Article
Polymer Science
Gulsum Ceylan, Serkan Emik, Tuncer Yalcinyuva, Emin Sunbuloglu, Ergun Bozdag, Fatma Unalan
Summary: This study investigated the effects of different cross-linking agents with varying chain lengths and flexibilities on the mechanical properties of PMMA. The results showed that there was no significant increase in flexural strength, elastic modulus, or impact strength with the addition of cross-linking agents. However, the surface hardness of PMMA notably decreased with the addition of PEGDMA in concentrations ranging from 5% to 20%. The incorporation of cross-linking agents in concentrations ranging from 5% to 15% led to an improvement in the mechanical properties of PMMA.
Article
Chemistry, Physical
ShiWei Xie, Dong Wang, Sa Zhang, JianHua Xu, JiaJun Fu
Summary: This article describes a catalyst-free and efficient method for preparing high performance PMMA through hindered urea bond (HUB) crosslinking strategies. The HUB crosslinked PMMA exhibits improved mechanical properties, including increased Young's modulus, tensile strength, strain at break, and toughness. It also shows excellent solvent resistance, high temperature creep resistance, and the ability to be recycled and repaired.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Polymer Science
Trevor Gilbert, Matthew A. Campea, Nahieli Preciado Rivera, Michael Majcher, Richard Alsop, Mouhanad Babi, Thomas Kalab, Jose Moran-Mirabal, Maikel Rheinstadter, Todd Hoare
Summary: In this study, injectable PNIPAM/PVP interpenetrating polymer networks were fabricated and characterized. The results show that the internal structure of the injectable IPNs can be controlled by adjusting the PVP molecular weight and degree of thiolation. The PNIPAM gelation drives the formation of domains, with PNIPAM mainly located in the PVP-rich domains and PVP entrapped in the PNIPAM-rich domain. Additionally, the structural reconfiguration of the IPNs can be achieved by heating above the volume phase transition temperature of the PNIPAM phase, which is influenced by the molecular weight and thiolation degree of the PVP precursor polymers.
Article
Polymer Science
Jun Zhong, Xinyue Zhang, Xiaofeng Yu, Xuanyu Shi, Shihao Sun, Li Yang, Min Zuo, Yihu Song, Qiang Zheng
Summary: The selective distribution of silica nanoparticles grafted with crosslinked PMMA in PMMA/SAN blend was studied. Highly crosslinked PMMA chains mainly located in the PMMA-rich domains, while linear PMMA chains mainly located at the blend matrix interface. NPs grafted with slightly crosslinked chains were partially located at the interface and partially in the PMMA-rich domains. The deviation between theoretical prediction and actual location of modified NPs may be related to the heterogeneity of miniemulsion polymerization. The different locations of modified NPs induced by different grafted chain structures can result in various compatibilization effects on PMMA/SAN blend.
Article
Polymer Science
Soheil Sharifi, Isabel Asenjo-Sanz, Jose A. Pomposo, Angel Alegria
Summary: The molecular dynamics of a copolymer composed of methyl methacrylate (MMA) and (2-acetoacetoxy)ethyl methacrylate (AEMA) monomers and the influence of intra-to intermolecular cross-links of AEMA units with ethylenediamine (EDA) were studied. The results showed that cross-linking had a significant impact on the copolymer's dynamic processes, glass transition temperature Tg, and dynamic heterogeneity, while having minimal effect on the secondary relaxation process.
Article
Materials Science, Multidisciplinary
Alireza Farazin, Alireza Shakeri, Hossein Mahdavi
Summary: In this study, an amphiphilic block copolymer suitable for modification of forward osmosis (FO) membrane support layers was synthesized using the ATRP method. The addition of this copolymer significantly improved the performance of the support layer, and the best performing membrane exhibited satisfactory FO performance.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Naharullah Jamaluddin, Yu- Hsu, Taka-Aki Asoh, Hiroshi Uyama
Summary: In this study, nanocomposites of PMMA and CNFp were successfully prepared using a solution casting technique. The experimental results showed that CNFp exhibited good compatibility and uniform dispersion in the PMMA matrix, indicating great potential for various applications.
