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Basile S, Mathew E, Genta I, Conti B, Dorati R, Lamprou DA. Optimization of FDM 3D printing process parameters to produce haemodialysis curcumin-loaded vascular grafts. Drug Deliv Transl Res 2023; 13:2058-2071. [PMID: 34642844 PMCID: PMC10315350 DOI: 10.1007/s13346-021-01078-2] [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] [Accepted: 10/05/2021] [Indexed: 10/20/2022]
Abstract
3D printing has provided a new prospective in the manufacturing of personalized medical implants, including fistulas for haemodialysis (HD). In the current study, an optimized fused modelling deposition (FDM) 3D printing method has been validated, for the first time, to obtain cylindrical shaped fistulas. Printing parameters were evaluated for the manufacturing of fistulas using blank and 0.25% curcumin-loaded filaments that were produced by hot melt extrusion (HME). Four different fistula types have been designed and characterized using a variety of physicochemical characterization methods. Each design was printed three times to demonstrate printing process accuracy considering outer and inner diameter, wall thickness, width, and length. A thermoplastic polyurethane (TPU) biocompatible elastomer was chosen, showing good mechanical properties with a high elastic modulus and maximum elongation, as well as stability at high temperatures with less than 0.8% of degradation at the range between 25 and 250 °C. Curcumin release profile has been evaluated in a saline buffer, obtaining a low release (12%) and demonstrating drug could continue release for a longer period, and for as long as grafts should remain in patient body. Possibility to produce drug-loaded grafts using one-step method as well as 3D printing process and TPU filaments containing curcumin printability has been demonstrated.
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Affiliation(s)
- Sara Basile
- School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, UK
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Essyrose Mathew
- School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, UK
| | - Ida Genta
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Bice Conti
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Rossella Dorati
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy.
| | - Dimitrios A Lamprou
- School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, UK.
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2
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Schiessl S, Kucukpinar E, Rivollier N, Langowski HC, Eisner P. A Comparative Study on the Roll-to-Roll Processing of a Silicate-Polyvinyl Alcohol Composite Barrier Lacquer Using Slot-Die and Reverse Gravure Coating Techniques. Polymers (Basel) 2023; 15:2761. [PMID: 37447407 DOI: 10.3390/polym15132761] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/12/2023] [Accepted: 06/13/2023] [Indexed: 07/15/2023] Open
Abstract
The integration of platelet-shaped montmorillonite particles to improve the oxygen barrier of polyvinyl-alcohol-based barrier layers is state-of-the-art, but research on roll-to-roll coatings of such composite barrier lacquers has not been widely published. In this study, two different coating techniques, slot-die and reverse gravure, were used on a roll-to-roll scale to apply barrier lacquers comprising polyvinyl alcohol and montmorillonite. The lacquers were analyzed regarding viscosity at certain shear rates and surface energy and the dried coating layers regarding oxygen barrier, surface morphology, and particle orientation. Low permeability coefficients delivering a high oxygen barrier of 0.14 and 0.12 cm3 (STP) 1 μmm2 d bar were achieved for the coating layers with slot-die and reverse gravure coating, respectively. It turned out that the properties of the barrier lacquer need to be adjusted to the coating technique to achieve high oxygen barrier performance. By tailoring the barrier lacquer formulation, the orientation of the platelet-shaped montmorillonite particles can be achieved using both techniques. A low solid content of down to 3 wt% is preferable for the premetered slot-die coating, because it results in low agglomeration quantity in the coating layer. A high solid content of up to 9 wt% is preferable for the self-metered reverse gravure coating to assure a homogeneously coated layer.
