Article
Polymer Science
Nasrollah Hamidi
Summary: PVC tubing products have replaced cast iron sewer and piping systems, metal and wood in window frames. The availability of disposed or postconsumer PVC allows for upcycling, recycling, and downcycling, creating economic opportunities and reducing environmental burden. This study examines the thermal characteristics of a film made of wPVC and evaluates the isoconversional degradation energy barrier values using kinetic models.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Thermodynamics
Mustafa Versan Kok, Berk Bal, Mikhail A. Varfolomeev, Danis K. Nurgaliev
Summary: This research investigates the non-isothermal thermogravimetric analysis and kinetics of oil shale samples at different heating rates and in the air atmosphere. The results show that the decomposition of oil shale samples follows two successive reaction stages, combustion and mineral decomposition, in different temperature intervals. The study determines the reaction intervals, peak temperature, mass loss, and derivative mass loss rate values of oil shale samples. It also calculates the combustibility indices and activation energy values using various model-free methods. Kinetic models are validated by comparing experimental and simulated conversion curves.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Energy & Fuels
Sergey Vyazovkin, Nikita Muravyev
Summary: Many publications in Biomass Conversion and Biorefinery have recently addressed the use of single heating rate methods in pyrolysis data analysis, highlighting their limitations in determining reliable kinetic parameters. The reasons and examples of the failure are briefly discussed and emphasized. The International Confederation for Thermal Analysis and Calorimetry recommends the use of methods employing multiple heating rates for accurate kinetic analyses.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Polymer Science
Yitao Liu, Zhiyuan Zhao, Ruiyu Chen, Xiaokang Xu
Summary: Properly disposing of waste polymers is a global challenge. Thermal degradation is a promising method for recycling polymer waste into energy-dense fuels or products without causing pollution. This study investigated the thermal degradation characteristics, kinetics, thermodynamic parameters, and volatiles of micron waste polypropylene (PP) pyrolysis in nitrogen. The results show that the thermal degradation of micron waste polypropylene is a one-step reaction with a peak and average reaction rates that decrease with heating rate. The most appropriate reaction model is determined and the kinetic parameters are larger than those of PP with larger particle sizes. The thermogravimetric curves match well with the experimental results, and the thermal degradation is found to be a non-spontaneous and endothermic reaction. The concentrations of volatiles are determined in descending order.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Thermodynamics
Marcelo Kobelnik, Leonardo Antonio Valentin, Clever Aparecido Valentin, Fernando Luiz Lavoie, Jefferson Lins da Silva, Clovis Augusto Ribeiro
Summary: This study characterized two asphalt emulsions and analyzed their thermal properties and viscosity. The results showed significant differences in water loss and decomposition behavior between the two samples, but the kinetic study of dehydration and decomposition indicated similar activation energy values.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Polymer Science
Akmaral Zh. Sarsenbekova, Gaziza M. Zhumanazarova, Yerkeblan M. Tazhbayev, Gulshakhar K. Kudaibergen, Saule K. Kabieva, Zhannur A. Issina, Aigul K. Kaldybayeva, Arailym O. Mukabylova, Muslim A. Kilybay
Summary: The kinetics of thermal degradation of polymeric materials can be studied through weight loss at a constant temperature or during heating, which allows for the determination of the activation energy and other kinetic parameters of the thermal destruction process. Studying the gas evolution during the polymer heating provides additional information about the kinetics and mechanism of the thermal destruction processes. By combining mass spectrometry, IR spectroscopy, and thermal analysis, the product composition and thermal destruction kinetics can be determined, and the obtained values can predict the composition of polymers and contribute to the development of theoretical ideas about the physicochemical properties of polymers.
Article
Polymer Science
Anna C. Overholts, Molly E. McFadden, Maxwell J. Robb
Summary: Accurate and quantitative characterization of structure-mechanochemical activity relationships is crucial for understanding mechanochemical reactivity and advancing the field of polymer mechanochemistry. Ultrasound-induced mechanical activation of polymers is a common method for studying mechanophore reactivity, but traditional methods for analyzing chain scission kinetics from GPC measurements may provide misleading results. This study demonstrates the importance of spectroscopic analysis in accurately determining mechanophore activation rates, highlighting the need for a unified approach to kinetic analysis in polymer mechanochemistry.
Article
Polymer Science
Fangyi Wu, Xiaohui Bao, Jiangbo Wang
Summary: A novel phosphorus and silicon-containing flame retardant (DOPO-V-PA) was synthesized and added into thiol-ene (TE) to prepare a flame-retardant composite. The experimental results showed that the addition of DOPO-V-PA significantly reduced the peak heat release rate and total heat release of the composite material. Thermal degradation analysis revealed that the incorporation of DOPO-V-PA increased the activation energies of the composite material at high conversion rates.
