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  • Open Access

    ARTICLE

    New Nano Polymer Materials for Composite Exterior-Wall Coatings

    Yue Yu*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.10, pp. 2681-2694, 2023, DOI:10.32604/fdmp.2023.028250

    Abstract A triethylenetetramine epoxy mixture was synthesized through the reaction of a low-molecular-weight liquid epoxy resin with triethylenetetramine (TETA). Then triethyltetramine (TETA) was injected dropwise into a propylene glycol methyl ether (PM) solution for chain extension reaction. A hydrophilic and flexible polyether segment was introduced into the hardener molecule. The effects of TETA/DGEPG, reaction temperature and reaction time on the epoxy conversion of polyethylene glycol diglycidyl ether (DGEPG) were studied. In addition, several alternate strategies to add epoxy resin to the high-speed dispersion machine and synthesize MEA DGEBA adduct (without catalyst and with bisphenol A diglycidyl ether epoxy resin) were compared.… More >

  • Open Access

    ARTICLE

    Evaluation of Novel Chitosan Based Composites Coating on Wettability for Pure Titanium Implants

    Qahtan A. Hamad1, Hanaa A. Al-Kaisy1, Mohanad N. Al-Shroofy1, Noor K. Faheed2,*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1601-1612, 2023, DOI:10.32604/jrm.2023.023213

    Abstract This work aims to prepare chitosan (CS)-based coated layers, CS (10 wt% nanosilver/90 wt% CS, 10 wt% biotin/90 wt% CS, and 5 wt% nanosilver–5 wt% biotin)/90 wt% CS coatings are prepared, onto pure Ti substrate. The surface morphology of the novel CS composite coating was studied using field emission scanning electron microscopy, atomic force microscopy (AFM), Fourier transforms infrared (FTIR) and wettability test. Results show that the addition of (biotin, nanosilver) 5 Vol.% improves the properties of composite materials. Using different particles’ scale size aid in improving the combinations in the alginate, producing a dual effect on film properties. Coating… More > Graphic Abstract

    Evaluation of Novel Chitosan Based Composites Coating on Wettability for Pure Titanium Implants

  • Open Access

    ARTICLE

    Molecular Dynamics Simulation of Interface Properties between Water-Based Inorganic Zinc Silicate Coating Modified by Organosilicone and Iron Substrate

    Hengjiao Gao1, Yuqing Xiong1,*, Kaifeng Zhang1, Shengzhu Cao1, Mingtai Hu1, Yi Li1, Ping Zhang2, Xiaoli Liu3

    Journal of Renewable Materials, Vol.11, No.4, pp. 1715-1729, 2023, DOI:10.32604/jrm.2022.024023

    Abstract The interface properties of Fe(101)/zinc silicate modified by organo-siloxane (KH-570) was studied by using the method of molecular dynamics simulation. By calculating the temperature and energy fluctuation of equilibrium state, equilibrium concentration distribution, MSD of layer and different groups, and interaction energy of two interface models, the influencing mechanism on the interface properties of adding organosiloxane into coating system was studied at the atomic scale. It shows that the temperature and energy of interface oscillated in a small range and it was exited in a state of dynamic equilibrium within the initial simulation stage (t < 20 ps). It can… More > Graphic Abstract

    Molecular Dynamics Simulation of Interface Properties between Water-Based Inorganic Zinc Silicate Coating Modified by Organosilicone and Iron Substrate

  • Open Access

    ARTICLE

    An ADRC Parameters Self-Tuning Control Strategy of Tension System Based on RBF Neural Network

    Shanhui Liu1,*, Haodi Ding1, Ziyu Wang1, Li’e Ma1, Zheng Li2

    Journal of Renewable Materials, Vol.11, No.4, pp. 1991-2014, 2023, DOI:10.32604/jrm.2022.023659

    Abstract High precision control of substrate tension is the premise and guarantee for producing high-quality products in roll-to-roll precision coating machine. However, the complex relationships in tension system make the problems of decoupling control difficult to be solved, which has limited the improvement of tension control accuracy for the coating machine. Therefore, an ADRC parameters self-tuning decoupling strategy based on RBF neural network is proposed to improve the control accuracy of tension system in this paper. Firstly, a global coupling nonlinear model of the tension system is established according to the composition of the coating machine, and the global coupling model… More > Graphic Abstract

    An ADRC Parameters Self-Tuning Control Strategy of Tension System Based on RBF Neural Network

  • Open Access

    ARTICLE

    Bio-Based High Functionality Polyols and Their Use in 1K Polyurethane Coatings

    Thomas J. Nelson, Lindsey Bultema, Neal Eidenschink, Dean C. Webster*

    Journal of Renewable Materials, Vol.1, No.2, pp. 141-153, 2013, DOI:10.7569/JRM.2013.634113

    Abstract Bio-based polyols with high functionality were successfully synthesized by ring-opening epoxidized sucrose esters of soybean oil with methanol under acidic conditions, and were subsequently formulated with blocked isocyanates to form one package polyurethanes (1KPU). The bio-based polyols were characterized by gel permeation chromatography (GPC), Fourier transform infrared (FTIR) spectroscopy, proton nuclear magnetic resonance (1 H-NMR) spectroscopy, and Brookfi eld viscosity. Bio-based coatings were prepared by formulating the polyols with blocked polyisocyanates based on isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI). Two types of bio-based polyols were synthesized and the ratio of NCO:OH functional groups was varied to explore the effect… More >