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Affiliation(s)
- Stefan Schiessl
- TUM School of Life Sciences Weihenstephan, Technical University of Munich, Alte Akademie 8, 85354 Freising, Germany
- Fraunhofer Institute for Process Engineering and Packaging IVV, Materials Development Giggenhauser Strasse 35, 85354 Freising, Germany
| | - Esra Kucukpinar
- Fraunhofer Institute for Process Engineering and Packaging IVV, Materials Development Giggenhauser Strasse 35, 85354 Freising, Germany
| | - Noémie Rivollier
- Centre Technique Industriel de la Plasturgie (CT-IPC), 2 Rue Pierre et Marie Curie, 01100 Bellignat, France
- Institut für Geologische Wissenschaften, Freie Universität Berlin, Kaiserswerther Str. 16, 14195 Berlin, Germany
| | - Horst-Christian Langowski
- Fraunhofer Institute for Process Engineering and Packaging IVV, Materials Development Giggenhauser Strasse 35, 85354 Freising, Germany
| | - Peter Eisner
- TUM School of Life Sciences Weihenstephan, Technical University of Munich, Alte Akademie 8, 85354 Freising, Germany
- Fraunhofer Institute for Process Engineering and Packaging IVV, Materials Development Giggenhauser Strasse 35, 85354 Freising, Germany
- Steinbeis-Hochschule, System- und Bioverfahrenstechnik, Ernst-Augustin-Straße 15, 12489 Berlin, Germany
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3
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Olszewski A, Ławniczak A, Kosmela P, Strąkowski M, Mielewczyk-Gryń A, Hejna A, Piszczyk Ł. Influence of Surface-Modified Montmorillonite Clays on the Properties of Elastomeric Thin Layer Nanocomposites. MATERIALS (BASEL, SWITZERLAND) 2023; 16:1703. [PMID: 36837332 PMCID: PMC9964914 DOI: 10.3390/ma16041703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/03/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
In recent years, polyurethane nanocomposites have attracted more attention due to the massive demand for materials with increasingly exceptional mechanical, optical, electrical, and thermal properties. As nanofillers have a high surface area, the interaction between the nanofiller and the polymer matrix is an essential issue for these materials. The main aim of this study is to validate the impact of the montmorillonite nanofiller (MMT) surface structure on the properties of polyurethane thin-film nanocomposites. Despite the interest in polyurethane-montmorillonite clay nanocomposites, only a few studies have explored the impact of montmorillonite surface modification on polyurethane's material properties. For this reason, four types of polyurethane nanocomposites with up to 3% content of MMT were manufactured using the prepolymer method. The impact of montmorillonites on nanocomposites properties was tested by thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), contact angle measurement, X-ray diffraction (XRD), and optical coherence tomography (OCT). The results showed that chemical and physical interactions between the polymer matrix and functional groups on the montmorillonite surface have a considerable impact on the final properties of the materials. It was noticed that the addition of MMT changed the thermal decomposition process, increased T2% by at least 14 °C, changed the hydrophilicity of the materials, and increased the glass transition temperature. These findings have underlined the importance of montmorillonite surface structure and interactions between nanocomposite phases for the final properties of nanocomposites.
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Affiliation(s)
- Adam Olszewski
- Department of Polymer Technology, Chemical Faculty, Gdańsk University of Technology, G. Narutowicza St. 11/12, 80-233 Gdańsk, Poland
| | - Aleksandra Ławniczak
- Department of Polymer Technology, Chemical Faculty, Gdańsk University of Technology, G. Narutowicza St. 11/12, 80-233 Gdańsk, Poland
| | - Paulina Kosmela
- Department of Polymer Technology, Chemical Faculty, Gdańsk University of Technology, G. Narutowicza St. 11/12, 80-233 Gdańsk, Poland
| | - Marcin Strąkowski
- Department of Metrology and Optoelectronics, Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, G. Narutowicza St. 11/12, 80-233 Gdańsk, Poland
| | - Aleksandra Mielewczyk-Gryń
- Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, G. Narutowicza St. 11/12, 80-233 Gdańsk, Poland
| | - Aleksander Hejna
- Institute of Materials Technology, Poznan University of Technology, Piotrowo 3, 61-138 Poznań, Poland
