The Experts below are selected from a list of 999 Experts worldwide ranked by ideXlab platform
Mehdi Jonoobi - One of the best experts on this subject based on the ideXlab platform.
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effect of Polybutylene Terephthalate pbt on impact property improvement of hybrid kenaf glass epoxy composite
Materials Letters, 2012Co-Authors: M M Davoodi, S M Sapuan, Desa Ahmad, A Aidy, A Khalina, Mehdi JonoobiAbstract:Environmental regulations, costs and lightweight encourage car manufacturers to develop new reliable products. Epoxy provides a reliable fibre impregnation and creates substantial three-dimensional (3D) cross-linking for proper load transmission and impact strength improvement, but their low toughness decreases their energy absorption. Thermoplastic toughening improves the epoxy impact property with a low thermo-mechanical defect. This study, focused on improving the impact property of hybrid kenaf/glass fibre epoxy composite by use of a modified sheet moulding compound (GMT). The results indicated that most of the mechanical properties of developed material were almost the same as those of the GMT, except impact. This result highlights the potential for utilisation of the toughened hybrid bio-composite in some automotive structural components. Moreover, geometric parameters, e.g., cross-section, thickness, and reinforcement ribs suggest an improvement of structural impact resistance to comply with the bumper beam product design specification (PDS).
Nathalie De Geyter - One of the best experts on this subject based on the ideXlab platform.
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fabrication of peot pbt nanofibers by atmospheric pressure plasma jet treatment of electrospinning solutions for tissue engineering
Macromolecular Bioscience, 2018Co-Authors: Silvia Grande, Pieter Cools, Mahtab Asadian, Joachim F R Van Guyse, Iuliia Onyshchenko, Heidi Declercq, Rino Morent, Richard Hoogenboom, Nathalie De GeyterAbstract:This study focuses on the enhanced electrospinning of 300-Polyethylene oxide-polyethylene oxide Terephthalate/Polybutylene Terephthalate (PEOT/PBT). An atmospheric pressure plasma jet for liquid treatment is applied to a solution with 9 w/v% PEOT/PBT dissolved in either chloroform (CHCl3), CHCl3 + N,N-dimethylformamide (DMF), CHCl3 + methanol (MeOH), or CHCl3 + hexafluoroisopropanol (HFIP). For all conditions, the plasma-treated samples present better-quality fibers: less or no-beads and uniform fiber diameter distribution. Except for CHCl3 + DMF, no significant changes to the material bulk are detected, as shown with size exclusion chromatography (SEC). X-ray photoelectron spectroscopy (XPS) spectra performed on nanofibers record an increase in C-C bonds for the CHCl3 + DMF combination upon plasma modification, while a shift and slight increase in oxygen-containing bonds is found for the CHCl3 + HFIP and CHCl3 + MeOH mixtures. MTT assay shows no-cytotoxic effects for CHCl3 + DMF, while a better cellular adhesion is found on nanofibers from CHCl3 + MeOH and CHCl3 + HFIP. Among the examined additives, MeOH is preferable as it produces beadless electrospun nanofibers with an average diameter of 290 +/- 100 nm without causing significant changes to the final nanofiber surface properties.
M M Davoodi - One of the best experts on this subject based on the ideXlab platform.
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effect of Polybutylene Terephthalate pbt on impact property improvement of hybrid kenaf glass epoxy composite
Materials Letters, 2012Co-Authors: M M Davoodi, S M Sapuan, Desa Ahmad, A Aidy, A Khalina, Mehdi JonoobiAbstract:Environmental regulations, costs and lightweight encourage car manufacturers to develop new reliable products. Epoxy provides a reliable fibre impregnation and creates substantial three-dimensional (3D) cross-linking for proper load transmission and impact strength improvement, but their low toughness decreases their energy absorption. Thermoplastic toughening improves the epoxy impact property with a low thermo-mechanical defect. This study, focused on improving the impact property of hybrid kenaf/glass fibre epoxy composite by use of a modified sheet moulding compound (GMT). The results indicated that most of the mechanical properties of developed material were almost the same as those of the GMT, except impact. This result highlights the potential for utilisation of the toughened hybrid bio-composite in some automotive structural components. Moreover, geometric parameters, e.g., cross-section, thickness, and reinforcement ribs suggest an improvement of structural impact resistance to comply with the bumper beam product design specification (PDS).
