaffold for bone tissue regeneration.
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Affiliation(s)
- Sofia G Caridade
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Avepark - Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco GMR, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal; CNRS, UMR 5628, LMGP, 3 parvis Louis Néel, F-38016 Grenoble, France
| | - Claire Monge
- CNRS, UMR 5628, LMGP, 3 parvis Louis Néel, F-38016 Grenoble, France; Université de Grenoble Alpes, Grenoble Institute of Technology, 3 parvis Louis Néel, F-38016 Grenoble, France
| | - Jorge Almodóvar
- CNRS, UMR 5628, LMGP, 3 parvis Louis Néel, F-38016 Grenoble, France; Université de Grenoble Alpes, Grenoble Institute of Technology, 3 parvis Louis Néel, F-38016 Grenoble, France
| | - Raphael Guillot
- CNRS, UMR 5628, LMGP, 3 parvis Louis Néel, F-38016 Grenoble, France; Université de Grenoble Alpes, Grenoble Institute of Technology, 3 parvis Louis Néel, F-38016 Grenoble, France
| | - Jonathan Lavaud
- Institute Albert Bonniot, INSERM U823, ERL CNRS3148, Grenoble, France
| | | | - Jean-Luc Coll
- Institute Albert Bonniot, INSERM U823, ERL CNRS3148, Grenoble, France
| | - João F Mano
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Avepark - Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco GMR, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
| | - Catherine Picart
- CNRS, UMR 5628, LMGP, 3 parvis Louis Néel, F-38016 Grenoble, France; Université de Grenoble Alpes, Grenoble Institute of Technology, 3 parvis Louis Néel, F-38016 Grenoble, France.
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25
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Borges J, Caridade SG, Silva JM, Mano JF. Unraveling the Effect of the Hydration Level on the Molecular Mobility of Nanolayered Polymeric Systems. Macromol Rapid Commun 2015; 36:405-12. [DOI: 10.1002/marc.201400568] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 12/05/2014] [Indexed: 12/20/2022]
Affiliation(s)
- João Borges
- 3B's Research Group - Biomaterials; Biodegradables and Biomimetics; University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; AvePark, Zona Industrial da Gandra, S. Cláudio do Barco 4806-909 Caldas das Taipas Guimarães Portugal
- ICVS/3B's - PT Government Associate Laboratory; Braga/Guimarães Portugal
| | - Sofia G. Caridade
- 3B's Research Group - Biomaterials; Biodegradables and Biomimetics; University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; AvePark, Zona Industrial da Gandra, S. Cláudio do Barco 4806-909 Caldas das Taipas Guimarães Portugal
- ICVS/3B's - PT Government Associate Laboratory; Braga/Guimarães Portugal
| | - Joana M. Silva
- 3B's Research Group - Biomaterials; Biodegradables and Biomimetics; University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; AvePark, Zona Industrial da Gandra, S. Cláudio do Barco 4806-909 Caldas das Taipas Guimarães Portugal
- ICVS/3B's - PT Government Associate Laboratory; Braga/Guimarães Portugal
| | - João F. Mano
- 3B's Research Group - Biomaterials; Biodegradables and Biomimetics; University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; AvePark, Zona Industrial da Gandra, S. Cláudio do Barco 4806-909 Caldas das Taipas Guimarães Portugal
- ICVS/3B's - PT Government Associate Laboratory; Braga/Guimarães Portugal
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26
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Viciosa MT, Alves NM, Oliveira T, Dionísio M, Mano JF. Confinement Effects on the Dynamic Behavior of Poly(d,l-lactic Acid) upon Incorporation in α-Cyclodextrin. J Phys Chem B 2014; 118:6972-81. [DOI: 10.1021/jp5045783] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. T. Viciosa
- CQFM
(Centro de Química-Física Molecular) and IN (Institute
of Nanoscience and Nanotechnology), Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - N. M. Alves
- 3Bs
Research Group (Biomaterials, Biodegradables and Biomimetics), University of Minho, Headquarters of
the European Institute of Excellence on Tissue Engineering and Regenerative
Medicine, AvePark, 4806-909, Taipas, Guimarães, Portugal
- ICVS/3Bs PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - T. Oliveira
- 3Bs
Research Group (Biomaterials, Biodegradables and Biomimetics), University of Minho, Headquarters of
the European Institute of Excellence on Tissue Engineering and Regenerative
Medicine, AvePark, 4806-909, Taipas, Guimarães, Portugal
- ICVS/3Bs PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - M. Dionísio
- REQUIMTE,
Departamento de Química, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - J. F. Mano
- 3Bs
Research Group (Biomaterials, Biodegradables and Biomimetics), University of Minho, Headquarters of
the European Institute of Excellence on Tissue Engineering and Regenerative
