Article
Materials Science, Composites
Sreenivas Huligere Thimmaiah, Krishnamurthy Narayanappa, Yashas Thyavihalli Girijappa, Arpitha Gulihonenahali Rajakumara, Mohit Hemath, Senthil Muthu Kumar Thiagamani, Akarsh Verma
Summary: This research aims to study the hybridization of fiber-reinforced composites using kenaf fabric and kevlar fabric as reinforcement. Through testing and a prediction model, the tribological behavior and wear rate of the composites, as well as the wear principle of the structure under different conditions, can be understood.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Hideto Tsuji, Sena Nogata, Hirotada Gamo, Kazuhiro Hikima, Atsunori Matsuda, Yuki Arakawa
Summary: This study investigated enantiomeric aromatic poly(lactic acid)s and their crystallization, thermal properties, and degradation. It was found that high molecular weight poly(L-mandelic acid) and poly(d-mandelic acid) exhibited predominant stereocomplex crystallization, while low molecular weight blends showed both stereocomplex and homo-crystallization. The aromatic poly(mandelic acid) had higher glass transition temperatures and lower melting temperatures compared to previously reported poly(lactic acid)s. The thermal degradation temperatures of the blends were higher than those of enantiomeric poly(lactic acid)s and similar to enantiomeric poly(2-hydroxybutanoic acid)s. The study also compared the crystallizability of aromatic poly(mandelic acid) and poly(phenyllactic acid).
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Polymer Science
Xuan-Yu He, Ting Wang, Zhong-Cheng Pan, Abdul Qadeer Dayo, Jun Wang, Wen-Bin Liu
Summary: In this article, a novel multifunctional benzoxazine monomer MB-FH was successfully synthesized with high reaction efficiency and short reaction time. The introduction of hydroxyl groups greatly improved the curing and thermal properties of polybenzoxazine.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Moritz Stuck, Irina Krenz, Benedikt Schulze Koekelsum, Susanne Boye, Brigitte Voit, Reinhard Lorenz
Summary: The study focused on the influence of different curing conditions and styrene concentrations on the resin properties, demonstrating that the Tg of the network can be increased by applying new thermal curing profiles and increasing the styrene content. Additionally, the partial substitution of problematic styrene with substances like maleic anhydride was found to significantly improve the reactivity and mechanical properties of the resin.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Ulku Soydal
Summary: In this study, two types of biobased epoxy composites were prepared using alkali-treated cotton waste and nanoclay as reinforcements. The composites were characterized and their properties were evaluated. The results showed that both alkali-treated cotton waste and nanoclay could enhance the mechanical properties and thermal stability of the composites.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Yue Yin, Bo Jiang, Linghui Meng
Summary: By introducing sulfonated 1,4-butanediol as the third monomer into PET polymer, the nucleation efficiency and crystallization temperature of PET were successfully increased, avoiding the damage to the mechanical properties of PET caused by excessive addition of traditional nucleating agents.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Tristan Butler, Caleb Bunton, Heonjune Ryou, Boris Dyatkin, Nickolaus Weise, Matthew Laskoski
Summary: This study evaluates the correlation between chemical structures and performance-essential thermal, mechanical, and long-term stability properties of cross-linked thermosets by preparing resins of different molecular weights from the Bisphenol A based PEEK (TM)-like oligomeric phthalonitrile (BisA). The results show a positive correlation between increasing oligomer molecular weight and properties like melting points, cure initiation conditions, and char yields. Rheological studies also indicate significant viscosity increases with higher molecular weights. Hardness analysis reveals different brittleness and hardness in the cured polymers cross-linked with different molecular weights.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Yin Lu, Yaliang Peng, Yi Yang, Jiahao Liu, Kan Zhang
Summary: In this study, a benzoxazine monomer (oHPNI-fa) with both norbornene and furan groups was designed and synthesized to meet the urgent need for novel high-performance resins in the aerospace and electronics industries. The molecular structure of oHPNI-fa was verified through various characterization techniques. The thermally activated terpolymerization of oHPNI-fa was monitored and its low-temperature-curing characteristics were revealed and discussed. The resulting highly cross-linked thermoset based on oHPNI-fa exhibited excellent thermal stability and flame retardancy. The molecular design strategy used in this study provides a guide for the development of high-performance resins for aerospace and electronics applications.
