Article
Materials Science, Multidisciplinary
Evi Triwulandari, Widya Fatriasari, Apri Heri Iswanto, Melati Septiyanti, Eko Fahrul Umam, Muhammad Ghozali
Summary: This paper investigated the synthesis of polyurethane modified epoxy through varying reaction time and analyzed its properties. The results showed that reaction time affected the molecular weight and distribution of the modified epoxy, and increasing reaction time enhanced certain performance indicators.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Biochemistry & Molecular Biology
Moran Aviv, Dana Cohen-Gerassi, Asuka A. Orr, Rajkumar Misra, Zohar A. Arnon, Linda J. W. Shimon, Yosi Shacham-Diamand, Phanourios Tamamis, Lihi Adler-Abramovich
Summary: Supramolecular hydrogels formed by the self-assembly of amino-acid based gelators are gaining attention in the fields of biomedicine and material science. Modifying the position of a single atom, such as fluorine, can have significant effects on the self-assembly process and physical properties of the product, demonstrating fluorination as an effective strategy to influence supramolecular organization on the nanoscale. A deep understanding of the self-assembly process may facilitate the development of optimized amino-acid-based low-molecular-weight hydrogelators for various applications.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Zhiwen Wang, Yan Jiang, Xiaomei Yang, Junhuan Zhao, Wanlu Fu, Na Wang, De-Yi Wang
Summary: A functionalized APP flame retardant (APP-Cu@PDA) was developed and added to TPU to significantly improve the flame-retardant performance of the composite material, without affecting its mechanical properties.
Article
Polymer Science
Mingtao Sun, Shuang Huang, Muhuo Yu, Keqing Han
Summary: The melt blending of polylactic acid (PLA) and thermoplastic silicone polyurethane (TPSiU) elastomer effectively toughens PLA by improving its mechanical properties and impact strength.
Article
Chemistry, Applied
Changhao Wu, Jixiao Wang, Meichao Lan, Zhan Wang, Zhi Wang
Summary: In this study, novel TPUs (PDMS/FA-PUDAs) were prepared by incorporating biomass furfuryl alcohol (FA) and non-toxic polydimethylsiloxane (PDMS) through classic polymerization route accompanied by Diels-Alder (DA) reaction. The experimental results showed that the addition of 10% PDMS and FA modified TPU film exhibited high stimulate-healing efficiency and superior mechanical properties and anti-adhesion behavior. This investigation provides a new perspective for designing multifunctional TPUs using renewable and non-toxic materials.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Polymer Science
Yuyang Wang, Guangping Zou, Junpeng Liu
Summary: The effect of the type and content of functional groups on the interfacial shear properties of a functionalized graphene sheet (FGS)/thermoplastic polyurethane (TPU) nanocomposite was investigated using molecular dynamics simulations. The study found that adding carboxyl or hydroxyl groups on the surface of graphene can enhance the interfacial shear properties of the TPU/FGS system due to the strong interaction of electrostatic forces and H-bonds. Increasing the content of functional groups modified on the graphene surface can also improve the interfacial shear properties.
Article
Chemistry, Physical
Yun-seok Jun, Saeed Habibpour, Mahdi Hamidinejad, Moon Gyu Park, Wook Ahn, Aiping Yu, Chul B. Park
Summary: Graphene nano-ribbon (GNR) was synthesized by unzipping multi-walled carbon nanotubes (MWCNTs) and compared to MWCNT/TPU composites in terms of electrical conductivity, dielectric properties, electromagnetic interference shielding effectiveness (SE) and mechanical properties. GNR/TPU exhibited superior performance in all aspects, including significantly enhanced electrical conductivity, dielectric properties and EMI SE, as well as higher mechanical strength.
Article
Polymer Science
Xiulu Gao, Huan Qian, Yichong Chen, Yujia Hui, Ling Zhao, Dongdong Hu
Summary: A new foaming strategy utilizing water and PTFE as co-blowing agents was developed to prepare microcellular TPU with high volume expansion ratio, low shrinkage, and stable mechanical properties at low temperature. The synergistic effect of water and PTFE improved the micro-phase separation structure of TPU and enhanced its properties.
