The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform
Nour F. Attia - One of the best experts on this subject based on the ideXlab platform.
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Novel synthesis of renewable and green flame-Retardant, antibacterial and reinforcement Material for styrene–butadiene rubber nanocomposites
Journal of Thermal Analysis and Calorimetry, 2020Co-Authors: Nour F. Attia, Basma K. SalehAbstract:Novel and facile method was developed for synthesis of cost-effective, green and smart flame-Retardant Material. Rice husk silica nanoparticles of an average size of 150 nm were prepared and coated with organic green molokhia extract. The developed nanoMaterial was used as effective flame-Retardant, reinforcement and antibacterial Material for styrene–butadiene rubber nanocomposite. The thermal stability of the developed nanocomposite was enhanced by 55 °C. The flame retardancy properties of the new nanocomposites was improved and achieved 31 and 33% reduction in peak heat release rate and average heat release rate, respectively, compared to blank sample. This is in conjunction with significant reduction in average effective heat of combustion (57%) with high fire safety rank. Additionally, significant suppression of emission of CO_2 and CO gases by 60% was achieved. The tensile strength of the smart nanocomposite was improved by 80% compared to blank rubber. The smart rubber nanocomposites achieved excellent inhibition for bacterial growth recorded 11.5 mm as inhibition zone compared to blank sample. This study opens new avenues for production of green, renewable and cost-effective reinforcement, flame-Retardant and antibacterial Material for various types of polymer and rubber nanocomposites for a variety of medical and industrial applications.
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Green synthesis of polymer nanofibers and their composites as flame‐Retardant Materials for polymer nanocomposites
Polymers for Advanced Technologies, 2016Co-Authors: Nour F. AttiaAbstract:Polyaniline nanofibers and their composites with carbon nanotubes were developed as an effective flame-Retardant Material using a facile green method. Polyaniline nanofibers were used as a smart flame-Retardant for acrylonitrile–butadiene–styrene polymer. The polyaniline nanofibers were dispersed in polymer matrix forming well-dispersed polymer nanocomposites. Effect of polyaniline nanofiber mass ratio on the polymer nanocomposite properties was studied. Polyaniline nanofiber composites with carbon nanotubes were also dispersed in polymer matrix. The thermal stability and flammability properties of the polymer nanocomposites were investigated. The rate of burning of polymer nanocomposites achieved 82.5% reduction (7.32 mm/min) compared with virgin polymer (42.5 mm/min). The reduction in peak heat release rate and total heat release of the polymer nanocomposites containing nanofibers achieved 74 and 34%, respectively. Interestingly, the average mass loss rate was significantly reduced by 58% and the emission of carbon monoxide and carbon dioxide gases were suppressed by 20 and 47%, respectively. The effect of polyaniline nanofibers composites on the flammability of polymer nanocomposites was also studied. Polyaniline nanofibers and their composites were characterized using Fourier transform infrared spectroscopy and transmission and scanning electron microscopy. The dispersion of polyaniline nanofibers in polymer nanocomposites was characterized using transmission electron microscopy. The different polymer nanocomposites were characterized using thermogravimetric analysis, UL94 flame chamber, and cone calorimeter tests. Copyright © 2016 John Wiley & Sons, Ltd.
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Flame‐Retardant Materials: synergistic effect of halloysite nanotubes on the flammability properties of acrylonitrile–butadiene–styrene composites
Polymer International, 2013Co-Authors: Nour F. Attia, M. A. Nour, M. A. Hassan, Kurt E. GeckelerAbstract:Novel well-dispersed nanocomposites of halloysite nanotubes and acrylonitrile–butadiene–styrene were prepared. The fire retardancy and thermal stability of these new nanocomposites were improved. A synergistic effect was observed between the halloysite nanotubes and an intumescent flame-Retardant system consisting of ammonium polyphosphate, melamine polyphosphate and pentaerythritol in the acrylonitrile–butadiene–styrene composites. The incorporation of the intumescent flame-Retardant Material into the halloysite–polymer nanocomposite system also improved the thermal stability and reduced the peak heat release rate by up to 56.2%, and it significantly reduced the emission of CO and CO2 gases. The morphology and dispersion of the halloysite nanotubes were characterized using scanning and transmission electron microscopy. The thermal stability and flammability properties were investigated using thermogravimetric analysis and cone calorimeter tests. © 2013 Society of Chemical Industry
You Da-ming - One of the best experts on this subject based on the ideXlab platform.
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special halogen free anti static flame Retardant Material for tpe thermal plastic elastomer molding and preparation method for special halogen free anti static flame Retardant Material
2015Co-Authors: Wang Pinyang, Meng Qifeng, You Da-mingAbstract:The invention discloses a special halogen-free anti-static flame-Retardant Material for TPE (thermal plastic elastomer) molding. The special halogen-free anti-static flame-Retardant Material comprises the following raw Materials: SEBS (styrene-ethylene-butadiene-styrene) rubber resin, a softening plasticizer, a flame Retardant, an anti-static agent, polypropylene resin, an antioxidant, a light stabilizer and a processing aid. The invention further discloses a preparation method for the special halogen-free anti-static flame-Retardant Material. The preparation method is simple in process step and easy to realize, and can be used for quickly preparing the special halogen-free anti-static flame-Retardant Material product for TPE molding. The special halogen-free anti-static flame-Retardant Material for TPE molding is reasonable in formula, has the advantages of no halogen, yellowing resistance, good flame resistance, good adhesion property, high fluidity, difficulty for dust adhesion, easiness for injection molding and the like, effectively avoids release of harmful substances in a heating process due to no halogen and flame resistance, cannot threaten human health or environment, and can be widely applied to an outer film of a high-grade headphone wire plug, an outer film of a data wire plug and other wire products.