Article
Polymer Science
Shaymaa Sansul, Emad Yousif, Dina S. Ahmed, Gamal A. El-Hiti, Benson M. Kariuki, Hassan Hashim, Ahmed Ahmed
Summary: The modification of polymeric materials is crucial for enhancing their resistance to aging and UV radiation. This study investigated the effect of pendant functionalization of PMMA with organometallic moieties on photostability. The modified PMMA showed reduced photodecomposition compared to unmodified PMMA, and the presence of metals significantly decreased the photodegradation of the polymer. Among the metal complexes examined, the PMMA containing the Schiff base-cobalt unit exhibited the least damage from photoirradiation, followed by those containing nickel, zinc, and copper.
Article
Polymer Science
Yusuke Mizuta, Hiromu Okada, Chao Zhao, Ryuichi Sugimoto, Nagatoshi Nishiwaki, Kazuya Kobiro
Summary: In this study, the surface of a poly(ethylene-co-tetrafluoroethylene) (ETFE) film was modified by grafting methyl methacrylate (MMA), resulting in increased hydrophilicity. The grafting yield of MMA was found to be affected by reaction conditions, temperature, and initiator concentration. The results provide evidence of successful PMMA grafting onto the ETFE film surface, altering its surface properties.
Article
Engineering, Electrical & Electronic
S. El-Sayed, Adel M. El Sayed
Summary: Composites of transition metal oxides (TMOs)/polymers have many applications in modern technology, industry, and biology. In this study, Co3O4 and CuO nanoparticles were synthesized and doped into PMMA, resulting in nanocomposites with improved optical properties and low dielectric loss. CuO was found to be more effective than Co3O4 in enhancing the optical parameters of the nanocomposites.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Polymer Science
Hyeyoung Park, Martin Wiesing, Philipp Zimmermann, Andreas Janke, Simona Schwarz, Jurgen Nagel
Summary: This article investigates a new approach for functionalizing a surface by using a conventional laser to generate chemical activation. By optimizing laser parameters, poly(ethyleneimine) (PEI) was successfully grafted onto poly(methyl methacrylate) (PMMA) and the modified surface was characterized and analyzed.
Article
Polymer Science
Hamza Mahmoud Aboelanin, Stepan Podzimek, Vladimir Spacek
Summary: This study focuses on the detailed characterization of the molecular structure and dilute solution properties of highly dense star-like polymers of poly(methyl methacrylate) and poly(n-butyl methacrylate). The comparison of refractive index increment with corresponding linear homopolymers was conducted. The prepared polymers were characterized using size exclusion chromatography, multi-angle light scattering detector, and online viscometer. The obtained data allowed for the determination of arm distribution, average number of arms per molecule, and molar mass dependency of the draining factor. The relation between the number of arms per molecule and molar mass was estimated and compared with true values.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Saori Nara, Hiroki Sagawa, Hiromu Saito, Hideko T. Oyama
Summary: In this study, super-tough PPS-based blends were achieved by melt blending PPS with EGMA and PPSU, showcasing the significant synergistic effects of interfacial reaction between PPS and EGMA and partial miscibility between PPS and PPSU on toughening mechanisms.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Xinyue Zhang, Haimo Zhang, Min Zuo, Jun Zhong, Xuanyu Shi, Shihao Sun, Li Yang, Yihu Song, Qiang Zheng
Summary: The effect of selective distribution and migration behavior of two types of modified nanoclays on the phase behavior of PMMA/SAN blends is investigated. The different grafting density and chain lengths result in different initial locations and subsequent migration behaviors of the nanoclays. The dense and short chain nanosheets are distributed at the interfacial region and form percolation networks, significantly blocking the concentration fluctuation and domain coarsening. The sparse and long chain nanosheets are initially distributed in the SAN-rich domains and slowly migrate to the interfacial region, inhibiting phase separation and stabilizing the morphology.