Article
Polymer Science
Xian-Chao Jin, Tian-Jun Yue, Bai-Hao Ren, Wei-Min Ren, Xiao-Bing Lu
Summary: In this study, a novel thermoplastic polyurethane (TPU) elastomer was developed using a polysulfite oligomer derived from the copolymerization of SO2 and propylene oxide (PO) as the soft segments (SSs). It was found that increasing the hard segment (HS) content improved tensile strength but reduced stretchability when the SS molecular weight was constant. On the other hand, both tensile strength and stretchability decreased with increasing SS molecular weight when the HS content was constant. The SO2-based TPU elastomers exhibited superior mechanical properties compared to poly(propylene oxide)-based TPU elastomers obtained via the same method, making it an attractive option for utilizing SO2.
Article
Green & Sustainable Science & Technology
Xiaoyi Ban, Zengping Zhang, Pengtao Chang, Suyu Zhang, Hao Liu, Yuzi Liang, Yujing Chen
Summary: The effect of polyol on polyurethane-modified asphalt was analyzed by synthesizing three different soft segments of polyurethane and reacting them with MDI. FTIR and GPC tests were used to analyze the PU samples, while DSR, BBR, MSCR, FTIR, and DSC tests were used to analyze the rheological properties and modification mechanism of asphalt. The results showed that the molecular weight of the polyol influenced the molecular structure of polyurethane, the distribution of soft and hard segments, the content of soft segments, and the distribution of asphaltene in asphalt, resulting in different asphalt modification effects. The storage stability and high-temperature stability of the polyurethane-modified asphalts synthesized using different molecular weights of polyols did not differ significantly, and the PU1400-modified asphalt exhibited the best low-temperature performance.
Article
Polymer Science
Hyejin Kim, Kyung Jin Lee
Summary: Thermoplastic polyurethane (TPU) has been widely used in various fields for its elasticity, abrasion resistance, and processability. A post-crosslinking method is proposed in this study to adjust the mechanical properties of TPU by using different types and amounts of crosslinkers, simplifying the tedious optimization of the synthetic process.
Article
Chemistry, Analytical
Zhi-Min Zhou, Ke Wang, Kai-wen Lin, Yue-Hui Wang, Jing-Ze Li
Summary: The study investigated the influence of TPU masterbatches with different melting points on the distribution of graphene, electrical conductivity, and infrared light thermal properties of graphene-thermoplastic polyurethane (G-TPU) composite films. It was found that the characteristics of TPU had little impact on the electrical conductivity, but significantly affected the thermal conductivity of the composite films.
Article
Materials Science, Composites
L. Simonini, H. Mahmood, A. Dorigato, A. Pegoretti
Summary: This study aims to develop a PLA-based material with well-balanced stiffness and toughness to overcome the brittleness issue of commercial grade PLA. Composites were prepared by blending PLA with increasing contents of TPU and a fixed concentration of CFs, which were acid-treated to enhance the interfacial adhesion. The results showed improved tensile modulus, maximum stress, and elongation at break, demonstrating the effectiveness of this approach in preparing novel PLA-based materials with tailorable properties.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Stephanie Liffland, Marc A. Hillmyer
Summary: The study found that star-shaped polymers outperformed linear polymers in terms of ultimate tensile strength, tensile toughness, and recovery characteristics, demonstrating the impact of polymer architecture on TPE mechanical properties. In the field of sustainable materials, simple changes in macromolecular architecture can significantly enhance material performance.
