Article
Polymer Science
Mahdy M. Elmahdy, Khalid A. Aldhafeeri, Moustafa T. Ahmed, Maged A. Azzam, Tarek Fahmy
Summary: The segmental dynamics and ion mobility of a polymer sample doped with an ionic liquid were investigated using dielectric spectroscopy and differential scanning calorimetry. The results showed that the addition of the ionic liquid reduced the glass transition temperature and increased the segmental relaxation rate of the material. There was also a coupling between the dynamics of the polymer chains and the ion transport.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Engineering, Electrical & Electronic
Mahdy M. Elmahdy, Moustafa T. Ahmed, Khalid A. Aldhafeeri, Maged A. Azzam, Tarek Fahmy
Summary: The casting method was used to prepare polymer films, and the properties of the polymer were changed by doping electrolyte. The presence of electrolyte altered the structure and thermal degradation behavior of the polymer, and improved the optical properties of the material.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Polymer Science
Chang-Tong Song, Xian-Hong Zhang, Dong Chen, Yu-Hong Ma, Wan-Tai Yang
Summary: Precipitation polymerization has advantages in both polymer synthesis and applications without surfactant or dispersing agent. Poly(vinyl chloride-co-n-butyl acrylate-co-vinyl acetate) (PCBV) random terpolymers were successfully synthesized in the precipitation polymerization system using vinyl chloride (VC), n-butyl acrylate (BA), and vinyl acetate (VAc). The effects of various polymerization conditions on the polymerization kinetics, number-average molecular weight (M-n), and terpolymer composition were investigated systematically. The solvent and monomer feed ratio played crucial roles in the polymer morphology and reaction kinetics. VC based ternary copolymer obtained in n-hexane showed lower M-n (<20 kDa) and higher BA units mass fraction (>40 wt%) compared with emulsion and suspension polymerization. The terpolymer can be easily separated by simple centrifugation.
CHINESE JOURNAL OF POLYMER SCIENCE
(2023)
Article
Physics, Condensed Matter
A. Y. Yassin, A. M. Abdelghany
Summary: A new nanocomposite material incorporating graphene oxide and EVOH copolymer was successfully synthesized, showing enhanced AC conductivity and potential for applications in energy storage devices such as electronic capacitors that require high dielectric constant and low dielectric loss materials. The research also revealed a change in conduction mechanism from non-overlapping small polaron tunneling to correlated barrier hopping in the nanocomposite.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Polymer Science
Changtong Song, Hongyi Shu, Xianhong Zhang, Yuhong Ma, Dong Chen, Wantai Yang
Summary: In this study, low molecular weight poly(vinyl chloride-co-n-butyl acrylate-co-vinyl acetate) (PCBV) ternary copolymers with varied copolymer composition were used as a novel polymeric lubricant in rigid PVC. The lubrication effect of PCBVs on the melting process and mechanical properties of the final PVC products was fully investigated. The results showed that PCBV can act as either an internal or an external lubricant depending on its composition. PCBV-45.5 terpolymer (PBA% similar to 45.5%) exhibited outstanding balance in both internal and external lubricating roles. SEM-EDS results revealed that the addition of PCBV-45.5 formed a film on the surface of PVC grains, similar to the addition of both internal and external lubricants. Fusion characteristics and DMTA demonstrated that PCBV-45.5 prolonged the fusion time and reduced the glass transition temperature. Finally, the mechanical properties of rigid PVC were greatly improved by using 1.5 phr PCBV-45.5, with increased tensile strength and elongation at break, as well as enhanced impact strength.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Polymer Science
Rajasmita Malik, Rajanikanta Parida, Bichitra Nanda Parida, Nimai C. Nayak
Summary: Light-weight and flexible 2D MXene-based polymer materials with different mass concentrations of Ti3C2Tx were fabricated and studied. The Ti3C2Tx was confirmed to be well distributed in the composites. Thermal stability of the composites increased with increasing Ti3C2Tx loading. The 10wt% Ti3C2Tx loaded polymer composite showed high dielectric constant and low dissipation loss at 100 Hz. The electrical behavior and conduction mechanisms of the composites were analyzed, suggesting their potential utilization in flexible electronic storage devices.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Chemical
Minhua Zhang, Yuankang Wang, Shuhan Liu, Yan Zhang, Yingzhe Yu
Summary: In this study, the vapor-liquid phase equilibrium data of vinyl acrylate-acetate and vinyl acrylate-vinyl acetate binary systems were calculated and fitted to simulate the separation process of vinyl acetate. The results provide a foundation for the development of the separation process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Automation & Control Systems
Samson Okikiola Oparanti, Abubakar Abubakar Khaleed, Abdelghaffar Amoka Abdelmalik
Summary: This study investigates the effect of Al2O3 and TiO2 nanoparticles dispersed in methyl ester to form nanofluids for oil-filled power equipment. The results show that Al2O3 nanofluid possesses superior dielectric properties and characteristic breakdown strength, making it a suitable replacement for mineral insulating oil.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
H. Elhosiny Ali, Mohd Shkir, Yasmin Khairy
Summary: Polymer blends incorporating different nanoparticles can provide new physical properties for various applications. In this study, poly (vinyl and pyrrolidone) blend films with varying contents of La@PbS nanoparticles were successfully prepared using a casting procedure. The structure of the films was characterized using XRD, TEM, AFM, and FTIR. UV-visible spectroscopy showed that the absorption edge shifted to a higher wavelength and the absorbance increased as the La@PbS content increased. The presence of direct optical bandgap transitions in the films was confirmed using Tauc's model and quantum theory.
