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All-polyethylene compositions of ultrahigh molecular weight polyethylene (UHMWPE) synthesized in one-step ethylene polymerization with combinations of zirconocene and iron-based catalysts. IRANIAN POLYMER JOURNAL 2023. [DOI: 10.1007/s13726-023-01141-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Cardoso PM, Ueki MM, Barbosa JDV, Barbosa WT, Lazarus B, Azevedo JB. Development and Characterization of LLDPE Blends with Different UHMWPE Concentrations Obtained by Hot Pressing. Polymers (Basel) 2022; 14:polym14183723. [PMID: 36145867 PMCID: PMC9501252 DOI: 10.3390/polym14183723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/23/2022] [Accepted: 08/30/2022] [Indexed: 11/29/2022] Open
Abstract
To modify its characteristics, expand its applicability, and, in some cases, its processability, new blends using ultra-high-molecular-weight polyethylene (UHMWPE) have been developed. In this study, three different formulations of linear low-density polyethylene (LLDPE) and UHMWPE blends were prepared with 15, 30, and 45% (% w/w) UHMWPE in the LLDPE matrix. All mixtures were prepared by hot pressing and were immersed in water for one hour afterwards at a controlled temperature of 90 °C to relieve the internal stresses that developed during the forming process. The thermal characterization showed that the blends showed endothermic peaks with different melting temperatures, which may be the result of co-crystallization without mixing between the polymers during the forming process. The mechanical characteristics presented are typical of a ductile material, but with the increase in the percentage of UHMWPE, there was a decrease in the ductility of the blends, as the elongation at rupture of the blends was higher than that of the pure components. The morphologies observed by SEM indicate that there were two phases in the blends. This is the result of the system’s immiscibility due to the mode of preparation of the blends, wherein the two polymers may not have mixed intimately, confirming the results found with the thermal analyses.
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Affiliation(s)
- Pollyana Melo Cardoso
- Department of Materials, University Center Senai Cimatec, Salvador 41650-010, Bahia, Brazil
- Graduate Program in Materials Science and Engineering—P2CEM, Federal University of Sergipe (UFS), Aracaju 49100-000, Sergipe, Brazil
- Pós-Graduate Program PPGGETEC, University Center Senai Cimatec, Salvador 41650-010, Bahia, Brazil
| | - Marcelo Massayoshi Ueki
- Graduate Program in Materials Science and Engineering—P2CEM, Federal University of Sergipe (UFS), Aracaju 49100-000, Sergipe, Brazil
| | - Josiane Dantas Viana Barbosa
- Pós-Graduate Program PPGGETEC, University Center Senai Cimatec, Salvador 41650-010, Bahia, Brazil
- Correspondence: ; Tel.: +55-7198-868-3231
| | - Willams Teles Barbosa
- Pós-Graduate Program PPGGETEC, University Center Senai Cimatec, Salvador 41650-010, Bahia, Brazil
| | - Benjamin Lazarus
- Materials Science and Engineering Program, University of California San Diego, San Diego, CA 92093, USA
| | - Joyce Batista Azevedo
- Institute of Science, Technology and Innovation, Federal University of Bahia, Salvador 42809-000, Bahia, Brazil
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Zhang Y, Di Y, Ye C, Zhang L, Tang X, Shu B, Yan X, Li W, Wang J, Yang Y. Morphology evolution and mechanical property enhancement of linear low‐density polyethylene by adding disentangled ultrahigh molecular weight polyethylene. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yu Zhang
- Department of Polymer Science and Engineering, School of Material Science and Chemical Engineering Ningbo University Ningbo Zhejiang China
- Ningbo Research Institute Zhejiang University Ningbo China
| | - Yutao Di
- Ningbo Research Institute Zhejiang University Ningbo China
| | - Chunlin Ye
- State Key Laboratory of Polyolefins and Catalysis, Shanghai Key Laboratory of Catalysis Technology for Polyolefins Shanghai Research Institute of Chemical Industry Co., Ltd. Shanghai China
| | - Letian Zhang
- State Key Laboratory of Polyolefins and Catalysis, Shanghai Key Laboratory of Catalysis Technology for Polyolefins Shanghai Research Institute of Chemical Industry Co., Ltd. Shanghai China
| | - Xin Tang
- Department of Polymer Science and Engineering, School of Material Science and Chemical Engineering Ningbo University Ningbo Zhejiang China
- Ningbo Research Institute Zhejiang University Ningbo China
| | - Baoqiang Shu
- Ningbo Research Institute Zhejiang University Ningbo China