Article
Automation & Control Systems
Budi Arifvianto, Teguh Nur Iman, Benidiktus Tulung Prayoga, Rini Dharmastiti, Urip Agus Salim, Muslim Mahardika, Suyitno
Summary: This study investigates the effects of extruder temperature and raster orientation on the mechanical properties of FFF-processed TPU elastomer, concluding that the optimal parameters are 200 degrees Celsius and 0 degrees.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Analytical
El Hadji Dieye, Alioune Fall, Modou Fall, Carlos Arthur Ferreira, Mauro R. S. Silveira, Alessandra F. Baldissera
Summary: Electropolymerisation of pyrrole was conducted in the presence of two ionic liquids, and the resulting PPy films were characterized using various electrochemical techniques. The PPy electrosynthesized with the presence of 1,2-dimethylimidazolium methylsulfate showed promising results for the detection of Cu(2+) using Differential Pulse Anodic Stripping Voltammetry.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Applied
Raiane Valenti Goncalves, Isadora Quinhones Liposki, Lucas Weber Dias, Alessandra Fiorini Baldissera, Mauro Ricardo da Silva Silveira, Carlos Arthur Ferreira, Leila Bonnaud, Nara Regina de Souza Basso
Summary: A corrosion protection material using commercial benzoxazine and polyaniline (PAni) was developed, where PAni doped with cardanol showed better anticorrosion performance and adhesion strength in coatings applications. The incorporation of cardanol-doped PAni in benzoxazine also reduced the cure temperature of the material.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2022)
Article
Polymer Science
Lidia Kunz Lazzari, Daniele Perondi, Ademir Jose Zattera, Ruth Marlene Campomanes Santana
Summary: The reuse of poultry litter waste for the production of biochar and carbon cryogels as CO2 adsorbents presents an attractive perspective to minimize environmental damage caused by CO2 emissions.
POLIMEROS-CIENCIA E TECNOLOGIA
(2022)
Article
Materials Science, Textiles
Ruan Ezequiel Gemmer, Cleide Borsoi, Betina Hansen, Marcos Aurelio Dahlem Junior, Edson Luiz Francisquetti, Lilian Vanessa Rossa Beltrami, Ademir Jose Zattera, Andre Luis Catto
Summary: In this study, nanocellulose was extracted from agro-industrial residue of yerba mate using chemical, physical, and mechanical treatments, showing that steam explosion as the initial treatment step significantly increased the crystallinity index of cellulose nanofiber. Furthermore, samples treated by steam explosion and ultra-fine grinding showed a higher yield compared to other treatment methods.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Multidisciplinary
El Hadji Dieye, Alioune Fall, Modou Fall, Carlos Arthur Ferreira, Mauro R. S. Silveira, Alessandra F. Baldissera
Summary: Polyaniline was synthesized in the presence of two ionic liquids and used to prepare cation-exchange membranes for the removal of heavy metals. The membranes showed extraction percentages ranging from 80.63% to 96.04% for Cu2+, 87.89% to 99.55% for Pb2+, and 68.53% to 88.03% for Cd2+.
EMERGENT MATERIALS
(2022)
Article
Materials Science, Paper & Wood
Roberta Motta Neves, Heitor Luiz Ornaghi, Benoit Duchemin, Ademir Jose Zattera, Sandro Campos Amico
Summary: This study investigates the grafting amount and structural characteristics of microcrystalline cellulose (MCC) functionalized with 3-aminopropyltriethoxysilane (APTES) (MCC-Si) at different contents. Three different methods for quantifying the APTES grafting amount were compared, and supplementary analyses were performed. The nitrogen content method showed better correlation with the grafting amount. The structural properties of MCC-Si samples were explored using nuclear magnetic resonance, Fourier-transform infrared spectroscopy, and scanning electron microscopy.
Article
Materials Science, Multidisciplinary
Luis Felipe de Paula Santos, Carlos Eduardo Moraes, Tamires Repullio do Amaral, Mauro Ricardo da Silva Silveira, Carlos Arthur Ferreira, Bruno Ribeiro, Michelle Leali Costa, Edson Cocchieri Botelho
Summary: Carbon nanotubes play an important role in the research of nanostructured thermoplastic composites, as they can enhance the thermal stability and reduce the heat release of the composites. Furthermore, the addition of carbon nanotubes also improves the viscoelastic properties and long-term stability of the materials.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Polymer Science
Henrique Carvalho de Oliveira, Alessandra Lavoratti, Iaci Miranda Pereira, Tamara Indrusiak Silva, Bluma Guenther Soares, Lilian Vanessa Rossa Beltrami, Ademir Jose Zattera
Summary: This study developed epoxy resin/graphene nanoplatelets (NPG) composites with different mass fractions of graphene nanoplatelets for galvanized steel substrates. The results showed that the composites containing 0.25% mass fraction of NPG exhibited the best microwave absorber performance.