Article
Agriculture, Multidisciplinary
Rodrigo Gonzalez-Ortega, Carla Daniela Di Mattia, Paola Pittia, Poklar Ulrih Natasa
Summary: The study investigated the impact of isothermal treatment and pH on the degradation kinetics of phenolic compounds in olive leaf extract solutions and their radical scavenging activity. It was found that oleuropein, the major compound, degraded more rapidly at lower pH and higher temperatures. Hydroxytyrosol concentration increased at the same pH due to oleuropein hydrolysis. Verbascoside degradation only occurred at pH 6.0. Despite changes in individual compounds, the overall reducing capacity of the compounds remained relatively constant after thermal treatments. These findings provide insights for predicting and optimizing thermal treatments in foods enriched with olive leaf extracts.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2023)
Article
Polymer Science
Peng Ren, Qingmin Li, Honglei Liu, Yunpeng Li, Peng Peng, Naifan Xue
Summary: A new research method is proposed in this study, which investigates the pyrolysis kinetic parameters based on the intrinsic characteristics of materials. An integral expression model of the reaction mechanism function and an improved method for calculating the activation energy are introduced to address the issues of latent defects and remaining life evaluation of GIS basin insulators.
Article
Polymer Science
Priyanka Singh, Vishwa Pratap Singh, Madhukar Prajapati, Ashwith Melkar, Ravi Kumar, Saikat Banerjee, Satyajit Samanta
Summary: The present study explores different types of phosphorus-based secondary antioxidants and their role in stabilizing polypropylene. Three different chemical compounds are studied to evaluate their efficiency as secondary antioxidants or processing stabilizers. Thermal stability of the polymer is predicted using degradation kinetics study and correlated with its optical, thermal, and rheological properties. Thermogravimetry analysis is performed at three different heating rates to obtain the kinetic parameters and evaluate the performance of the antioxidants. Filtration study is conducted to understand the efficacy of the stabilizers during secondary processing, by quantifying the die pressure build-up.
JOURNAL OF POLYMER ENGINEERING
(2023)
Article
Polymer Science
Jose Vinicius Melo Barreto, Ananda Karoline Camelo de Albuquerque, Nicholas Guimaraes Jacques, Renate Maria Ramos Wellen
Summary: This study investigated the curing and degradation behavior of compounds made with bisphenol A diglycidyl ether and epoxidized soybean oil, cured with itaconic acid and succinic acid. The curing process followed the SN2 reaction mechanism and showed different activation energies for the two compounds. In terms of thermal degradation, four steps were observed, with EP/SUC exhibiting the lowest activation energy. The degradation mechanisms in both compounds were controlled by nucleation and subsequent growth.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Takumi Yamamoto, Daisuke Aoki, Hideyuki Otsuka
Summary: The study successfully prepared mechanofluorescent polymers through postpolymerization modification, visualizing the scission of the polymer main chain and improving the thermal stability of the polymers.
Article
Polymer Science
Eun Yeop Choi, Chang Keun Kim
Summary: Degradation of TPU encapsulants used in underwater acoustic sensors was examined by aging in seawater, and the lifetime of TPU encapsulants was estimated using an accelerated lifetime test. The hydrolysis degradation of TPU resulted in a decrease in tensile strength, and failure times were estimated based on changes in tensile strength over aging time. A prediction model based on Arrhenius equation and Weibull distribution was determined for the lifetime prediction of TPU encapsulants.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Multidisciplinary Sciences
Gladis Miriam Aparicio Rojas, Lina Juliana Andrade
Summary: The thermal behavior of commercial chicken, beef, and pork cartilage was studied using thermal analysis techniques. The study showed different phases of dehydration, decomposition, and degradation in thermogravimetric analysis, and detected phase changes associated with exothermic or endothermic processes using differential scanning calorimetry. Mass spectrometry was used to determine the release of elements. The study provides an approximation of the behavior of commercially stored cartilage for surgical use.
Editorial Material
Polymer Science
Ignazio Blanco, Roberto Pantani, Antonio Pizzi, Andrea Sorrentino
Review
Chemistry, Multidisciplinary
Sneha Samal, Marcela Skodova, Lorenzo Abate, Ignazio Blanco
APPLIED SCIENCES-BASEL
(2020)
Editorial Material
Chemistry, Multidisciplinary
Ignazio Blanco
APPLIED SCIENCES-BASEL
(2020)
Editorial Material
Thermodynamics
Stefano Vecchio Ciprioti, Andrei Rotaru, Ignazio Blanco, Matko Erceg
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Editorial Material
Polymer Science
Ignazio Blanco
Review
Chemistry, Physical
Ignazio Blanco, Valentina Siracusa
Summary: The increasing public pressure surrounding environmental issues is driving both industrial and academic research areas to design material architectures using renewable sources. Thermal analysis techniques such as DSC, DTA, DMA, and TGA play a crucial role in understanding material properties and guiding the best design and preparation processes during the transition from fossil to renewable feedstock.