| | - Łukasz Piszczyk
- Department of Polymer Technology, Chemical Faculty, Gdańsk University of Technology, G. Narutowicza St. 11/12, 80-233 Gdańsk, Poland
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Mahmoud A, Saied MA, Naser A, Fahmy A. Synthesis and Characterization of Nylon 6,6-Polyvinyl Alcohol-Based Polyelectrolytic Membrane. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-022-07537-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
AbstractThis work presents the preparation and investigation of blended nylon (N)/polyvinyl alcohol (PVA)-based polyelectrolytic membranes that are modified with different concentrations of sulfuric acid (SA), chlorosulfonic acid (CSA), and sulfonated activated carbon (SAC) as a filler. Scanning electron microscopy (SEM) micrographs illustrated good membrane homogeneity, and no cracks or phase separation were detected. Chemical interaction between N, PVA, and other membrane components was confirmed by Raman scattering spectroscopy and Fourier transform infrared (FTIR). In addition, the molecular structure is verified by energy depressive X-ray (EDX). Furthermore, water and methanol uptake, gel fraction, and IEC were determined as functions of varied membrane modification components. The results revealed that increasing the portion of SA, CSA and SAC led to an increase in IEC and ionic conductivity values reached 2.12 meq/g–0.076 S/cm for (N/PVA-4.0% SA-4.0% SAC), respectively, and 2.71 meq/g–0.087 S/cm for (N/PVA-4.0% CSA-4.0% SAC), respectively, while the IEC and ionic conductivity value for non-modified N/PVA membrane was 0.02 meq/g and zero, respectively. Such results enhance the potential feasibility of modified N/PVA electrolytic membranes for fuel cell (FC) applications.
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Improving flame retardant and smoke suppression efficiency for PBS by adding a tannin surface and interfacial modified IFR/MMT synergist. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Albozahid M, Naji HZ, Alobad ZK, Wychowaniec JK, Saiani A. Synthesis and characterization of hard copolymer polyurethane/functionalized graphene nanocomposites: Investigation of morphology, thermal stability, and rheological properties. J Appl Polym Sci 2022. [DOI: 10.1002/app.53118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Muayad Albozahid
- Department of Materials Engineering, Faculty of Engineering University of Kufa Najaf Iraq
| | - Haneen Zuhair Naji
- Department of Chemical Engineering, Faculty of Engineering University of Babylon Hilla Iraq
| | - Zoalfokkar Kareem Alobad
- Department of Polymers Engineering and Petrochemical Industries, Faculty of Materials Engineering University of Babylon Hilla Iraq
| | - Jacek K. Wychowaniec
- School of Natural Sciences, Department of Materials University of Manchester Manchester UK
- Marie Curie Research Fellow AO Research Institute Davos Davos Switzerland
| | - Alberto Saiani
- School of Natural Sciences, Department of Materials University of Manchester Manchester UK
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Ahmad MN, Nadeem S, Javed M, Iqbal S, Hassan SU, Aljazzar SO, Elkaeed EB, Pashameah RA, Alzahrani E, Farouk AE, Alotaibi MT, Abd-Rabboh HSM. Improving the Thermal Behavior and Flame-Retardant Properties of Poly(o-anisidine)/MMT Nanocomposites Incorporated with Poly(o-anisidine) and Clay Nanofiller. Molecules 2022; 27:molecules27175477. [PMID: 36080245 PMCID: PMC9457598 DOI: 10.3390/molecules27175477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/18/2022] [Accepted: 08/22/2022] [Indexed: 11/19/2022] Open
Abstract
The synthesis of MMT and poly(o-anisidine) (MMT/POA) clay nanocomposites was carried out by using the chemical oxidative polymerization of POA and MMT clay with POA, respectively. By maintaining the constant concentration of POA, different percentage loads of MMT clay were used to determine the effect of MMT clay on the properties of POA. The interaction between POA and MMT clay was investigated by FTIR spectroscopy, and, to reveal the complete compactness and homogeneous distribution of MMT clay in POA, were assessed by using scanning-electron-microscope (SEM) analysis. The UV–visible spectrum was studied for the optical and absorbance properties of MMT/POA ceramic nanocomposites. Furthermore, the horizontal burning test (HBT) demonstrated that clay nanofillers inhibit POA combustion.
