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Htira T, Zid S, Zinet M, Espuche E. Finite Element Analysis of Gas Diffusion in Polymer Nanocomposite Systems Containing Rod-like Nanofillers. Polymers (Basel) 2021; 13:polym13162615. [PMID: 34451155 PMCID: PMC8399843 DOI: 10.3390/polym13162615] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 07/22/2021] [Accepted: 08/03/2021] [Indexed: 11/16/2022] Open
Abstract
Polymer-based films with improved gas barrier properties are of great interest for a large range of applications, including packaging and coatings. The barrier effect is generally obtained via the addition of a sufficient amount of impermeable nanofillers within the polymer matrix. Due to their low environmental footprint, bio-based nanocomposites such as poly(lactic acid)-cellulose nanocrystal (PLA-CNC) nanocomposites seem to be an interesting alternative to synthetic-polymer-based nanocomposites. The morphology of such systems consists of the dispersion of impermeable rod-like fillers of finite length in a more permeable matrix. The aim of this work is to analyze, through finite element modeling (FEM), the diffusion behavior of 3D systems representative of PLA-CNC nanocomposites, allowing the determination of the nanocomposites' effective diffusivity. Parametric studies are carried out to evaluate the effects of various parameters, such as the filler volume fraction, aspect ratio, polydispersity, and agglomeration, on the improvement of the barrier properties. The role of the filler-matrix interfacial area (or interphase) is also investigated and is shown to be particularly critical to the overall barrier effect for highly diffusive interphases.
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Li B, Zhao G, Wang G, Zhang L, Hou J, Gong J. A green strategy to regulate cellular structure and crystallization of poly(lactic acid) foams based on pre-isothermal cold crystallization and CO2 foaming. Int J Biol Macromol 2019; 129:171-180. [DOI: 10.1016/j.ijbiomac.2019.02.026] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 02/04/2019] [Accepted: 02/04/2019] [Indexed: 01/18/2023]
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Ang HY, Toong D, Chow WS, Seisilya W, Wu W, Wong P, Venkatraman SS, Foin N, Huang Y. Radiopaque Fully Degradable Nanocomposites for Coronary Stents. Sci Rep 2018; 8:17409. [PMID: 30479353 PMCID: PMC6258706 DOI: 10.1038/s41598-018-35663-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 11/09/2018] [Indexed: 12/13/2022] Open
Abstract
Bioresorbable scaffolds (BRS) were introduced to overcome limitations of current metallic drug-eluting stents and poly-L-lactide (PLLA) has been used in the fabrication of BRS due to its biodegradability and biocompatibility. However, such polymers have weaker mechanical properties as compared to metals, limiting their use in BRS. We hypothesized that nanofillers can be used to enhance the mechanical properties considerably in PLLA. To this end, polymer-matrix composites consisting of PLLA reinforced with 5-20 wt% barium sulfate (BaSO4) nanofillers as a potential BRS material was evaluated. Stearic-acid (SA) modified BaSO4 nanofillers were used to examine the effect of functionalization. Rigid nanofillers improved the tensile modulus and strength of PLLA (60% and 110% respectively), while the use of SA-BaSO4 caused a significant increase (~110%) in the elongation at break. Enhancement in mechanical properties is attributed to functionalization which decreased the agglomeration of the nanofillers and improved dispersion. The nanocomposites were also radiopaque. Finite element analysis (FEA) showed that scaffold fabricated from the novel nanocomposite material has improved scaffolding ability, specifically that the strut thickness could be decreased compared to the conventional PLLA scaffold. In conclusion, BaSO4/PLLA-based nanocomposites could potentially be used as materials for BRS with improved mechanical and radiopaque properties.
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Affiliation(s)
- Hui Ying Ang
- National Heart Centre Singapore, 5 Hospital Drive, 169609, Singapore, Singapore
| | - Daniel Toong
- School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore, Singapore
| | - Wei Shoon Chow
- School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore, Singapore
| | - Welly Seisilya
- School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore, Singapore
| | - Wei Wu
- Department of Mechanical Engineering, University of Texas at San Antonio, 1 UTSA Circle, San Antonio, TX, 78249, USA
| | - Philip Wong
- National Heart Centre Singapore, 5 Hospital Drive, 169609, Singapore, Singapore
| | - Subbu S Venkatraman
- School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore, Singapore
| | - Nicolas Foin
- National Heart Centre Singapore, 5 Hospital Drive, 169609, Singapore, Singapore
- Duke-NUS Medical School, 8 College Road, 169857, Singapore, Singapore
| | - Yingying Huang
- School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore, Singapore.
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Kim DH, Ryu YS, Kim SH. Improvements in the oxygen barrier property of polypropylene nanocomposites. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4379] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Dong Hyun Kim
- Department of Organic and Nano Engineering; Hanyang University; 222 Wangsimni-ro, Seongdong-gu Seoul 04763 South Korea
| | - Yeon Sung Ryu
- Department of Organic and Nano Engineering; Hanyang University; 222 Wangsimni-ro, Seongdong-gu Seoul 04763 South Korea
| | - Seong Hun Kim
- Department of Organic and Nano Engineering; Hanyang University; 222 Wangsimni-ro, Seongdong-gu Seoul 04763 South Korea
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Zid S, Zinet M, Espuche E. Modeling diffusion mass transport in multiphase polymer systems for gas barrier applications: A review. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/polb.24574] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sarra Zid
- Univ Lyon, Université Lyon 1, CNRS UMR 5223, Ingénierie des Matériaux Polymères; F-69622 Villeurbanne France
| | - Matthieu Zinet
- Univ Lyon, Université Lyon 1, CNRS UMR 5223, Ingénierie des Matériaux Polymères; F-69622 Villeurbanne France
| | - Eliane Espuche
- Univ Lyon, Université Lyon 1, CNRS UMR 5223, Ingénierie des Matériaux Polymères; F-69622 Villeurbanne France
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Li T, Dai Y, Li J, Guo S, Xie G. A high-barrier PP/EVOH membrane prepared through the multistage biaxial-stretching extrusion. J Appl Polym Sci 2017. [DOI: 10.1002/app.45016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ting Li
- The State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065
- Energy Conversion R&D Center; Central Academy of Dongfang Electric Corporation; Chengdu 611731 China
| | - Yingying Dai
- The State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065
| | - Jiang Li
- The State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065
| | - Shaoyun Guo
- The State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065
| | - Guangyou Xie
- Energy Conversion R&D Center; Central Academy of Dongfang Electric Corporation; Chengdu 611731 China
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