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Ge X, Zhang L, Wei X, Long X, Han Y. Plasma Surface Treatment and Application of Polyvinyl Alcohol/Polylactic Acid Electrospun Fibrous Hemostatic Membrane. Polymers (Basel) 2024; 16:1635. [PMID: 38931986 PMCID: PMC11207798 DOI: 10.3390/polym16121635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 06/02/2024] [Accepted: 06/07/2024] [Indexed: 06/28/2024] Open
Abstract
In this study, an improved PVA/PLA fibrous hemostatic membrane was prepared by electrospinning technology combined with air plasma modification. The plasma treatment was used to modify PLA to enhance the interlayer bonding between the PVA and PLA fibrous membranes first, then modify the PVA to improve the hemostatic capacity. The surfaces of the PLA and PVA were oxidized after air plasma treatment, the fibrous diameter was reduced, and roughness was increased. Plasma treatment enhanced the interfacial bond strength of PLA/PVA composite fibrous membrane, and PLA acted as a good mechanical support. Plasma-treated PVA/PLA composite membranes showed an increasing liquid-enrichment capacity of 350% and shortened the coagulation time to 258 s. The hemostatic model of the liver showed that the hemostatic ability of plasma-treated PVA/PLA composite membranes was enhanced by 79% compared to untreated PVA membranes, with a slight improvement over commercially available collagen. The results showed that the plasma-treated PVA/PLA fibers were able to achieve more effective hemostasis, which provides a new strategy for improving the hemostatic performance of hemostatic materials.
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Affiliation(s)
| | | | | | | | - Yingchao Han
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan University of Technology, Wuhan 430070, China; (X.G.); (L.Z.); (X.W.); (X.L.)
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Osolnik U, Vek V, Korošec RC, Oven P, Poljanšek I. Integration of wood-based components - Cellulose nanofibrils and tannic acid - into a poly(vinyl alcohol) matrix to improve functional properties. Int J Biol Macromol 2024; 256:128495. [PMID: 38035953 DOI: 10.1016/j.ijbiomac.2023.128495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 10/29/2023] [Accepted: 11/27/2023] [Indexed: 12/02/2023]
Abstract
Poly(vinyl alcohol) (PVA) biocomposite films reinforced with cellulose nanofibrils (CNF) and biologically active tannic acid (TA) were prepared. The influence of different concentrations of CNF and TA in the PVA polymer matrix was investigated in terms of mechanical properties, thermal properties and hydrophobicity improvement of the prepared films. The results showed that in all cases the addition of CNF and TA improved the values of tensile strength and elastic modulus. The PVA film with 10 % CNF exhibited a 30 % higher tensile strength, and the three-component PVA film with 2 % CNF and 10 % TA (P2C10T) exhibited a 40 % higher tensile strength compared to the neat PVA film. The thermal properties (Tg, Tonset) of the PVA biocomposite films were greatly improved, with a significant effect observed for the three-component PVA films. The Tg of the PVA film with 10 % CNF and 10 % TA was 87 °C, 12 °C higher than that of the neat PVA film. For three-component PVA biocomposites with 4 % and 6 % CNF and with all weight percentages of TA, the Tonset shifted to a higher temperature range by about 30 °C compared to the neat PVA film. The PVA film with 2 % CNF and 10 % TA exhibited about a 20° higher contact angle than the neat PVA film. Moreover, the addition of both fillers to the PVA matrix resulted in PVA biocomposites with lower water absorption. PVA film with 10 % TA absorbed about 90 % less water and PVA film with 10 % CNF and 10 % TA absorbed about 80 % less water than the neat PVA film after the films were soaked in water for one hour. The better properties of the composite films produced are due to hydrogen and ester bonds between the components of the composite, which was confirmed by FT-IR spectroscopy. Antioxidant effective films were also obtained due to the biologically active TA to the PVA and PVA/CNF systems.
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Affiliation(s)
- Urša Osolnik
- University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia.
| | - Viljem Vek
- University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia.
| | - Romana Cerc Korošec
- University of Ljubljana, Faculty of Chemistry and Chemical Technology, Večna pot 113, SI-1000 Ljubljana, Slovenia.
| | - Primož Oven
- University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia.
| | - Ida Poljanšek
- University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia.