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Affiliation(s)
- Mirza Nadeem Ahmad
- Department of Applied Chemistry, Government College University Faisalabad, Faisalabad 38000, Pakistan
| | - Sohail Nadeem
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
- Correspondence: (S.N.); (S.I.)
| | - Mohsin Javed
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
| | - Shahid Iqbal
- Department of Chemistry, School of Natural Sciences (SNS), National University of Science and Technology (NUST), H-12, Islamabad 46000, Pakistan
- Correspondence: (S.N.); (S.I.)
| | - Sadaf ul Hassan
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
| | - Samar O. Aljazzar
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Eslam B. Elkaeed
- Department of Pharmaceutical Sciences, College of Pharmacy, AlMaarefa University, Riyadh 13713, Saudi Arabia
| | - Rami Adel Pashameah
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah 24230, Saudi Arabia
| | - Eman Alzahrani
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Abd-ElAziem Farouk
- Department of Biotechnology College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Mohammed T. Alotaibi
- Department of Chemistry, Turabah University College, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Hisham S. M. Abd-Rabboh
- Chemistry Department, Faculty of Science, King Khalid University, P. O Box 9004, Abha 61413, Saudi Arabia
- Department of Chemistry, Faculty of Science, Ain Shams University, Abbassia, Cairo 11566, Egypt
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8
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Huang X, Ge M, Wang H, Liang H, Meng N, Zhou N. Functional modification of polydimethylsiloxane nanocomposite with silver nanoparticles-based montmorillonite for antibacterial applications. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128666] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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9
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Zhou N, Yang S, Liu Y, Tuo X, Gong Y, Guo J. Performance evaluation on particle‐reinforced rigid/flexible composites via fused deposition modeling
3D
printing. J Appl Polym Sci 2022. [DOI: 10.1002/app.52149] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ning Zhou
- School of Textile and Material Engineering Dalian Polytechnic University Dalian Liaoning China
| | - Shuochen Yang
- School of Textile and Material Engineering Dalian Polytechnic University Dalian Liaoning China
| | - Yanyue Liu
- School of Textile and Material Engineering Dalian Polytechnic University Dalian Liaoning China
| | - Xiaohang Tuo
- School of Textile and Material Engineering Dalian Polytechnic University Dalian Liaoning China
| | - Yumei Gong
- School of Textile and Material Engineering Dalian Polytechnic University Dalian Liaoning China
| | - Jing Guo
- School of Textile and Material Engineering Dalian Polytechnic University Dalian Liaoning China
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Allami T, Alamiery A, Nassir MH, Kadhum AH. Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications. Polymers (Basel) 2021; 13:2467. [PMID: 34372071 PMCID: PMC8347130 DOI: 10.3390/polym13152467] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/21/2021] [Accepted: 03/22/2021] [Indexed: 12/03/2022] Open
Abstract
