Article
Thermodynamics
Jan Ozimek, Dariusz Sternik, Paulina Radzik, Edyta Hebda, Krzysztof Pielichowski
Summary: The thermal properties of nanohybrid polyurethanes synthesized from HDI, BDO, PTMG, and PHI-POSS were analyzed using TG/FTIR/MS coupled method, showing that POSS addition can improve thermal performance and form silica-rich char residues acting as barriers for gas and mass transport.
THERMOCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Osamu Shimomura, Hideki Kusu, Atsushi Ohtaka, Ryoki Nomura
Summary: The catalytic activity of α-zirconium phosphates intercalated with 1,8-diazabicyclo [5,4,0]undec-7-ene as a thermal latent catalyst in the reaction of hexamethylene diisocyanate (HDI) and phenol was investigated. The intercalation compound showed high catalytic activity under heating conditions and extended pot lifetimes at 25 degrees Celsius.
Article
Biophysics
Iwona Zarzyka, Anna Czerniecka-Kubicka, Karol Heclik, Lucjan Dobrowolski, Beata Krzykowska, Anita Bialkowska, Mohamed Bakar
Summary: Poly(3-hydroxybutyrate) (P3HB) is an important polyhydroxyalkanoate that is biodegradable, biocompatible, and shows no cytotoxicity and mutagenicity. It can replace synthetic polymers in the production of implants. However, P3HB has limited thermal stability and is brittle. By producing P3HB based composites using linear aliphatic polyurethanes as modifiers, its mechanical properties and processing parameters can be improved. This study aims to modify P3HB properties using polyurethanes synthesized from hexamethylene diisocyanate (HDI) and polypropylene glycols (PPG). The biocomposites obtained showed improved impact strength, relative strain at break, and higher degradation temperature compared to unfilled P3HB.
ACTA OF BIOENGINEERING AND BIOMECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Lau Kia Kian, Mohammad Jawaid, Salman Alamery, Ashok Vaseashta
Summary: The study focuses on producing poly(D-lactic acid) (PDLA) membranes with nanocrystalline cellulose (NCC) and cellulose nanowhisker (CNW) fillers at different loadings, showing improved pore formation, surface wettability, thermal and mechanical properties, and water permeability. These CNW-filled PDLA membranes have high potential for future water filtration applications.
Article
Chemistry, Multidisciplinary
Zhihe Wei, Yanhui Su, Weiyi Pan, Junxia Shen, Ronglei Fan, Wenjun Yang, Zhao Deng, Mingrong Shen, Yang Peng
Summary: Silicon semiconductor functionalized with graphene layer and catalyst immobilization improves the performance and stability of the photocathode. Altering the stacking configuration of the immobilized catalyst further enhances the electron transfer rate and the photoelectrochemical (PEC) performance. The graphene-coated Si cathode immobilized with catalyst demonstrates remarkable PEC CO2RR performance in neutral solution.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Electrical & Electronic
Ashish A. Nimbekar, Rajendra R. Deshmukh
Summary: In this study, Polyaniline (PANI) was grafted onto polyester fabric through chemical oxidative polymerization, with O-2 plasma treatment enhancing grafting uniformity and conductivity. The strong interfacial bonding achieved on the surface of polyester fabric showed promising results for detection of ammonia gas.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Polymer Science
Cynthia Guerrero-Bermea, Sofia Vazquez-Rodriguez, Saul Sanchez-Valdes, Jorge Alonso Uribe-Calderon
Summary: This study reports the production of hybrid organoclays composed of Cloisite 20A and modified graphene oxide (r-mGO) at different proportions, and their effect on the properties of PP composites. The results show that the laminated hybrid material exhibited homogeneous intercalation of Cloisite 20A and r-mGO, resulting in a rigid polymeric composite with improved mechanical properties at low filler content.