Article
Polymer Science
Dongsheng Li, Zhiyong Zhang, Siqi Wang, Miaojun Xu, Bin Li
Summary: The introduction of BDEMPP into EP thermosets significantly improves flame retardancy, mechanical performance, and transparency while inhibiting heat and smoke release. BDEMPP exerts flame retardant effects in both gaseous and condensed phases, demonstrating good performance in EP thermosets.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Applied
S. S. Nechausov, A. A. Aleksanova, O. S. Morozov, B. A. Bulgakov, A. Babkin, A. Kepman
Summary: Novel dual-functional phthalonitrile monomers containing a maleimide group were synthesized and characterized, showcasing a combination of bismaleimide resins' mechanical properties and phthalonitriles' thermo-oxidative stability. The copolymerization of maleimide groups via ene reaction and ring-opening amidation allowed the formation of a polymeric system with high impact strength, flexural strength, and excellent thermal properties.
REACTIVE & FUNCTIONAL POLYMERS
(2021)
Article
Polymer Science
Yasmine N. Baghdadi, Jihad Sinno, Kamal Bouhadir, Mohammad Harb, Samir Mustapha, Digambara Patra, Ali R. Tehrani-Bagha
Summary: The paper successfully improved the mechanical properties and thermal stability of epoxy composites by synthesizing graphitic carbon nitride (g-C3N4) nanoparticles and reinforcing them. The addition of 0.5 wt% g-C3N4 showed the best results, with an increase in tensile strength and fracture toughness by 21.8% and 77.3% respectively, leading to a transition from a brittle to rough morphology in the composite materials.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Mateus Hofmann, Mario Garrido, Marina Machado, Joao R. Correia, Joao C. Bordado
Summary: Research on biobased thermoset resins has been overlooked compared to biobased thermoplastics. This study developed low-molecular weight macromolecules with a high bio-content, suitable for various fiber-reinforced polymer production techniques. The resulting resins exhibited comparable mechanical and thermomechanical behavior to petrochemical-based counterparts, making them greener alternatives for high-performance structural applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Chunbiao Wang, Yu Feng, Changhai Zhang, Tiandong Zhang, Qingguo Chi, Qingguo Chen, Qingquan Lei
Summary: This study introduced cyanate ester (CE) and polyhedral oligomeric silsesquioxanes (POSS) into epoxy to improve the dielectric and thermal properties and successfully synthesized a new packaging material that can be used in high-temperature environments and has excellent dielectric properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Jonas C. Koelsch, Christian M. Berac, Francisco Lossada, Oliver S. Stach, Sebastian Seiffert, Andreas Walther, Pol Besenius
Summary: This study reports a biobased vitrimer prepolymer synthesized from renewable resources. The obtained vitrimer materials, which are based on cross-linkers, show elastomeric properties and can be easily controlled in terms of rheological properties and recycled. The findings provide a sustainable solution for vitrimer networks that were previously limited to epoxy-based networks.