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Effect of Polybutylene Terephthalate (PBT) on impact property improvement of hybrid kenaf/glass epoxy composite.
'Elsevier BV', 2012Co-Authors: S M Sapuan, M M Davoodi, A Aidy, A Khalina, Ahmad Desa, Jonoobi MehdiAbstract:Environmental regulations, costs and lightweight encourage car manufacturers to develop new reliable products. Epoxy provides a reliable fibre impregnation and creates substantial three-dimensional (3D) cross-linking for proper load transmission and impact strength improvement, but their low toughness decreases their energy absorption. Thermoplastic toughening improves the epoxy impact property with a low thermo-mechanical defect. This study, focused on improving the impact property of hybrid kenaf/glass fibre epoxy composite by use of a modified sheet moulding compound (GMT). The results indicated that most of the mechanical properties of developed material were almost the same as those of the GMT, except impact. This result highlights the potential for utilisation of the toughened hybrid bio-composite in some automotive structural components. Moreover, geometric parameters, e.g., cross-section, thickness, and reinforcement ribs suggest an improvement of structural impact resistance to comply with the bumper beam product design specification (PDS)
Horst Friedrich - One of the best experts on this subject based on the ideXlab platform.
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3D printing of CNT- and graphene-based conductive polymer nanocomposites by fused deposition modeling
Applied Materials Today, 2017Co-Authors: K. Gnanasekaran, T. Heijmans, S. Van Bennekom, H. Woldhuis, S. Wijnia, G. De With, Horst FriedrichAbstract:Fused deposition modeling (FDM) is limited by the availability of application specific functional materials. Here we illustrate printing of non-conventional polymer nanocomposites (CNT- and graphene-based Polybutylene Terephthalate (PBT)) on a commercially available desktop 3D printer leading toward printing of electrically conductive structures. The printability, electrical conductivity and mechanical stability of the polymer nanocomposites before and after 3D printing was evaluated. The results show that 3D printed PBT/CNT objects have better conductive and mechanical properties and a better performance than 3D printed PBT/graphene structures. In addition to that, printing more than one material (multi-materials) and challenges in using abrasive conductive fillers (i.e., CNT and graphene) are also discussed. Overall this study demonstrates that a commercially available desktop 3D printer can be used to fabricate low-cost functional objects.
Alberto Fina - One of the best experts on this subject based on the ideXlab platform.
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effect of processing conditions on the thermal and electrical conductivity of poly butylene Terephthalate nanocomposites prepared via ring opening polymerization
Materials & Design, 2017Co-Authors: Samuele Colonna, Mar M Bernal, Gentian Gavoci, Julio Gomez, Chiara Novara, Guido Saracco, Alberto FinaAbstract:Abstract Successful preparation of polymer nanocomposites, exploiting graphene-related materials, via melt mixing technology requires precise design, optimization and control of processing. In the present work, the effect of different processing parameters during the preparation of poly (butylene Terephthalate) nanocomposites, through ring-opening polymerization of cyclic butylene Terephthalate in presence of graphite nanoplatelets (GNP), was thoroughly addressed. Processing temperature (240 °C or 260 °C), extrusion time (5 or 10 min) and shear rate (50 or 100 rpm) were varied by means of a full factorial design of experiment approach, leading to the preparation of Polybutylene Terephthalate/GNP nanocomposite in 8 different processing conditions. Morphology and quality of GNP were investigated by means of electron microscopy, X-ray photoelectron spectroscopy, thermogravimetry and Raman spectroscopy. Molecular weight of the polymer matrix in nanocomposites and nanoflake dispersion were experimentally determined as a function of the different processing conditions. The effect of transformation parameters on electrical and thermal properties was studied by means of electrical and thermal conductivity measurement. Heat and charge transport performance evidenced a clear correlation with the dispersion and fragmentation of the GNP nanoflakes; in particular, gentle processing conditions (low shear rate, short mixing time) turned out to be the most favourable condition to obtain high conductivity values.