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Kobayashi M, Nishimura F, Kim JH, Yonezawa S. Dyeable Hydrophilic Surface Modification for PTFE Substrates by Surface Fluorination. MEMBRANES 2023; 13:57. [PMID: 36676864 PMCID: PMC9865303 DOI: 10.3390/membranes13010057] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/25/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
Polytetrafluoroethylene (PTFE) is the most widely used fluoropolymer that has various functionalities such as heat resistance, chemical resistance, abrasion resistance, and non-adhesiveness. However, PTFE is difficult to dye because of its high water repellency. In this study, the PTFE surface was modified by a combination of gold sputtering and surface fluorination to improve dyeability. X-ray photoelectron spectroscopy indicated that, compared with the untreated sample, the gold-sputtered and acid-washed surface of PTFE had a negligible number of C-F terminals. Furthermore, the intensity of the C-C peak increased drastically. The polar groups (C=O and C-Fx) increased after surface fluorination, which enhanced the electronegativity of the surface according to the zeta potential results. Dyeing tests with methylene blue basic dye showed that the dye staining intensity on the surface of fluorinated PTFE samples was superior to other samples. It is due to the increased surface roughness and the negatively charged surface of fluorinated PTFE samples. The modified PTFE substrates may find broad applicability for dyeing, hydrophilic membrane filters, and other adsorption needs.
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Affiliation(s)
- Mizuki Kobayashi
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Fumihiro Nishimura
- Cooperative Research Center, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Jae-Ho Kim
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Susumu Yonezawa
- Cooperative Research Center, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
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Lakshmy KS, Lal D, Nair A, Babu A, Das H, Govind N, Dmitrenko M, Kuzminova A, Korniak A, Penkova A, Tharayil A, Thomas S. Pervaporation as a Successful Tool in the Treatment of Industrial Liquid Mixtures. Polymers (Basel) 2022; 14:polym14081604. [PMID: 35458354 PMCID: PMC9029804 DOI: 10.3390/polym14081604] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/02/2022] [Accepted: 04/08/2022] [Indexed: 02/01/2023] Open
Abstract
Pervaporation is one of the most active topics in membrane research, and it has time and again proven to be an essential component for chemical separation. It has been employed in the removal of impurities from raw materials, separation of products and by-products after reaction, and separation of pollutants from water. Given the global problem of water pollution, this approach is efficient in removing hazardous substances from water bodies. Conventional processes are based on thermodynamic equilibria involving a phase transition such as distillation and liquid-liquid extraction. These techniques have a relatively low efficacy and nowadays they are not recommended because it is not sustainable in terms of energy consumption and/or waste generation. Pervaporation emerged in the 1980s and is now becoming a popular membrane separation technology because of its intrinsic features such as low energy requirements, cheap separation costs, and good quality product output. The focus of this review is on current developments in pervaporation, mass transport in membranes, material selection, fabrication and characterization techniques, and applications of various membranes in the separation of chemicals from water.
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Affiliation(s)
- Kadavil Subhash Lakshmy
- School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, Kerala, India; (K.S.L.); (D.L.); (A.N.); (A.B.); (H.D.); (N.G.); (S.T.)
| | - Devika Lal
- School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, Kerala, India; (K.S.L.); (D.L.); (A.N.); (A.B.); (H.D.); (N.G.); (S.T.)
| | - Anandu Nair
- School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, Kerala, India; (K.S.L.); (D.L.); (A.N.); (A.B.); (H.D.); (N.G.); (S.T.)
| | - Allan Babu
- School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, Kerala, India; (K.S.L.); (D.L.); (A.N.); (A.B.); (H.D.); (N.G.); (S.T.)
| | - Haritha Das
- School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, Kerala, India; (K.S.L.); (D.L.); (A.N.); (A.B.); (H.D.); (N.G.); (S.T.)
| | - Neethu Govind
- School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, Kerala, India; (K.S.L.); (D.L.); (A.N.); (A.B.); (H.D.); (N.G.); (S.T.)
| | - Mariia Dmitrenko
- St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia; (M.D.); (A.K.); (A.K.)
| | - Anna Kuzminova
- St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia; (M.D.); (A.K.); (A.K.)
| | - Aleksandra Korniak
- St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia; (M.D.); (A.K.); (A.K.)
| | - Anastasia Penkova
- St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia; (M.D.); (A.K.); (A.K.)
- Correspondence: (A.P.); (A.T.)
| | - Abhimanyu Tharayil
- School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, Kerala, India; (K.S.L.); (D.L.); (A.N.); (A.B.); (H.D.); (N.G.); (S.T.)
- Correspondence: (A.P.); (A.T.)
| | - Sabu Thomas
- School of Energy Materials, Mahatma Gandhi University, Kottayam 686560, Kerala, India; (K.S.L.); (D.L.); (A.N.); (A.B.); (H.D.); (N.G.); (S.T.)
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