JOURNAL OF POLYMER ENGINEERING
(2022)
Article
Materials Science, Textiles
Danieli Dalle, Betina Hansen, Ademir Jose Zattera, Heitor Luiz Ornaghi, Francisco Maciel Monticeli, Andre Luis Catto, Cleide Borsoi
Summary: Tobacco residues were treated with different concentrations of NaOH and different exposure times, and their thermogravimetric curves were modeled using an artificial neural network. A 3D surface response was created to predict the thermogravimetric curves at different heating rates.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Paper & Wood
Heitor Luiz Ornaghi, Roberta Motta Neves, Eduardo Fischer Kerche, Francisco Maciel Monticeli, Ademir Jose Zattera
Summary: This study evaluated the creep behavior of micro-cellulose epoxy-based composites and investigated the effect of silanization treatment on the reinforcements. The results showed that micro crystalline cellulose improved the structural integrity of the composites, and the incorporation of silanized-MCC increased the mechanical behavior of the composite.
Article
Chemistry, Applied
D. Strassburger, M. R. Silveira, A. F. Baldissera, C. A. Ferreira
Summary: Intumescent coatings are widely used in civil construction for their ability to provide structural safety and human safety in the event of a fire. The development of water-based intumescent paints has become essential due to restrictions on volatile organic compound emissions. This study developed water-based intumescent coatings and tested their fire resistance, as well as characterized the carbonaceous layers formed during the fire.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2023)
Article
Polymer Science
Otavio Bianchi, Patricia Bereta Pereira, Carlos Arthur Ferreira
Summary: This study explores the use of a high-speed thermokinetic mixer for recycling ground tire rubber (GTR) through mechanochemical treatment. Different processing conditions are found to reduce the gel fraction and result in various degradation effects and physicochemical changes. An artificial neural network is utilized to describe and correlate the thermal degradation profile with the processing conditions and characteristics of the GTR.
Review
Polymer Science
Pieter Gijsman, Rudinei Fiorio
Summary: This study focuses on the degradation and stabilization of pristine polypropylene (PP) and its significance in recycling. Post-consumer PP has different chemical structures due to degradation, which affects its thermo-oxidative stability. The review outlines the chemical reactions causing PP degradation and the mechanisms of action of important stabilizers to support mechanical recycling. The heterogeneous degradation of PP, its infectious spreading, and the influence of stabilizers are emphasized, as they are crucial for proper stabilization and recyclability of PP in its first lifetime cycle.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Hannelore Ohnmacht, Rudinei Fiorio, Tom Wieme, Dagmar R. D'hooge, Ludwig Cardon, Mariya Edeleva
Summary: This study investigates 15 hybrid filler composites containing aluminum oxide, graphite, expanded graphite, carbon nanotubes, or a combination of these fillers, using extrusion-compression processing. The experimental density of the specimens is lower than the theoretical density, especially for composites with high filler contents, due to the presence of air inclusions. The addition of fillers increases both the melt viscosity and the thermal conductivity.
Article
Polymer Science
Juliano R. Ernzen, Jose A. Covas, Angel Marcos-Fernandez, Rudinei Fiorio, Otavio Bianchi
Summary: This study focuses on the synthesis of thermoplastic polyurethanes (TPUs) using a renewable bio-based polyol obtained from soybean oil. The addition of this bio-based polyol enhances compatibility between the segments of the TPU but may also promote cross-linking. Adding small amounts of the bio-based polyol results in high-molecular-weight TPUs with lower polarity, suitable processability, and improved mechanical properties.