Medicine, AvePark, 4806-909, Taipas, Guimarães, Portugal
- ICVS/3Bs PT Government Associate Laboratory, Braga, Guimarães, Portugal
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27
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Misra A, Parthasarathy R, Ye Q, Singh V, Spencer P. Swelling equilibrium of dentin adhesive polymers formed on the water-adhesive phase boundary: experiments and micromechanical model. Acta Biomater 2014; 10:330-42. [PMID: 24076070 PMCID: PMC3843361 DOI: 10.1016/j.actbio.2013.09.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 08/29/2013] [Accepted: 09/17/2013] [Indexed: 11/21/2022]
Abstract
During their application to the wet, oral environment, dentin adhesives can experience phase separation and composition change, which can compromise the quality of the hybrid layer formed at the dentin-adhesive interface. The chemical composition of polymer phases formed in the hybrid layer can be represented using a ternary water-adhesive phase diagram. In this paper, these polymer phases are characterized using a suite of mechanical tests and swelling experiments. The experimental results were evaluated using a granular micromechanics-based model incorporating poro-mechanical effects and polymer-solvent thermodynamics. The variation in the model parameters and model-predicted polymer properties was studied as a function of composition along the phase boundary. The resulting structure-property correlations provide insight into interactions occurring at the molecular level in the saturated polymer system. These correlations can be used for modeling the mechanical behavior of the hybrid layer, and are expected to aid in the design and improvement of water-compatible dentin adhesive polymers.
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Affiliation(s)
- A Misra
- Bioengineering Research Center, University of Kansas, Lawrence, KS, USA; Civil, Environmental and Architectural Engineering Department, Learned Hall, 1530 W. 15th Street, Lawrence, KS 66045-7609, USA; Department of Mechanical Engineering, University of Kansas, Lawrence, KS, USA.
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28
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Correia CO, Mano JF. Chitosan scaffolds with a shape memory effect induced by hydration. J Mater Chem B 2014; 2:3315-3323. [DOI: 10.1039/c4tb00226a] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chitosan-based porous scaffolds exhibit a shape memory effect triggered by hydration, and they are candidates for applications in minimally invasive surgery.
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Affiliation(s)
- Cristina O. Correia
- 3B's Research Group – Biomaterials, Biodegradables and Biomimetics
- Department of Polymer Engineering
- University of Minho
- Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; AvePark
- Zona Industrial da Gandra S. Cláudio do Barco
| | - João F. Mano
- 3B's Research Group – Biomaterials, Biodegradables and Biomimetics
- Department of Polymer Engineering
- University of Minho
- Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; AvePark
- Zona Industrial da Gandra S. Cláudio do Barco
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29
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Ramani R, Alam S. The effect of an organophosphonite antioxidant on poly(ether ether ketone)/poly(ether imide) blend as studied by quasi-isothermal modulated differential scanning calorimetry and dynamic mechanical thermal analysis methods. HIGH PERFORM POLYM 2013. [DOI: 10.1177/0954008313514102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In the present study, the effect of P-EPQ, an organophosphonite antioxidant, on the glass transition and the viscoelastic behavior of optimized poly(ether ether ketone) (PEEK)/poly(ether imide) (PEI; PEEK/PEI: 50/50) blend has been reported. For this, P-EPQ was added in various proportions to the PEEK/PEI blend and was studied by quasi-isothermal modulated differential scanning calorimetry (Qi-MDSC) and dynamic mechanical thermal analysis (DMTA) methods. The Qi-MDSC results clearly indicate a significant decrease in the glass transition temperature of the blend up to 1 wt% P-EPQ addition. The DMTA measurements revealed a decrease in tan δ peak temperature upon antioxidant addition in agreement with calorimetric results. The shift factors obtained using the time–temperature superposition of DMTA data exhibit Williams–Landel–Ferry behavior, and the fractional free volume of the blend increases with increase in antioxidant addition (up to 1 wt%). The “master curve” of storage modulus predicts high modulus for the blend with 1 wt% antioxidant, revealing its suitability for high-impact applications.