| | - Xiang Yan
- Ningbo Research Institute Zhejiang University Ningbo China
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Wei Li
- Department of Polymer Science and Engineering, School of Material Science and Chemical Engineering Ningbo University Ningbo Zhejiang China
- Ningbo Research Institute Zhejiang University Ningbo China
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Jingdai Wang
- Ningbo Research Institute Zhejiang University Ningbo China
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Yongrong Yang
- Ningbo Research Institute Zhejiang University Ningbo China
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
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Cardoso PSM, Ueki MM, Barbosa JDV, Garcia Filho FC, Lazarus BS, Azevedo JB. The Effect of Dialkyl Peroxide Crosslinking on the Properties of LLDPE and UHMWPE. Polymers (Basel) 2021; 13:3062. [PMID: 34577963 PMCID: PMC8470150 DOI: 10.3390/polym13183062] [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: 08/02/2021] [Revised: 08/31/2021] [Accepted: 09/07/2021] [Indexed: 11/30/2022] Open
Abstract
Peroxide has been considered a chemical agent that can be used to tune the properties of polymeric materials. This research evaluated the influence of different concentrations of dialkyl peroxides on the mechanical, thermal, and morphological properties of linear low-density polyethylene (LLDPE) and ultra-high molecular weight polyethylene (UHMWPE). The neat polymer, as well as those with the addition of 1% and 2% by mass of dialkyl peroxides, were subjected to compression molding and immersion in water for 1 h, under controlled temperatures of 90 °C. The values of the gel content found in the samples indicated that the addition of peroxide to the LLDPE and to the UHMWPE promoted the formation of a reticulated network. The structure obtained by the crosslinking led to less reorganization of the chains during the crystallization process, resulting in the formation of imperfect crystals and, consequently, in the reduction in melting temperatures, crystallization and enthalpy. The mechanical properties were altered with the presence of the crosslinker. The polymers presented had predominant characteristics of a ductile material, with the occurrence of crazing with an increased peroxide content.
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Affiliation(s)
- Pollyana S. M. Cardoso
- Department of Materials, University Center SENAI CIMATEC, Salvador 41650-010, BA, Brazil;
- Graduate Program in Materials Science and Engineering—P2CEM, Federal University of Sergipe (UFS), Aracaju 49100-000, SE, Brazil;
| | - Marcelo M. Ueki
- Graduate Program in Materials Science and Engineering—P2CEM, Federal University of Sergipe (UFS), Aracaju 49100-000, SE, Brazil;
| | - Josiane D. V. Barbosa
- Department of Materials, University Center SENAI CIMATEC, Salvador 41650-010, BA, Brazil;
| | | | - Benjamin S. Lazarus
- Materials Science and Engineering Program, University of Califórnia San Diego, San Diego, CA 92093, USA;
| | - Joyce B. Azevedo
- Institute of Science, Technology and Innovation, Federal University of Bahia, Salvador 42809-000, BA, Brazil;
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Ushakova TM, Starchak EE, Gostev SS, Grinev VG, Krasheninnikov VG, Gorenberg AY, Novokshenova LA. Polymer–Polymer Blends of Ultrahigh-Molecular-Weight Polyethylene and Low-Molecular-Weight High-Density Polyethylene: Synthesis, Morphology, and Properties. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2020. [DOI: 10.1134/s1990793120030124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ferreira EHC, Andrade RJE, Fechine GJM. The “Superlubricity State” of Carbonaceous Fillers on Polyethylene-Based Composites in a Molten State. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01746] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Eder. H. C. Ferreira
- Mackenzie Institute for Research in Graphene and Nanotechnologies − MackGraphe, Mackenzie Presbyterian University, Rua da Consolação 896, São Paulo, SP 01302-907, Brazil
| | - Ricardo. J. E. Andrade
- Mackenzie Institute for Research in Graphene and Nanotechnologies − MackGraphe, Mackenzie Presbyterian University, Rua da Consolação 896, São Paulo, SP 01302-907, Brazil
| | - Guilhermino J. M. Fechine
- Mackenzie Institute for Research in Graphene and Nanotechnologies − MackGraphe, Mackenzie Presbyterian University, Rua da Consolação 896, São Paulo, SP 01302-907, Brazil