Kurt E. Geckeler - One of the best experts on this subject based on the ideXlab platform.
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Flame‐Retardant Materials: synergistic effect of halloysite nanotubes on the flammability properties of acrylonitrile–butadiene–styrene composites
Polymer International, 2013Co-Authors: Nour F. Attia, M. A. Nour, M. A. Hassan, Kurt E. GeckelerAbstract:Novel well-dispersed nanocomposites of halloysite nanotubes and acrylonitrile–butadiene–styrene were prepared. The fire retardancy and thermal stability of these new nanocomposites were improved. A synergistic effect was observed between the halloysite nanotubes and an intumescent flame-Retardant system consisting of ammonium polyphosphate, melamine polyphosphate and pentaerythritol in the acrylonitrile–butadiene–styrene composites. The incorporation of the intumescent flame-Retardant Material into the halloysite–polymer nanocomposite system also improved the thermal stability and reduced the peak heat release rate by up to 56.2%, and it significantly reduced the emission of CO and CO2 gases. The morphology and dispersion of the halloysite nanotubes were characterized using scanning and transmission electron microscopy. The thermal stability and flammability properties were investigated using thermogravimetric analysis and cone calorimeter tests. © 2013 Society of Chemical Industry
Daniela Traini - One of the best experts on this subject based on the ideXlab platform.
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Microstructural Analysis of Porous Composite Materials: Dynamic Imaging of Drug Dissolution and Diffusion Through Porous Matrices
Aaps Journal, 2008Co-Authors: Paul M. Young, Kathy Nguyen, Allan S. Jones, Daniela TrainiAbstract:The dissolution and diffusion of molecules through porous Materials is of great interest to many researchers and can be found in diverse areas of science including catalyst manufacture, food and cosmetic production, tissue engineering, and a whole range of medicines. In terms of conventional medicines, tablets are by far the most popular formulations on the market and are preferred by patients and physicians alike. However, the science underpinning the design and function of more complex formulations, specifically those with controlled release profiles, is lacking in some respect. Due to their ease of manufacture and low costs, the simplest form of controlled release tablet is the matrix tablet (1–3). Matrix-based systems are usually obtained by direct compression of an active (drug) blended with Retardant Material and additives to form a simple matrix (3,4), in which the nature of the Retardant Material, which is usually a polymer, determines the nature of the matrix formed. If hydrophobic Materials such as wax and ethyl cellulose are used, they form porous matrices, which may be either inert or erodable (1,3). In theory, the Retardant Material in the inert matrix controls drug release by forming an inert diffusion barrier around the drug particles (4). Clearly, the liquid media must penetrate the matrix to allow the drug to be released from the matrix via diffusion and finally dissolution (3); thus, porosity is a key parameter (5,6). Production and manufacture variables encountered during the production of matrix-based Materials lead to variations in performance and therefore jeopardise regulatory acceptance. Subsequently, it would be advantageous to visualise the internal structure of such Materials post-manufacture and focus on the dynamic property of pore structure and porosity during dissolution and diffusion. X-ray microtomography (XCMT) can produce 3D images of Materials with a voxel size of around several micrometers cubed, allowing the visualisation of internal and microstructural details with different X-ray absorbencies. The intensity values associated with the different features of an XCMT image are determined by the X-ray transmission measured by an X-ray detection system, which is dependent on the Material’s atomic mass and the energy of X-rays (7,8). In a previous study, the investigators have focused on the use of XCMT for the study of modified release systems (Adalat® OROS, Alza Corporations OROS® technology, Alza, CA, USA). These formulations contain different excipients (swellable polyethylene oxide polymer), sodium chloride crystals, and nifedipine (active drug). All components were easily resolved by XCMT due to their inherent variations in density, giving evidence of the scope of applicability of the method (9). For this specific investigation, the goal was to evaluate XCMT as a nondestructive imaging technique, to study porous matrix structure and the diffusion and dissolution process that occurs during drug release. Inert matrix tablets (Ferrogradumet®, Abbott Laboratories, Australia) containing ferrous sulphate in a matrix of lactose and Eudragit® were chosen as the model tablets and evaluated using the XCMT at set time points during dissolution using a custom-built sample mount.
Basma K. Saleh - One of the best experts on this subject based on the ideXlab platform.
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Novel synthesis of renewable and green flame-Retardant, antibacterial and reinforcement Material for styrene–butadiene rubber nanocomposites
Journal of Thermal Analysis and Calorimetry, 2020Co-Authors: Nour F. Attia, Basma K. SalehAbstract:Novel and facile method was developed for synthesis of cost-effective, green and smart flame-Retardant Material. Rice husk silica nanoparticles of an average size of 150 nm were prepared and coated with organic green molokhia extract. The developed nanoMaterial was used as effective flame-Retardant, reinforcement and antibacterial Material for styrene–butadiene rubber nanocomposite. The thermal stability of the developed nanocomposite was enhanced by 55 °C. The flame retardancy properties of the new nanocomposites was improved and achieved 31 and 33% reduction in peak heat release rate and average heat release rate, respectively, compared to blank sample. This is in conjunction with significant reduction in average effective heat of combustion (57%) with high fire safety rank. Additionally, significant suppression of emission of CO_2 and CO gases by 60% was achieved. The tensile strength of the smart nanocomposite was improved by 80% compared to blank rubber. The smart rubber nanocomposites achieved excellent inhibition for bacterial growth recorded 11.5 mm as inhibition zone compared to blank sample. This study opens new avenues for production of green, renewable and cost-effective reinforcement, flame-Retardant and antibacterial Material for various types of polymer and rubber nanocomposites for a variety of medical and industrial applications.