Article
Biochemistry & Molecular Biology
Yingli Ding, Xiangjian Chen, Dong Huang, Baomin Fan, Li Pan, Kunyu Zhang, Yuesheng Li
Summary: A novel poly(epichlorohydrin-co-ethylene oxide)-g-poly( methyl methacrylate) copolymer (ECO-g-PMMA) was successfully synthesized via the AMP method, which significantly improved the performance of PLA when used as a toughening agent and compatibilizer for PIA and PLA/ECO blends. The ternary PLA/ECO/ECO-g-PMMA copolymer blends exhibited remarkably high impact strength and showed a unique quasi-continuous network structure with varying ECO-g-PMMA content, demonstrating excellent mechanical performance.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Chemistry, Physical
Yaaser Q. Almulaiky, N. M. Khalil, Yousif Algamal, Adel Al-Gheethi, Abdallah Aissa, Saleh Mohammed Al-Maaqar, Mohamed Himmed, Muhammad Bilal, J. Alkabli, Reda M. El-Shishtawy
Summary: The aim of this study was to investigate and identify the optimal conditions for immobilizing peroxidase on chitosan-decorated alumina-zirconia-titania composites (AZT) activated with glutaraldehyde. Response surface methodology was used to optimize the immobilization conditions, and the results showed that the best immobilization efficiency and enzyme activity were achieved with 40 mg of AZT composites, 1.5% glutaraldehyde, 200 units of enzyme, and a pH of 6.5. The mineralogical structure of the prepared AZT and CS/AZT was studied using X-ray diffraction patterns, while scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy were used to analyze the morphological and chemical properties of the immobilized peroxidase on CS/AZT. The study also found that the immobilized peroxidase exhibited a residual activity of 85% after 15 repetitions, and the residual activity of both immobilized and free enzymes after 12 weeks of storage was 81% and 32% of their initial activity, respectively. Based on these findings, it can be concluded that peroxidase immobilization technology is promising for industrial applications.
Article
Materials Science, Composites
Thottyeapalayam Palanisamy Sathishkumar, Jesus de-Prado-Gil, Rebeca Martinez-Garcia, LakshmiNarasimhan Rajeshkumar, Guruswamy Rajeshkumar, Sanjay Mavinkere Rangappa, Suchart Siengchin, Abeer Mohamed Alosaimi, Mahmoud Ali Hussein
Summary: This study explores the use of waste glass fiber reinforced polymers and new woven glass fiber mats to manufacture composite materials with improved mechanical and vibration properties for structural applications. The results show that composites with 40% virgin woven glass fiber mats exhibit higher mechanical strength, with tensile strength, flexural strength, and modulus of 243 MPa, 1752 MPa, and 1244 MPa, 946 MPa, and impact strength of 12.13 J. Additionally, the combination of new and recycled glass fiber composites also performs well, with tensile strength, flexural strength, and modulus of 211 MPa, 1734 MPa, 1222 MPa, and 925.7 MPa, and impact strength of 10.43 J. Theoretical modeling provides accurate predictions with minimal margin of difference compared to experimental results.