Article
Materials Science, Multidisciplinary
Priyanka Rani, Kalim Deshmukh, Jaroslav Kadlec, T. V. Krishna Karthik, S. K. Khadheer
Summary: Novel nanocomposites based on PVA, CS, GQDs, and Fe2O3 were synthesized using a solution casting method. Structural modifications and morphological studies were conducted to confirm the presence of GQDs and Fe2O3 in the nanocomposites. Thermo-gravimetric analysis estimated the thermal stability of the nanocomposites, and dielectric properties were investigated. The results suggest that PVA/CS/GQDs/Fe2O3 nanocomposites have potential applications in energy storage.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Dipika Priyadarsini Jena, Shahid Anwar, R. K. Parida, B. N. Parida, Nimai C. Nayak
Summary: In this study, two-dimensional layered conductive materials (MXene) filled polymer composite structures were prepared using the solution casting technique, showing excellent dielectric properties with high electrical conductivity and low dielectric loss. Additionally, proper dispersion of the filler and synergetic interaction between the matrix and filler contribute to the high dielectric properties of the composite material.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Biochemistry & Molecular Biology
Slawomir Wilczewski, Katarzyna Skorczewska, Jolanta Tomaszewska, Krzysztof Lewandowski, Waldemar Studzinski, Magdalena Osial, Piotr Jenczyk, Hubert Grzywacz, Agata Domanska
Summary: In this study, a method to improve the dispersion of graphene in rigid poly(vinyl chloride) matrix using a plant extract from Curcuma longa L. is proposed. The use of the proposed extract as a dispersant resulted in improved dispersion, mechanical properties, thermal stability, and glass transition temperature of the nanocomposites. This suggests that the extract can be a promising eco-friendly additive for the production of nanocomposites with enhanced homogeneity.
Article
Polymer Science
Longbo Li, Yanika Schneider, Adrienne B. Hoeglund, Rebecca Braslau
Summary: In this study, internal plasticization of PVC was achieved in one-step by grafting different ratios of random n-butyl acrylate and 2-2-(2-ethoxyethoxy)ethyl acrylate copolymers from defect sites on the PVC chain using copper-mediated atom transfer radical polymerization. The resulting PVC graft copolymers exhibited good compatibility with PVC, improved plasticization efficiency, and enhanced thermal stability compared to unmodified PVC. Increasing the reaction scale could produce consistent and reproducible results, indicating potential industrial applicability.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Thermodynamics
Chong Li, Zhenpeng Zhang, Li He, Mingzhi Ye, Hongbo Ning, Yanlei Shang, Jinchun Shi, Sheng-Nian Luo
Summary: The ignition characteristics of methyl acrylate (MA) and vinyl acetate (VA) were investigated. The saturation and position of C=C double bond were found to affect the ignition process. Kinetic models for MA and VA were updated and constructed, respectively, to better reproduce the experimental results.