The effect of the soft and hard polyurethane (PU) segments caused by the hydrogen link in phase-separation kinetics was studied to investigate the morphological annealing of PU and thermoplastic polyurethane (TPU). The significance of the segmented PUs is to achieve enough stability for further applications in biomedical and environmental fields. In addition, other research focuses on widening the plastic features and adjusting the PU-polyimide ratio to create elastomer of the poly(urethane-imide). Regarding TPU- and PU-nanocomposite, numerous studies investigated the incorporation of inorganic nanofillers such as carbon or clay to incorporating TPU-nanocomposite in several applications. Additionally, the complete exfoliation was observed up to 5% and 3% of TPU-clay modified with 12 amino lauric acid and benzidine, respectively. PU-nanocomposite of 5 wt.% Cloisite®30B showed an increase in modulus and tensile strength by 110% and 160%, respectively. However, the nanocomposite PU-0.5 wt.% Carbone Nanotubes (CNTs) show an increase in the tensile modulus by 30% to 90% for blown and flat films, respectively. Coating PU influences stress-strain behavior because of the interaction between the soft segment and physical crosslinkers. The thermophysical properties of the TPU matrix have shown two glass transition temperatures (Tg's) corresponding to the soft and the hard segment. Adding a small amount of tethered clay shifts Tg for both segments by 44 °C and 13 °C, respectively, while adding clay from 1 to 5 wt.% results in increasing the thermal stability of TPU composite from 12 to 34 °C, respectively. The differential scanning calorimetry (DSC) was used to investigate the phase structure of PU dispersion, showing an increase in thermal stability, solubility, and flexibility. Regarding the electrical properties, the maximum piezoresistivity (10 S/m) of 7.4 wt.% MWCNT was enhanced by 92.92%. The chemical structure of the PU-CNT composite has shown a degree of agglomeration under disruption of the sp2 carbon structure. However, with extended graphene loading to 5.7 wt.%, piezoresistivity could hit 10-1 S/m, less than 100 times that of PU. In addition to electrical properties, the acoustic behavior of MWCNT (0.35 wt.%)/SiO2 (0.2 wt.%)/PU has shown sound absorption of 80 dB compared to the PU foam sample. Other nanofillers, such as SiO2, TiO2, ZnO, Al2O3, were studied showing an improvement in the thermal stability of the polymer and enhancing scratch and abrasion resistance.
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Affiliation(s)
- Tyser Allami
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor Darul Ehsan, Malaysia; (A.A.); (M.H.N.); (A.H.K.)
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11
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He H, Jia RJ, Dong KQ, Huang JW, Qin ZY. Ultrasonic-modified montmorillonite uniting ethylene glycol diglycidyl ether to reinforce protein-based composite films. E-POLYMERS 2021. [DOI: 10.1515/epoly-2021-0044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Abstract
A novel biodegradable protein-based material (UMSPIE) that consists of natural polymer soy protein isolate (SPI), ultrasonic-modified montmorillonite (UMMT), and ethylene glycol diglycidyl ether (EGDE) was produced by solution casting. Fourier infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TG), and scanning electron microscopy (SEM) were used to characterize the chemical structure and micro-morphologies of as-synthesized protein-based composite films. The results showed that the interlayer structure of MMT was destroyed by ultrasonic treatment, and the hydrogen bonding between SPI chains and the ultrasound-treated MMT plates was enhanced. The synergistic effect of UMMT and EGDE on SPI molecules made the network structure of the UMSPIE film denser. In addition, the mechanical and barrier properties of the as-synthesized films were explored. Compared with pure soy protein film, the tensile strength of the UMSPIE film has an increase of 266.82% (increasing from 4.4 to 16.14 MPa). From the above, the modified strategy of layered silicates filling combining crosslinking agents is considered as an effective method to improve the functional properties of bio-based polymer composites.