POLYMER COMPOSITES
(2023)
Article
Engineering, Environmental
Karthikeyan Ramalingam, Senthil Muthu Kumar Thiagamani, Harikrishnan Pulikkalparambil, Chandrasekar Muthukumar, Senthilkumar Krishnasamy, Suchart Siengchin, Abeer Mohamed Alosaimi, Mahmoud Ali Hussein, Sanjay Mavinkere Rangappa
Summary: Due to the increasing environmental consciousness, the use of natural fibers in composite materials has become inevitable, especially in lightweight semi-structural applications in the automotive and aerospace industries. This study investigated the properties of raw and NaOH treated Abelmoschus ficulneus weed plant fibers, and found that the treated fibers exhibited improved mechanical and thermal properties, making them potential reinforcement materials for composites used in semi-structural applications.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Engineering, Environmental
Mallikarjunagouda B. B. Patil, Shridhar N. N. Mathad, Arun Y. Y. Patil, Anish Khan, Mahmoud Ali Hussein, Abeer M. M. Alosaimi, Abdullah M. M. Asiri, A. Manikandan, Mohammad Mujahid Ali Khan
Summary: The study prepared poly(vinyl alcohol) (PVA) and starch-based polymeric films with different concentrations of grapefruit seed extract (GSE). The films showed improved mechanical properties and antimicrobial efficacy when a small amount of GSE was incorporated.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Biochemistry & Molecular Biology
Nadiyah Alahmadi, Mahmoud A. Hussein
Summary: An unpretentious, non-toxic, and cost-effective method was used to synthesize anticancer and biologically active hybrid nanocomposite materials containing cellulose acetate. Hybrid nanofillers based on ZnO and Ag NPs were prepared via green procedures. The nanocomposite materials showed good thermal stability and demonstrated antimicrobial and anticancer activities against six pathogens and breast cancer cells.
Article
Multidisciplinary Sciences
Khalid A. Alamry, Ajahar Khan, Jeenat Aslam, Mahmoud A. Hussein, Ruby Aslam
Summary: This study investigates the use of expired ampicillin as a corrosion inhibitor for mild steel in an acidic environment. The inhibitor showed a high inhibitory efficiency of over 95% at 55 degrees C. It increased the charge transfer resistance at the steel-solution interface and significantly decreased the corrosion current density. The adsorption of the inhibitor on the steel substrate followed the Langmuir adsorption isotherm, involving physical and chemical adsorption mechanisms.
SCIENTIFIC REPORTS
(2023)
Article
Polymer Science
Mostafa A. Hussien, Gadeer R. Ashour, Soha M. Albukhari, Tamer S. Saleh, Mahmoud A. Hussein
Summary: This research synthesized a new series of heteroaromatic thiazole-based polyurea derivatives with sulfur links in the polymers' main chains. Characterization methods confirmed the structures of the premonomer, monomer, and fully generated polymers. The polymers showed thermal stability and distinct surface morphologies. The study also evaluated the antimicrobial and antifungal activities of the polymers.
Article
Chemistry, Multidisciplinary
O. F. Al Sharif, L. M. Nhari, R. M. El-Shishtawy, A. M. Asiri
Summary: Imidazole is an essential building block in biological, optical, and electrical fields due to its unique bipolar configuration, which enhances the functionality of its derivatives. These imidazole-based fluorophores have characteristics such as simple synthesis, low cost, and high performance, making them suitable for optical applications such as sensing and organic light emitting diodes. Furthermore, they also exhibit exciting characteristics like aggregation-induced emission and mechanofluorochromism, which broaden their potential applications in electroluminescence and bio-imaging.
MATERIALS TODAY CHEMISTRY
(2023)
Review
Biotechnology & Applied Microbiology
Abeer M. Alosaimi, Randa O. Alorabi, Dina F. Katowah, Zahrah T. Al-Thagafi, Eman S. Alsolami, Mahmoud A. Hussein, Mohammad Qutob, Mohd Rafatullah
Summary: Hybrid materials, particularly those with biopolymeric matrices reinforced by different carbon sources, have attracted significant interest from researchers in recent decades. These materials exhibit diverse properties, with applications ranging from biomaterials to drug delivery systems. This research focuses on natural biopolymers composed of carbon materials and explores their educational and medical applications, such as tissue engineering and scaffold bones.