Article
Materials Science, Composites
Traian Zaharescu, Ignazio Blanco, Tunde Borbath, Istvan Borbath, Marius Maris
Summary: This paper proposes a reliable alternative for enhancing the stability of polypropylene (PP) by using modified polyhedral oligomeric silsesquioxanes (POSS). The study suggests that structures of modified POSS with substituents can effectively delay oxidative degradation, thus improving the stability of polypropylene.
JOURNAL OF COMPOSITES SCIENCE
(2021)
Review
Materials Science, Multidisciplinary
Sneha Samal, Ignazio Blanco
Summary: This article reviews the application of fiber-reinforced geopolymer composites (FRGCs) in various areas and highlights their environmentally friendly benefits. It discusses the different types of fiber reinforcements and their role in improving the mechanical performance of FRGCs, as well as the properties of FRGCs in mechanical response and durability.
Proceedings Paper
Polymer Science
Traian Zaharescu, Michelina Catauro, Ignazio Blanco
Summary: Polyhedral Oligomeric Silsesquioxane (POSS)/Ethylene-propylene-diene monomer (EPDM) composites with 3% wt of POSS were prepared at room temperature by evaporating solvent (CHCl3) from the polymer/filler system. The thermal stability of the composites was significantly improved compared to neat EPDM, demonstrating the impact of POSS molecules on degradation rate. Classification among samples at different radiation levels showed the beneficial effect of POSS presence on thermal stability.
MACROMOLECULAR SYMPOSIA
(2021)
Proceedings Paper
Polymer Science
Traian Zaharescu, Tunde Borbath, Ignazio Blanco, Istvan Borbath
Summary: This study investigates the impact of inorganic oxide compounds added as fillers on the durability of alkyd resin used as insulation material in electrical devices. It also discusses the stabilization effects of doping different atoms on the resin's thermal stability.
MACROMOLECULAR SYMPOSIA
(2021)
Proceedings Paper
Polymer Science
Sneha Sama, Ignazio Blanco, G. Crescente, Michelina Catauro
Summary: A simplified model was used to investigate the two-dimensional flow of a non-Newtonian fluid over a cylinder, focusing on the thermophysical properties of the melt elastomer flow with Prandtl variable and internal heat generation. Temperature-dependent physical properties such as velocity, contour temperature, surface temperature, and pressure were considered and discussed, along with examining the energy exchange from the surface to the fluids through the variation in the Rayleigh number.
MACROMOLECULAR SYMPOSIA
(2021)
Proceedings Paper
Polymer Science
Ignazio Blanco, Gianluca Cicala, Claudio Tosto, Giuseppe Recca, Giovanni Dal Poggetto, Michelina Catauro
Summary: This study investigated metakaolin-based geopolymers prepared with different percentages of fly ash, showing that the addition of fly ash can reduce the dehydration rate. A plateau in the properties of geopolymers was observed when the fly ash content exceeded 50%.
MACROMOLECULAR SYMPOSIA
(2021)
Proceedings Paper
Polymer Science
Michelina Catauro, Ignazio Blanco, Roberto De Santis, Teresa Russo, Giuseppina Crescente
Summary: The aim of this study was to synthesize CaO·GeO2 glass nanocomposite powders and investigate their structure using differential thermal analysis, X-ray diffraction, and Fourier Transform Infrared spectroscopy. The main crystallizing phase identified was CaGe2O5 crystals, and the potential antibacterial properties of the materials towards Escherichia coli were preliminarily studied.
MACROMOLECULAR SYMPOSIA
(2021)
Proceedings Paper
Polymer Science
Michelina Catauro, Ignazio Blanco, Daniele Naviglio, Giovanni Dal Poggetto
Summary: The aim of this study was to synthesize Nb-V oxide catalysts by sol-gel method and investigate the catalytic properties in oxidative dehydrogenation of ethane. Samples prepared with higher H2O/V ratio showed improved catalytic performance of vanadium, possibly due to better interaction between vanadium and niobium. Characterization techniques included XRD, atomic absorption, BET analysis, and TG-FTIR spectroscopy.
MACROMOLECULAR SYMPOSIA
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
Michelina Catauro, Federico Barrino, Ignazio Blanco, Giovanni Dal Poggetto, Simona Piccolella, Giuseppina Crescente, Severina Pacifico
Summary: Sol-gel chemistry was used to design new antioxidant biomaterials, incorporating the natural antioxidant compound chlorogenic acid. The hybrids showed strong scavenging capacity towards DPPH and ABTS(+) radicals, with selectivity against tumor cells observed in cytotoxicity tests. These materials may have pro-oxidant effects that interfere selectively with tumor cell growth.
MATERIALS TODAY-PROCEEDINGS
(2021)