Article
Polymer Science
Kursat Gultekin, Gediz Uguz, Yildiray Topcu, Adnan Ozel
Summary: This study investigated the effect of doping silanized hexagonal boron carbide nanoparticles in varying proportions into the epoxy resin on the structural, thermal, and mechanical properties of nanocomposites. The results showed significant improvements in mechanical and thermal properties with the optimum doping ratio determined as 2% by weight.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Engineering, Environmental
Luciana da Silva Dutra, Marcio Nele de Souza, Jose Carlos Pinto
Summary: The study investigates the influence of the continuous phase on the kinetic behavior of suspension PBS reactions and the morphological aspects of PBS particles produced. Results show that soybean oil can be successfully used as the continuous phase for polycondensations, allowing for production of microparticles with regular spherical morphology.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Thermodynamics
G. D. Barbosa, C. L. M. Camargo, G. B. Freitas, A. C. P. Duncke, L. B. S. Balestrin, O. C. C. Poltronieri, M. Nele, F. W. Tavares
Summary: This study introduces a molecular thermodynamic approach to optimize the properties of microemulsions by minimizing the total Gibbs energy based on surfactant molecular structure and solution conditions. By investigating the self-aggregation behavior of different non-ionic surfactants and modeling the phase behavior of alkylphenol ethoxylate surfactant systems, the equilibrium micelle structure was described and model parameters were optimized. The study applied particle swarm optimization to minimize Gibbs free energy for both oil-in-water and water-in-oil microemulsions and compared experimental data with computed critical micelle concentration and micelle size to evaluate the predictive performance of the model.
FLUID PHASE EQUILIBRIA
(2021)
Article
Mechanics
Thiago O. Marinho, Flavio H. Marchesini, Marcia C. K. de Oliveira, Marcio Nele
Summary: The study quantified the effects of apparent wall slip on rheometric measurements of waxy gels, showing that apparent slip significantly affects the shape of flow curves and the measured yield stress values. Using geometries with grooved parts improves the reproducibility of rheological measurements.
JOURNAL OF RHEOLOGY
(2021)
Article
Engineering, Chemical
Jose Ramon, Vinicius Goncalves, Aline Alvarenga, Vivian Saez, Marcio Nele, Tito Alves
Summary: This study focuses on a continuous process that combines protein purification with PEGylation to reduce costs and enhance the stability of the conjugate. The optimal operating conditions were determined, and the traditional buffer change step in PEGylation process was successfully eliminated.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Biotechnology & Applied Microbiology
Maria Clara Guimaraes Pedrosa, Susana Azevedo dos Anjos, Elena Mavropoulos, Pablo Leite Bernardo, Jose Mauro Granjeiro, Alexandre Malta Rossi, Marcos Lopes Dias
Summary: This study characterized the physicochemical properties and biological compatibility of electrospun polycaprolactone (PCL) membranes with or without nanostructured hydroxyapatite (HA) or Zn-doped HA, finding that the addition of nanoparticles improved the thermal stability of the membrane and its suitability for tissue regeneration.
JOURNAL OF BIOACTIVE AND COMPATIBLE POLYMERS
(2021)
Review
Chemistry, Medicinal
Javier Mauricio Anaya Mancipe, Franz Acker Lobianco, Marcos Lopes Dias, Rossana Mara da Silva Moreira Thire
Summary: Recent studies have found a significant increase in skin cancer cases in northern regions where it was previously uncommon. Melanoma, the most deadly form of skin cancer globally, has prompted researchers to explore alternative treatments using nano medicine concepts to address its resistance to current therapies.