BIOENGINEERING-BASEL
(2023)
Article
Construction & Building Technology
H. Mohit, Mavinkere Rangappa Sanjay, Laongdaw Techawinyutham, Suchart Siengchin, Abeer Nasser Al-Romaizan, Mahmoud A. Hussein, Anish Khan, Abdullah M. Asiri
Summary: Plant cellulose fibers were used to fabricate banana-boron nitride-carbon fabric and coir-multi walled carbon nanotubes-Innegra fabric hybrid polyester laminates with different chemical treatments. The physical, mechanical, and thermal characteristics of the laminates were determined. The addition of chemically treated/untreated banana/coir fillers in the polyester matrix was confirmed by FTIR spectra and SEM. The chemically treated banana/coir fiber reinforced polyester hybrid laminates showed higher thermal stability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Sultan A. Al-horaibi, Abdel-Basit. Al-Odayni, Abdulmajeed. Alezzy, Mohammed. ALSaeedy, Waseem. Saeed, Ahmed Hasan, Reda M. El-Shishtawy
Summary: This study synthesized two novel squaraine dyes SQI-P and SQI-H and employed them as near-infrared (NIR) sensitizers in dye-sensitized solar cells (DSSC). The experimental results showed that the SQI-P/SQI-H sensitizer exhibited strong absorption in the NIR region, improved electron injection efficiency, and excellent photostability. By optimizing the co-sensitized DSSC, the combination of the NIR-absorbing squaraine-based indoline with SQI-P achieved a high photocurrent output of 22.3 mA/cm2 at an efficiency of 4.8%, representing a breakthrough for DSSCs in the NIR region.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Physical
Elham N. Bifari, Paulo Almeida, Reda M. El-Shishtawy
Summary: Global warming and rising energy needs have spurred interest in alternative energy technologies. Dye-sensitized solar cells, particularly those using cyanine and hemicyanine-based organic photosensitizers, offer potential for cost-effective photovoltaic energy conversion. This article reviews the latest advances in the structural design and synthetic approaches, as well as the performance and photophysical characteristics of these photosensitizers. Strategies for utilizing them in solar cells and the potential for optimizing the conversion efficiency of photovoltaic cells are also discussed.
MATERIALS TODAY ENERGY
(2023)
Review
Chemistry, Multidisciplinary
Maha A. A. Alshubramy, Khalid A. A. Alamry, Mahmoud A. A. Hussein
Summary: C3-symmetric star-shaped materials are a promising class of porous organic polymers with unique properties. This review focuses on constructing benzene or s-triazine rings as the center of C3-symmetric molecules and utilizing side-arm reactions to introduce functionalities. Additionally, the performance of various polymerization processes, such as trimerization and polycondensation, as well as the biomedical applications of these materials, are discussed.
Review
Chemistry, Multidisciplinary
Salsabeel Al-Sodies, Abdullah M. Asiri, Khalid A. Alamry, Mahmoud A. Hussein
Summary: In recent years, scientists in the electroactivity field have been interested in sensor applications. Safranine and luminol, combined with different nanomaterials, have been explored as sensors for various analytes using electrochemical and chemical techniques. This work provides a comprehensive review of the applications of poly(safranine) and poly(luminol) in sensor technology, including their synthesis methods and impressive impact as electrochemical sensors over the last few decades.
Article
Clinical Neurology
Ohoud A. Alomari, Safaa Qusti, Maha Balgoon, Fadwa Aljoud, Khalid A. Alamry, Mahmoud A. Hussein
Summary: Alzheimer's disease is a common neurodegenerative disease in old age, involving the accumulation of beta-amyloid peptide and mitochondrial dysfunction. This study investigates the potential of a modified TPP/MoS2 QD blend in managing Alzheimer's disease through protecting microglial cells and reducing inflammation. The results demonstrate that the blend has a beneficial impact on cell viability, oxidative stress, mitochondrial function, and cytokine expression in microglial cells stimulated by beta-amyloid peptide.
NEUROLOGY INTERNATIONAL
(2023)