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Affiliation(s)
- Hua He
- School of Resources, Envirnoment and Materials, Guangxi University , Nanning 530000 , China
- MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi University , Nanning 530000 , China
| | - Rui-jing Jia
- School of Resources, Envirnoment and Materials, Guangxi University , Nanning 530000 , China
- MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi University , Nanning 530000 , China
| | - Kai-qiang Dong
- School of Resources, Envirnoment and Materials, Guangxi University , Nanning 530000 , China
- MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi University , Nanning 530000 , China
| | - Jia-wen Huang
- College of Materials Science and Technology, Beijing Forestry University , Beijing 100083 , China
| | - Zhi-yong Qin
- School of Resources, Envirnoment and Materials, Guangxi University , Nanning 530000 , China
- MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi University , Nanning 530000 , China
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Karunarathna B, Jayakody RS, Karunanayake L, Govender KK. Computational development and validation of a representative MDI-BDO-based polyurethane hard segment model. J Mol Model 2021; 27:37. [PMID: 33432382 DOI: 10.1007/s00894-020-04660-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 12/16/2020] [Indexed: 10/22/2022]
Abstract
Segmented polyurethanes show extraordinary physicochemical properties, mainly owing to the nature and the chemistry of the hard segment domains. There are yet many inexplicable physiochemical properties of MDI-BDO-based hard polyurethane segments such as the geometry, cis-trans isomerism, electronic structure, chemical reactivity, the inter-hard-segment interactions, and the photo-response. In the present study, it was attempted to develop and validate a model system that would facilitate further research on the structural and chemical properties of the MDI-BDO hard segments. It was found that the trans isomer of urethane bond is more stable than the cis isomer, and it is argued here that thermal transformation from trans to cis not possible due to the high rotational energy barrier. The differences between the calculated IR spectra of the cis and trans isomers are proposed as a powerful differentiation tool. The calculated Fukui indices show that cis and trans isomers are different in their chemical reactivity. The findings of the present study suggest intermolecular and intramolecular pi-stacking and highly plausible two significant types of hydrogen bond types between hard segments. In the present study, a model system for MDI-BDO hard segment was developed and successfully validated via computational experiments. Further calculations done with the new model provided an indispensable understanding of the structure, cis-trans isomerism, reactivity, and intermolecular interactions of the MDI-BDO hard segments. The proposed model can be further improved in the future by incorporating suitable soft segments. In summary, the model system developed and validated in the present study has provided new opportunities to understand and further study the structural and chemical features of the hard segments of the MDI-BDO-based polyurethane.
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Affiliation(s)
- Baggya Karunarathna
- Centre for Scientific Computing and Advanced Drug Discovery, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka
| | - Ranga Srinath Jayakody
- Centre for Scientific Computing and Advanced Drug Discovery, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka. .,Department of Chemistry, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka.
| | - Laleen Karunanayake
- Department of Polymer Science, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka
| | - Krishna Kuben Govender
- Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein Campus, Johannesburg, 2028, South Africa.,Council for Scientific and Industrial Research, National Integrated Cyber Infrastructure, Centre for High Performance Computing, 15 Lower Hope Road, Rosebank, Cape Town, 7700, South Africa
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13
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Hydrogen bonding and topological network effects on optimizing thermoplastic polyurethane/organic montmorillonite nanocomposite foam. POLYMER 2021. [DOI: 10.1016/j.polymer.2020.123159] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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14
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Yu L, Liu Y, Feng P, Shuai C, Peng S, Min A. Organically modified montmorillonite improves interfacial compatibility between PLLA and PGA in bone scaffold. Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2020.109394] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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15
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Preparation and characterization of thermosensitive chitosan/carboxymethylcellulose/scleroglucan nanocomposite hydrogels. Int J Biol Macromol 2020; 162:781-797. [DOI: 10.1016/j.ijbiomac.2020.06.087] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 06/10/2020] [Accepted: 06/10/2020] [Indexed: 02/07/2023]
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16
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Ma Y, Shen Y, Liu Z, Shi Z, Yin J, Tian M, Qu R. Exploring multiple functions of diarylsemipinacol linked to the saturated ethylene–propylene elastomer: from the dynamic covalent networks to tailoring its macroscopic performance. Polym Chem 2019. [DOI: 10.1039/c9py01354g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Through the multiple functions of diarylsemipinacol, we prepared a mechanically robust and healable EPM with shape memory properties, by integrating self-associating ureidopyrimidinone (UPy) into the dynamic covalent networks.
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Affiliation(s)
- Youwei Ma
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal Matrix Composite Materials and Shanghai Key Lab of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Yufei Shen
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal Matrix Composite Materials and Shanghai Key Lab of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Zhiyong Liu
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal Matrix Composite Materials and Shanghai Key Lab of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Zixing Shi
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal Matrix Composite Materials and Shanghai Key Lab of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Jie Yin
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal Matrix Composite Materials and Shanghai Key Lab of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai
- China
| | - Ming Tian
- State Key Lab of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- Beijing
- China
| | - Rongjun Qu
- School of Chemistry and Materials Science
- Ludong University
- Yantai 264025
- China
| |
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