Article
Polymer Science
Jiajun Wei, Chunfa Ouyang, Xiaoqian Shan, Qun Gao, Kangsheng Zheng, Wei Luo
Summary: Two types of epoxy soybean oil (ESO) modified vinyl chloride acrylate copolymer emulsion (vc-m), physically modified vc-m-1 and chemically grafted vc-m-2, were successfully prepared. The modified emulsions exhibited improved flexibility and mechanical properties compared to vc-m, with vc-m-1 and vc-m-2 showing a reduction in glass transition temperature (T-g), an increase in tensile strength, and improved elongation at break. Additionally, vc-m-2 demonstrated better migration stability while maintaining identical mechanical properties and flexibility as vc-m-1. The modified emulsion has potential applications in coatings and road adhesives, especially in low ambient temperatures.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Ceramics
A. M. Abdelghany
Summary: Sodium metaphosphate glasses doped with WO3 were prepared under normal and oxidizing conditions. Optical, FTIR, and ESR spectral studies were conducted to investigate the photochromic behavior of the glasses. The spectral data revealed different absorption bands linked to iron and tungsten ions under various melting conditions.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
A. M. Abdelghany, A. M. Sarhan, E. Abdel-Latif, F. El-Dossoki
Summary: A novel CuO/ZnO/Al2O3 glass-ceramic was prepared via ordinary melt annealing route and characterized using various techniques. The synthesized catalyst was successfully applied for the Knoevenagel-type reaction under solvent-free conditions, leading to high yields of the product.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Materials Science, Multidisciplinary
A. A. Al-Shamari, A. M. Abdelghany, Hany Alnattar, A. H. Oraby
Summary: In this study, an eco-friendly and cost-effective route using water was employed for the synthesis of gold nanoparticles via laser ablation technique, and various characterization techniques were used to study the composite thin film structure formed by the gold nanoparticles and polymer matrix. The results showed that the addition of gold nanoparticles significantly affected the optical properties of the composite thin film.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
A. Y. Yassin, A. M. Abdelghany, M. M. Shaban, Y. M. Abdallah
Summary: In this study, a polymer blend filled with gold nanoparticles was synthesized and utilized as a corrosion inhibitor for carbon steel in a 5% sulfamic acid solution, showing up to 91.3% inhibition efficiency. The inhibition mechanism followed Langmuir adsorption isotherm, with quantum chemical computations proving the effectiveness of the nanocomposite. The experimental and computational results demonstrated a significant agreement, indicating the efficiency of the composite as a corrosion inhibitor.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Electrical & Electronic
A. M. Abdelghany, I. S. Elashmawi, A. A. Al-Shamari, Hany Alnattar
Summary: Gold nanoparticles (AuNPs) were synthesized using laser ablation technique and PEO/CMC-AuNPs nanocomposites were prepared using the casting method. Water was chosen as the solvent due to its eco-friendly nature. SEM micrographs showed uniformly distributed AuNPs on the sample surface. The increase in conductivity with the increase of AuNPs was attributed to an increase in transition probability for hopping electrons.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
A. Y. Yassin
Summary: Gold nanoparticles were synthesized using plant extract and laser ablation techniques. The nanoparticles were added to a blend to produce nanocomposites. Various analysis techniques confirmed the successful preparation of the nanoparticles and investigated the properties of the nanocomposites. The nanocomposites showed improved dielectric characteristics and have potential applications in optoelectronic devices such as sensors.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Amira M. Salem, A. Raouf Mohamed, A. M. Abdelghany, A. Y. Yassin
Summary: In this study, a hybrid polymer system based on sodium carboxymethyl cellulose and polypyrrole was created using solution casting. The interaction between CMC and PPy, as well as the morphological properties and thermal stability of the system, were studied. The dominance of amorphous regions and the addition of PPy were found to affect the optical properties and surface roughness of the synthesized films, making it suitable for opto-electronic applications.