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Affiliation(s)
- R. Ramani
- Polymer Science Division, Defence Materials and Stores Research and Development Establishment (DMSRDE), Kanpur, Uttar Pradesh, India
| | - S. Alam
- Polymer Science Division, Defence Materials and Stores Research and Development Establishment (DMSRDE), Kanpur, Uttar Pradesh, India
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30
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John J, Klepac D, Petković Didović M, Raju KVSN, Pius A, Andreis M, Valić S, Thomas S. Relaxations and chain dynamics of sequential full interpenetrating polymer networks based on natural rubber and poly(methyl methacrylate). POLYM INT 2013. [DOI: 10.1002/pi.4634] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jacob John
- Department of Chemistry; Gandhigram Rural University; Dindigul Tamil Nadu 624302 India
- Department of Polymer Science and Engineering, 120 Governors Dr; University of Massachusetts-Amherst; Amherst MA 01003 USA
| | - Damir Klepac
- Department of Chemistry and Biochemistry, School of Medicine; University of Rijeka; Braće Branchetta 20 51000 Rijeka Croatia
| | - Mirna Petković Didović
- Department of Chemistry and Biochemistry, School of Medicine; University of Rijeka; Braće Branchetta 20 51000 Rijeka Croatia
| | - K. V. S. N. Raju
- Division of Organic Coatings and Polymers; Indian Institute of Chemical Technology; Hyderabad 500607 India
| | - Anitha Pius
- Department of Chemistry; Gandhigram Rural University; Dindigul Tamil Nadu 624302 India
| | - Mladen Andreis
- Rudjer Bošković Institute; Bijenička 54 10000 Zagreb Croatia
| | - Srećko Valić
- Department of Chemistry and Biochemistry, School of Medicine; University of Rijeka; Braće Branchetta 20 51000 Rijeka Croatia
- Rudjer Bošković Institute; Bijenička 54 10000 Zagreb Croatia
| | - Sabu Thomas
- School of Chemical Sciences; Mahatma Gandhi University; P. D. Hills Kerala 686560 India
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31
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Gunasekera K, Bhosle S, Boolchand P, Micoulaut M. Superstrong nature of covalently bonded glass-forming liquids at select compositions. J Chem Phys 2013; 139:164511. [DOI: 10.1063/1.4826463] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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32
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Evans CM, Deng H, Jager WF, Torkelson JM. Fragility is a Key Parameter in Determining the Magnitude of Tg-Confinement Effects in Polymer Films. Macromolecules 2013. [DOI: 10.1021/ma401017n] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
| | | | - Wolter F. Jager
- Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628
BL Delft, The Netherlands
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33
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Nanoconfined segmental dynamics in miscible polymer blend nanocomposites: the influence of the geometry of nanoparticles. IRANIAN POLYMER JOURNAL 2013. [DOI: 10.1007/s13726-013-0160-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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34
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Koerner H, Strong RJ, Smith ML, Wang DH, Tan LS, Lee KM, White TJ, Vaia RA. Polymer design for high temperature shape memory: Low crosslink density polyimides. POLYMER 2013. [DOI: 10.1016/j.polymer.2012.11.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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35
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Thermal, Optical, and Static/Dynamic Mechanical Properties of Linear-core Crosslinked Star Polymer Blends. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201100143] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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36
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Qazvini NT, Chehrazi E. Glass Transition Behavior and Dynamic Fragility of PMMA-SAN Miscible Blend-Clay Nanocomposites. J MACROMOL SCI B 2011. [DOI: 10.1080/00222348.2011.563179] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- N. Taheri Qazvini
- a School of Chemistry , University College of Science, University of Tehran , Tehran, Iran
- b Biomaterials Research Center (BRC) , University of Tehran , Tehran, Iran
| | - E. Chehrazi
- c Mahshahr Branch , Amirkabir University of Technology , Mahshahr, Iran
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37
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Yan LP, Wang YJ, Ren L, Wu G, Caridade SG, Fan JB, Wang LY, Ji PH, Oliveira JM, Oliveira JT, Mano JF, Reis RL. Genipin-cross-linked collagen/chitosan biomimetic scaffolds for articular cartilage tissue engineering applications. J Biomed Mater Res A 2010; 95:465-75. [DOI: 10.1002/jbm.a.32869] [Citation(s) in RCA: 255] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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38
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Masser KA, Runt J. Dynamics of Polymer Blends of a Strongly Interassociating Homopolymer with Poly(vinyl methyl ether) and Poly(2-vinylpyridine). Macromolecules 2010. [DOI: 10.1021/ma1011396] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kevin A. Masser
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
| | - James Runt
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