MINI-REVIEWS IN MEDICINAL CHEMISTRY
(2022)
Article
Polymer Science
Aline Luiza M. Carlos, Javier Mauricio A. Mancipe, Marcos L. Dias, Rossana M. S. M. Thire
Summary: Electrospinning is commonly used for micro- and nanofibers production, while solution blow spinning (SBS) provides a safer alternative for certain applications. In this study, core-shell fibers were produced using SBS with PHBV showing better morphology and stability. The core-shell structure allows for sustained release of bioactive agents, and rotating collectors can produce smaller diameter fibers effectively.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Physical
Isabela Fernandes Soares, Marcia Cristina K. de Oliveira, Monica Feijo Naccache, Marcio Nele
Summary: The focus of this work is to investigate the interfacial rheology of fatty acid and commercial mixture of naphthenic acid, and to propose acidic molecular interaction at the water-oil interface. The experimental results reveal that the presence of fatty acid can form rigid and viscoelastic films upon deformations and higher cation content. Moreover, the emulsions containing fatty acid are more stable in high pH environments.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2023)
Review
Polymer Science
Pamela Roberta Alves da Costa, Livia Rodrigues de Menezes, Marcos Lopes Dias, Emerson Oliveira da Silva
Summary: Diabetes is a chronic disease that has a significant impact on the global population, and it is projected to increase in the coming years. The electrospinning technique is being used to aid the healing of diabetic wounds by forming nanofibers, which have shown effectiveness in tissue regeneration and potential for modified drug release.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Engineering, Biomedical
Javier Mauricio Anaya Mancipe, Leonardo Cunha Boldrini Pereira, Priscila Grion de Miranda Borchio, Marcos Lopes Dias, Rossana Mara da Silva Moreira Thire
Summary: In this study, a coaxial electrospinning process was proposed to fabricate core-shell nanofiber mats of Col_1/PVA. This strategy preserved the structure of collagen and simplified the manufacturing process. The resulting nanostructured mats showed good biocompatibility, liquid absorption, and structural stability, making them a potential dressing for skin damage regeneration.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Agnes Chacor de Figueiredo, Javier Mauricio Anaya-Mancipe, Aline Oliveira da Silva de Barros, Ralph Santos-Oliveira, Marcos Lopes Dias, Rossana Mara da Silva Moreira Thire
Summary: This study investigated the effect of PCL hydrolysis on the morphology of electrospun mats loaded with propolis. The presence of beads did not affect the release pattern of propolis, but propolis-loaded mats composed of beaded fibers promoted cell migration, showing potential for wound dressing applications.
Article
Polymer Science
Ana Chor, Christina Maeda Takiya, Marcos Lopes Dias, Raquel Pires Goncalves, Tatiana Petithory, Jefferson Cypriano, Leonardo Rodrigues de Andrade, Marcos Farina, Karine Anselme
Summary: The study shows that electrospun PLGA membranes have good biocompatibility and can promote the healing of oral ulcers, mimicking the extracellular matrix and promoting the flow of nutrients for cells.
Article
Pharmacology & Pharmacy
Javier M. Anaya-Mancipe, Vanessa M. Queiroz, Rafael F. dos Santos, Rosane N. Castro, Veronica S. Cardoso, Alane B. Vermelho, Marcos L. Dias, Rossana M. S. M. Thire
Summary: This study developed and evaluated a nanostructured PCL electrospun dressing with Plantago major extract for wound healing. The dressing showed high antioxidant capacity and moisture absorption, which are important for skin healing. The extract-controlled release occurred within the first 24 hours, demonstrating its potential for wound healing.
Article
Polymer Science
Ana P. Arcanjo, Denisson O. Liborio, Santiago Arias, Florival R. Carvalho, Josivan P. Silva, Bernardo D. Ribeiro, Marcos L. Dias, Aline M. Castro, Roger Frety, Celmy M. B. M. Barbosa, Jose Geraldo A. Pacheco
Summary: In this study, the chemical recycling of PET residues was carried out using Mg-Fe and Mg-Al oxide catalysts derived from layered double hydroxides, with glycolysis using ethylene glycol as the catalyst. The catalysts prepared using the low supersaturation method showed higher PET conversion compared to the high supersaturation method. The Mg-Fe catalysts exhibited higher PET conversion than the Mg-Al catalysts, and could be reused multiple times with high conversion rates.
Article
Energy & Fuels
Andre S. Guimaraes, Thiago O. Marinho, Priamo A. Melo, Roney L. Thompson, Marcia C. K. de Oliveira, Marcio Nele
Summary: This study presents a novel coupled kinetic and rheological model for paraffinic wax oil gelation. The crystallization kinetics was investigated using differential scanning calorimetry, while the rheological properties were determined through dynamic oscillatory tests. The effect of cooling rate on fractal dimensional analysis was examined for different wax concentrations. The gathered data were successfully reconciled using scaling models, allowing for the discussion of microstructural characteristics. Additionally, simulations of waxy oil gelation during a pipeline shutdown were conducted based on the observed kinetic and rheological behavior.
GEOENERGY SCIENCE AND ENGINEERING
(2023)