Article
Polymer Science
K. Arun, Sangita Sen, K. K. Sunisha, S. Sankar, M. T. Ramesan
Summary: Nanocomposites based on polypyrrole (PPy) and silicon nanoparticles (Si) were successfully synthesized using a one-step polymerization technique. The nanocomposites showed improved thermal stability, glass transition temperature, dielectric characteristics, electrical conductivity, and gas sensing capability. The inclusion of nanoparticles in the PPy matrix and their uniform dispersion in the nanocomposites were confirmed by various analytical tools.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Engineering, Mechanical
Giuseppe Mirone, Raffaele Barbagallo
Summary: There is still room for improvements in material characterization at high strain rates, particularly in understanding the interactions between strain, strain rate, and temperature effects. This study analyzed the behavior of A2-70 stainless steel at different strain rates and temperatures, highlighting how strain rate and temperature sensitivities affect necking onset and hardening. The experimental results showed that inertia effect plays a secondary role in necking onset, and parameters based on specimen diameter can quantify the approximation intrinsic to simplified calculations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Daohan Ge, Yuan Zhang, Hui Chen, Guangfu Zhen, Minchang Wang, Jiwei Jiao, Liqiang Zhang, Shining Zhu
Summary: This study investigates the impact of surface morphology and roughness of patterned silicon nitride substrates on graphene, discovering a strong correlation with Raman scattering and stress. The peak red-shifts in 2D and G bands of graphene are attributed to strain induced by different surface morphology and roughness patterns. It is found that the effect of morphology on patterned areas is more pronounced than the role of surface roughness in inducing strain in graphene.
MATERIALS & DESIGN
(2021)
Article
Biochemistry & Molecular Biology
Ling Fu, Long Jiang, Qingtao Xing, Tan Li, Zhiquan Shen, Yi Dan, Yun Huang
Summary: This study aims to solve the problems of compatibility and dispersion between industrial grade graphene oxide (GO) and polylactide (PLA) in order to achieve practical application. PLA was grafted on GO using a silane coupling agent (KH560) to enhance compatibility, while poly(d-lactide) (PDLA) was grafted on GO to form crystallites with poly(l-lactide) (PLLA) and improve dispersion. Biaxially stretched PLLA and GO composite films were prepared. The film with 5% D-G (PLLA/D-G0.05) showed the smallest size of aggregated GO and the best tensile performance with a tensile strength of 120 MPa and an elongation at break of 107%.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Composites
Hao Zhang, Fei Cai, Yanlong Luo, Xiao Yu, Sizhu Wu
Summary: In this study, silica-modified reduced graphene oxide (rGO-g-SiO2) was fabricated through hydrosilylation, and applied to enhance the performance of styrene butadiene rubber (SSBR) composites. The structural and morphological characterization confirmed the presence of SiO2 on the rGO surface. The mechanical and thermal properties of rGO-g-SiO2/SSBR were significantly improved due to enhanced interfacial interaction and higher degree of phonon matching. The reinforcing index and thermal conductivity of 1.5%-rGO-g-SiO2/SSBR were found to be 168.7% and 114.0% higher than that of 1.5%-rGO/SiO2/SSBR, respectively.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Textiles
Rey Fernando Garcia-Mendez, Carlos I. Cortes-Martinez, Armando Almendarez-Camarillo
Summary: This study investigates the thermochemical and tensile properties of fibers mechanically extracted from Agave angustifolia Haw leaves. The fibers are mainly composed of cellulose and exhibit thermal stability. Tensile strength is inversely related to fiber diameter, while tensile strength and strain are directly related to gauge length.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Polymer Science
Bedriye Ucpinar Durmaz, Miray Gozde Atilgan, Ayse Aytac
Summary: Graphene oxide (GO) and reduced graphene oxide (rGO) were used as nanofillers in the fabrication of PET/PBT/G nanocomposites. The study found that samples containing rGO were more ductile compared to those containing GO, and there were agglomerations with an increase in nanofiller loading levels. The mechanical, thermomechanical, thermal, and electrical properties of the nanocomposites were improved.
IRANIAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Sandra Paszkiewicz, Izabela Irska, Agata Zubkiewicz, Anna Szymczyk, Elzbieta Piesowicz, Zbigniew Rozwadowski, Krzysztof Goracy
Summary: A series of PHF-b-F-pTHF copolymers were synthesized using a two-stage procedure and characterized through various analytical techniques, showing that an increase in the amount of flexible segments affects the physical properties of the copolymers, with the copolymer containing 75 wt.% F-pTHF units demonstrating promising thermoplastic shape memory polymer properties.
Article
Computer Science, Interdisciplinary Applications
Josea. Luceno, Mariano Martin
COMPUTERS & CHEMICAL ENGINEERING
(2019)
Review
Polymer Science
Ana Maria Diez-Pascual, Jose Antonio Luceno Sanchez, Rafael Pena Capilla, Pilar Garcia Diaz
Article
Thermodynamics
Jose A. Luceno, Mariano Martin
Article
Polymer Science
Jose Antonio Luceno Sanchez, Rafael Pena Capilla, Ana Maria Diez-Pascual
Article
Chemistry, Multidisciplinary
Jose Antonio Luceno-Sanchez, Georgiana Maties, Camino Gonzalez-Arellano, Ana Maria Diez-Pascual
Review
Biochemistry & Molecular Biology
Jose Antonio Luceno-Sanchez, Ana Maria Diez-Pascual, Rafael Pena Capilla
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2019)
Article
Polymer Science
Jose Antonio Luceno Sanchez, Ana Maria Diez-Pascual, Rafael Pena Capilla, Pilar Garcia Diaz
Article
Thermodynamics
Federico Lozano-Santamaria, Jose A. Luceno, Mariano Martin, Sandro Macchietto
Article
Engineering, Chemical
Jose Antonio Luceno, Ester de la Fuente, Mariano Martin
Summary: This study presents a two-stage approach for the design and evaluation of solar central tubular receivers' performance, obtaining the design through optimization problems and determining the performance afterward. Different locations were found to affect the size of receiver elements, requiring a comprehensive analysis to balance various factors.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Polymer Science
Jose A. Luceno-Sanchez, Ana Charas, Ana M. Diez-Pascual
Summary: Developed HDI-modified GO and its nanocomposites with PEDOT:PSS showed improved morphology, thermal, electrical, thermoelectrical, and mechanical performance. The study found that HDI-GO increased crystallinity, lamella stacking, and interchain coupling of PEDOT:PSS chains, leading to enhancements in electrical conductivity, thermal stability, Young's modulus, and tensile strength, with an optimum combination at 2 wt% loading. Various deposition techniques and parameters impacting the process were explored, paving the way for further research on optimizing composition and properties of conducting polymer/modified GO nanocomposites for device applications such as OSCs.
Article
Computer Science, Interdisciplinary Applications
Federico Lozano Santamaria, Jose A. Luceno, Mariano Martin, Sandro Macchietto
Summary: Concentrated Solar Power plants utilize solar radiation to provide renewable energy, where the optimal design and operation of air coolers are crucial. Modular design and optimized operation can reduce operating costs and improve efficiency, as shown in the study on CSP plants in different locations with varying external conditions.
COMPUTERS & CHEMICAL ENGINEERING
(2021)
Review
Polymer Science
Ana M. Diez-Pascual, Jose A. Luceno-Sanchez
Summary: This article presents the current state-of-the-art in antimicrobial polymeric nanocomposites reinforced with graphene and its derivatives, along with a classification of different nanocomposites. The mechanisms of antimicrobial activity of graphene and its derivatives are also reviewed in the article.
Proceedings Paper
Engineering, Chemical
Jose A. Luceno, Mariano Martin
27TH EUROPEAN SYMPOSIUM ON COMPUTER AIDED PROCESS ENGINEERING, PT C
(2017)