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39
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Ornaghi HL, Bolner AS, Fiorio R, Zattera AJ, Amico SC. Mechanical and dynamic mechanical analysis of hybrid composites molded by resin transfer molding. J Appl Polym Sci 2010. [DOI: 10.1002/app.32388] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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40
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Li Y, Venkateshan K, Sun XS. Mechanical and thermal properties, morphology and relaxation characteristics of poly(lactic acid) and soy flour/wood flour blends. POLYM INT 2010. [DOI: 10.1002/pi.2834] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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41
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42
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McColl J, Horvath R, Aref A, Larcombe L, Chianella I, Morgan S, Yakubov GE, Ramsden JJ. Polyphenol control of cell spreading on glycoprotein substrata. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2009; 20:841-51. [PMID: 19323893 DOI: 10.1163/156856209x427023] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Cell-surface contacts are vital for many eukaryotic cells. The surface provides anchorage (facilitating spreading and proliferation), is involved in sensation, i.e., via mechano-, osmo- and chemoreceptors, and in addition nutrients may also be supplied via vessels adjacent to the basal lamina. Hence, the ability to manipulate the surface characteristics provides a mechanism for directly influencing cell behaviour. Applications such as medical implants and tissue engineering require biocompatible, stable surfaces for controlling cell behaviour. Mucin-coated surfaces inhibit cell spreading compared with poly(L-lysine) in vitro; here, we show that a composite layer assembled from mucin-EGCg aggregates counters the inhibition. Although the anti-spreading effects of the glycoprotein substratum on cell behaviour are similar to those observed for pure polysaccharide surfaces, the reversal of cell spreading inhibition by the admixture of polyphenol/glycoprotein substrata is remarkable and unexpected. Possible applications for a composite glycoprotein-polyphenol layer include medical devices, in particular for those operating at mucosal interfaces such as the oral, tracheal or gastrointestinal tract cavities, wound healing, cancer control and the controlled growth of therapeutic cell cultures.
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Affiliation(s)
- James McColl
- Nanotechnology Centre, Cranfield University, Cranfield MK43 0AL, Bedfordshire, UK.
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43
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Liu J, Cao D, Zhang L. Static and dynamic properties of model elastomer with various cross-linking densities: A molecular dynamics study. J Chem Phys 2009; 131:034903. [DOI: 10.1063/1.3179691] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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44
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Effect of solvent-dependent viscoelastic properties of chitosan membranes on the permeation of 2-phenylethanol. Carbohydr Polym 2009. [DOI: 10.1016/j.carbpol.2008.09.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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45
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Mano JF. Viscoelastic Properties of Chitosan with Different Hydration Degrees as Studied by Dynamic Mechanical Analysis. Macromol Biosci 2008; 8:69-76. [PMID: 17902189 DOI: 10.1002/mabi.200700139] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Dynamic mechanical analysis, DMA, is an adequate technique for characterizing the mechanical features of biomaterials, as one can use test conditions that can more closely simulate the physiological environments in which they are going to be applied. In this work it was possible to perform different tests on chitosan membranes using low/moderate hydration levels, as well in completely wet conditions. In the first case the data obtained at different relative humidity environments were rationalized under a time-humidity superposition principle, where a master curve for the storage modulus could be obtained along a wide range of frequencies. The temperature dependence of the shift factors exhibited a curvature opposite to that expected by the WLF equation, and is consistent with relaxation dynamics behavior below the glass transition. Temperature scans above room temperature in both dry and wet conditions did not reveal strong variations in the viscoelastic properties. It was possible to follow in real time the water uptake in an initially-dry membrane. During the initial strong and fast decrease of the storage modulus the loss factor exhibited a peak that should correspond to the occurrence of the glass transition resulting from the plasticization effect of water. Upon equilibration the loss factor reached similar values as for the dry material (tandelta approximately equal to 0.5). The viscoelastic characterization reported in this work for chitosan may be useful in the use of such material for a variety of biomedical applications.
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Affiliation(s)
- João F Mano
- 3B's Research Group--Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar, Braga, Portugal.