Article
Materials Science, Ceramics
A. M. Abdelghany, E. G. Elbasuoni, G. M. El-Damrawi
Summary: Different glasses with varying compositions were studied for their bioactivity. Glasses with higher Nd2O3 content showed the formation of various crystalline structures when soaked in solution. The increased concentration of BO3 units with increasing Nd2O3 content played a key role in enhancing the bioactivity of the borate glasses.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
A. Y. Yassin, A. M. Abdelghany, Reda S. Salama, A. E. Tarabiah
Summary: Zinc oxide (ZnO) was synthesized using extracts from Thymus, Hibiscus rosa-sinensis, and Daucus carota. Three novel nanocomposites were formed by combining ZnO with sodium carboxymethyl cellulose (CMC) and polyvinyl alcohol (PVA). The (CMC/PVA)/ZnO nanocomposites exhibited semicrystalline nature as confirmed by X-ray diffraction (XRD). Fourier transform infrared spectroscopy (FTIR) identified the functional groups in the prepared samples. Transmission electron microscope (TEM) analysis revealed that the ZnO nanoparticles were mostly spherical with radii ranging from 10 to 40 nm. The nanocomposite PCZ-K showed the highest antibacterial activity against both E. coli (91.17%) and B. subtilis (94.28%). These nanocomposites are potential candidates for biological applications as they do not contain harmful chemicals.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
A. A. Al-Muntaser, Rami Adel Pashameah, Abdu Saeed, Reem Alwafi, Eman Alzahrani, Samah A. A. AlSubhi, A. Y. Yassin
Summary: Graphene nanoplatelet (GNP) and copper nanoparticles (Cu NPs) were successfully incorporated into polystyrene (PS) via a solution casting approach, resulting in a series of PS/GNP/Cu NPs nanocomposites. The structural, optical, and dielectric properties of the nanocomposites were studied in detail. The presence of GNP/Cu NPs hybrid nanofillers significantly enhanced the optical and dielectric properties of the nanocomposite films, as confirmed by XRD, TEM, and FT-IR analyses. The improved AC conductivity and dielectric characteristics make the PS/GNP/Cu NPs nanocomposite films highly suitable for flexible energy storage devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Chemical
E. M. Abdallah, G. M. Asnag, M. A. Morsi, Marwah Aljohani, Aisha Nawaf Albalwa, A. Y. Yassin
Summary: Polymer nanocomposite samples of a PVA/CMC blend doped with Cu and Se nanoparticles were prepared and characterized. The addition of Cu/Se nanoparticles increased the amorphous nature of the host polymer matrix. The nanocomposite exhibited a reduced optical energy gap and improved mechanical properties, as well as enhanced antibacterial activity.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Amira M. Salem, A. Raouf Mohamed, A. Y. Yassin
Summary: The aim of this study is to synthesize carboxymethyl cellulose/polypyrrole (CMC/PPy) blends with different PPy concentrations for low-cost and high-quality energy storage devices. The blends were studied for their structural and dielectric characteristics, with FT-IR spectroscopy used to analyze the structure and dielectric properties explored within the frequency range of 0.1 Hz-20 MHz. The results showed good homogeneity between the CMC matrix and PPy, improved thermal stability after incorporating PPy, and enhanced dielectric parameters and AC electrical conductivity with increasing PPy content.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Ceramics
Mohammed M. Damoom, Abdu Saeed, Eida M. Alshammari, Abdulsalam M. Alhawsawi, A. Y. Yassin, J. A. Mohammed Abdulwahed, A. A. Al-Muntaser
Summary: TiO2 nanoparticles were prepared and incorporated into a ternary blend polymer matrix to form polymer nanocomposite films. The addition of TiO2 NPs resulted in reduced crystallinity, increased refractive index, and decreased optical bandgap. The PNC films showed significantly improved electrical conductivity and dielectric constant, making them suitable for flexible-type energy storage applications.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
M. A. Aboelwafa, M. S. Meikhail, A. H. Oraby, A. M. Abdelghany
Summary: Soda-lime aluminosilicate glasses with different mole fractions of cerium oxide were synthesized via sol-gel route. The addition of cerium oxide played a crucial role in the glass network. The photoluminescence characteristics of both doped and undoped glasses were analyzed.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
A. M. Abdelghany, H. A. El-Batal, F. M. EzzEl-Din, N. ElAlialy, A. Okasha, D. Atta, A. M. Ismail, M. Abdelbaky, M. A. Aboelwafa, W. Awad
Summary: This study synthesized sodium borophosphate parent glass and derived samples containing different amounts of bismuth oxide. Fourier transform infrared spectroscopy was used to investigate the samples, and deconvolution analysis technique was employed to estimate the hidden or overlapped peaks. The study found that the IR spectra showed the presence of combined PO4 and BO3+BO4 groups upon adding Bi2O3.
RADIATION PHYSICS AND CHEMISTRY
(2024)