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Yang HW, Ju SP, Chen HY, Cheng YC, Hsu WL. Ovalbumin-Loaded Gelation Microneedles Made of Predictive Formulation by Molecular Dynamics Simulation for Enhancement of Skin Immunization. ACS Biomater Sci Eng 2019; 5:6012-6021. [PMID: 33405723 DOI: 10.1021/acsbiomaterials.9b01167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Gelation microneedle (GMNs) based vaccinations with tumor antigens have been considered to be an attractive method for transcutaneous immunization because of their superior ability to deliver vaccines through the stratum corneum (SC) in a minimally invasive manner, which subsequently induces adaptive antitumor immunity. In this study, molecular dynamics (MD) uniaxial tension simulations were conducted to predict the formulation of poly(vinyl alcohol) (PVA; possesses high water solubility) and poly(methyl vinyl ether-altmaleic anhydride) (PMVEMA; possesses high mechanical strength) blend that has the strongest mechanical properties. To validate the accuracy of the Dreiding potential for these two polymers, their densities and Hildebrand solubility parameters were first predicted using MD simulations. These values exhibited good agreement with the corresponding experimental results, indicating the accuracy of the Dreiding potential for the polymers. Regarding the simulation results, the number density of H-bonds between PVA and PMVEMA was the highest at 50% PMVEMA, which can significantly enhance the mechanical strength of pristine PVA for enhanced skin immunization. In terms of further experimental validation, evidence from mechanical strength, solubility, in vitro porcine skin penetration tests, and in vivo immunization were consistent with our simulation predictions. In addition, our results indicated that delivery of ovalbumin (OVA) using GMN patches fabricated using PVA/PMVEMA (50%/50%) provided even stronger immune responses. Using this molecular simulation procedure, the optimal fraction of PVA/PMVEMA composite for the strongest mechanical properties can be rapidly predicted to reduce research time and costs in related experiments.
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Affiliation(s)
- Hung-Wei Yang
- Institute of Medical Science and Technology, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China
| | - Shin-Pon Ju
- Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China.,Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Hsing-Yin Chen
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Yi-Chi Cheng
- Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China
| | - Wen-Lin Hsu
- Institute of Medical Science and Technology, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China
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Sun S, Li Q, Zhao N, Jiang J, Zhang K, Hou J, Wang X, Liu G. Preparation of highly interconnected porous poly(ε-caprolactone)/poly(lactic acid) scaffolds via supercritical foaming. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4427] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shuhao Sun
- School of Mechanics and Engineering Science; Zhengzhou University, National Center for International Joint research of Micro-Nano Molding Technology; Zhengzhou Henan China
| | - Qian Li
- School of Mechanics and Engineering Science; Zhengzhou University, National Center for International Joint research of Micro-Nano Molding Technology; Zhengzhou Henan China
| | - Na Zhao
- School of Mechanics and Engineering Science; Zhengzhou University, National Center for International Joint research of Micro-Nano Molding Technology; Zhengzhou Henan China
| | - Jing Jiang
- School of Mechanics and Engineering Science; Zhengzhou University, National Center for International Joint research of Micro-Nano Molding Technology; Zhengzhou Henan China
- School of Chemical Engineering and Energy; Zhengzhou University; Zhengzhou Henan China
| | - Kangkang Zhang
- School of Mechanics and Engineering Science; Zhengzhou University, National Center for International Joint research of Micro-Nano Molding Technology; Zhengzhou Henan China
| | - Jianhua Hou
- School of Mechanics and Engineering Science; Zhengzhou University, National Center for International Joint research of Micro-Nano Molding Technology; Zhengzhou Henan China
| | - Xiaofeng Wang
- School of Mechanics and Engineering Science; Zhengzhou University, National Center for International Joint research of Micro-Nano Molding Technology; Zhengzhou Henan China
| | - Guoji Liu
- School of Chemical Engineering and Energy; Zhengzhou University; Zhengzhou Henan China
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