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46
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Li Q, Hua R, Cheah IJ, Chou KC. Surface Structure Relaxation of Poly(methyl methacrylate). J Phys Chem B 2007; 112:694-7. [DOI: 10.1021/jp072147j] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qifeng Li
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Rui Hua
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Ignatius J. Cheah
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Keng C. Chou
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
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47
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Dynamic relaxation characteristics of crosslinked poly(ethylene oxide) copolymer networks: Influence of short chain pendant groups. POLYMER 2007. [DOI: 10.1016/j.polymer.2007.10.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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48
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Théneau C, Salmerón Sánchez M, Rodríguez Hernández JC, Monleón Pradas M, Saiter JM, Gómez Ribelles JL. The kinetics of the structural relaxation process in PHEMA-silica nanocomposites based on an equation for the configurational entropy. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2007; 24:69-77. [PMID: 17876514 DOI: 10.1140/epje/i2007-10214-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Accepted: 08/02/2007] [Indexed: 05/17/2023]
Abstract
The enthalpy relaxation of polymer-silica nanocomposites prepared by simultaneous polymerization of poly(2-hydroxyethyl methacrylate) (PHEMA) and tetraethyloxysilane, TEOS, a silica precursor, is investigated. Both the glass transition temperature, Tg, and the temperature interval of the glass transition, DeltaTg , increase as the silica content in the sample does. Structural relaxation experiments show that the temperature interval in which conformational motions take place broadens as the silica content in the hybrid increases. A phenomenological model based on the evolution of the configurational entropy during the structural relaxation process, the SC model, has been used for determining the temperature dependence of the relaxation times during the process. The results show an increase of the fragility of the polymer as the silica content increases, a feature that can be related to the broadening of the distribution of relaxation times characterized by the beta parameter of the stretched exponential distribution. On another hand the silica content increase produces a significant change of the relaxation times in the glassy state.
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Affiliation(s)
- C Théneau
- Center for Biomaterials, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain
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Sabater i Serra R, Escobar Ivirico JL, Meseguer Dueñas JM, Andrio Balado A, Gómez Ribelles JL, Salmerón Sánchez M. Dielectric relaxation spectrum of poly (epsilon-caprolactone) networks hydrophilized by copolymerization with 2-hydroxyethyl acrylate. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2007; 22:293-302. [PMID: 17415514 DOI: 10.1140/epje/e2007-00036-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2006] [Indexed: 05/14/2023]
Abstract
The dielectric relaxation spectrum of polycaprolactone (PCL) networks hydrophilized with different amounts of 2-hydroxyethyl acrylate (HEA) is investigated. PCL is a semicrystalline polyester with a complex relaxation spectrum that includes the main alpha relaxation and two secondary modes (beta, gamma) at lower temperatures. The overlapping of the different relaxational modes was split by using several Havriliak-Negami functions. Crosslinking the material modifies the dynamics of the main relaxation process as reflected by the parameters that characterize the Vogel behavior of the process and the dynamic fragility. The incorporation of HEA units in the network results in a material with microphase separation: two alpha processes are detected, the one corresponding to the PCL chains and the new one associated to nanometric regions that contain different amount of both comonomers. The incorporation of the HEA units in the system involves the presence of a new beta(sw) relaxation due to the link of two side chains by water molecules through hydrogen bonding.
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Affiliation(s)
- R Sabater i Serra
- Center for Biomaterials, Universidad Politécnica de Valencia, 46022, Valencia, Spain
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Kalakkunnath S, Kalika DS, Lin H, Raharjo RD, Freeman BD. Molecular Dynamics of Poly(ethylene glycol) and Poly(propylene glycol) Copolymer Networks by Broadband Dielectric Spectroscopy. Macromolecules 2007. [DOI: 10.1021/ma070016a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sumod Kalakkunnath
- Department of Chemical and Materials Engineering and Center for Manufacturing, University of Kentucky, Lexington, Kentucky 40506-0046, and Center for Energy and Environmental Resources, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78758
| | - Douglass S. Kalika
- Department of Chemical and Materials Engineering and Center for Manufacturing, University of Kentucky, Lexington, Kentucky 40506-0046, and Center for Energy and Environmental Resources, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78758
| | - Haiqing Lin
- Department of Chemical and Materials Engineering and Center for Manufacturing, University of Kentucky, Lexington, Kentucky 40506-0046, and Center for Energy and Environmental Resources, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78758
| | - Roy D. Raharjo
- Department of Chemical and Materials Engineering and Center for Manufacturing, University of Kentucky, Lexington, Kentucky 40506-0046, and Center for Energy and Environmental Resources, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78758
| | - Benny D. Freeman
- Department of Chemical and Materials Engineering and Center for Manufacturing, University of Kentucky, Lexington, Kentucky 40506-0046, and Center for Energy and Environmental Resources, Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78758
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