  • Open Access

    ARTICLE

    Impact of Biodegradable Chitosan-Based Coating on Barrier Properties of Papers

    Nicolas Bordenave1,2,3,*, Diana Kemmer4, Sonja Smolic4, Roland Franz4, Florence Girard5, Veronique Coma1,2,*

    Journal of Renewable Materials, Vol.2, No.2, pp. 123-133, 2014, DOI:10.7569/JRM.2014.634105

    Abstract Aroma and oxygen-barrier properties of chitosan-coated papers were measured in order to evaluate the potential of these materials as biodegradable materials for food packaging. Firstly, two chitosans (Chi- 244 and Chi-652) were studied according to their ultimate biodegradability. Chi-652 showed the best fi nal biodegradation rate and was then used for subsequent tests in association with papers. Then, oxygen-barrier and aroma-barrier properties of papers, Chi-652 fi lms and Chi-652-coated papers were investigated. The Chi-652 fi lms exhibited oxygen-barrier at low relative humidity and aroma-barrier comparable to synthetic materials already used in the packaged food industry. Both papers exhibited poor barrier… More >

  • Open Access

    ARTICLE

    Renewable Resource-Based Hybrid Crosslinker for Sustainable Industrial Coatings

    Dinesh Balgude, Anagha Sabnis*

    Journal of Renewable Materials, Vol.2, No.3, pp. 235-245, 2014, DOI:10.7569/JRM.2014.634115

    Abstract Renewable resource-based hybrid crosslinker was successfully synthesized via sol-gel technology. The synthesis involved malenization of Cashew Nut Shell Liquid (CNSL) followed by its silane modifi cation and subsequent hydrolysis and condensation with tetraethyl orthosilicate (TEOS). The synthesized crosslinker was characterized by spectroscopic analysis (FT-IR, 1 H-NMR, 13C-NMR and 29Si-NMR) for structural elucidation. The crosslinker was further formulated in a conventional stoving system. Fully-cured coatings were obtained after stoving at 120°C for ½ hr and were then evaluated for physical, mechanical, chemical, optical, accelerated weathering, electrochemical and morphological properties. The incorporation of hybrid crosslinker in a conventional stoving system was observed… More >

  • Open Access

    ARTICLE

    Synthesis and Characterization of Jatropha Curcas Oil-Based Alkyd Resins and Their Blends with Epoxy Resin

    Pronob Gogoi, Dhaneswar Das, Shyamalima Sharma, Swapan K. Dolui*

    Journal of Renewable Materials, Vol.3, No.2, pp. 151-159, 2015, DOI:10.7569/JRM.2014.634129

    Abstract Alkyd resins based on Jatropha curcas oil with different molar ratios of phthalic anhydride (PA) and maleic anhydride (MA) were prepared by alcoholysis followed by polyesterifi cation reaction. The progress of the reaction was traced by the determination of acid value at regular time intervals. From the kinetic study the extent of the reaction was found in the range of 52.4–61.2%. The prepared resins were blended with a commercially available fast-curing epoxy resin in order to improve the properties like curing time, chemical resistance, tensile strength, and thermal stability. The morphology study of the blends showed good compatibility of alkyd… More >

  • Open Access

    ARTICLE

    Thermal Analysis of Turbine Blades with Thermal Barrier Coatings Using Virtual Wall Thickness Method

    Linchuan Liu1, Jian Wu2, Zhongwei Hu2, Xiaochao Jin1,*, Pin Lu1, Tao Zhang2, Xueling Fan1,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.134, No.2, pp. 1219-1236, 2023, DOI:10.32604/cmes.2022.022221

    Abstract A virtual wall thickness method is developed to simulate the temperature field of turbine blades with thermal barrier coatings (TBCs), to simplify the modeling process and improve the calculation efficiency. The results show that the virtual wall thickness method can improve the mesh quality by 20%, reduce the number of meshes by 76.7% and save the calculation time by 35.5%, compared with the traditional real wall thickness method. The average calculation error of the two methods is between 0.21% and 0.93%. Furthermore, the temperature at the blade leading edge is the highest and the average temperature of the blade pressure… More >

  • Open Access

    ARTICLE

    A CFD-DEM-Wear Coupling Method for Stone Chip Resistance of Automotive Coatings with a Rigid Connection Particle Method for Non-Spherical Particles

    Jiacheng Qian1, Chenqi Zou1, Mengyan Zang1,*, Shunhua Chen2,3,*, Makoto Tsubokura4

    CMES-Computer Modeling in Engineering & Sciences, Vol.133, No.2, pp. 251-280, 2022, DOI:10.32604/cmes.2022.020738

    Abstract The stone chip resistance performance of automotive coatings has attracted increasing attention in academic and industrial communities. Even though traditional gravelometer tests can be used to evaluate stone chip resistance of automotive coatings, such experiment-based methods suffer from poor repeatability and high cost. The main purpose of this work is to develop a CFD-DEM-wear coupling method to accurately and efficiently simulate stone chip behavior of automotive coatings in a gravelometer test. To achieve this end, an approach coupling an unresolved computational fluid dynamics (CFD) method and a discrete element method (DEM) are employed to account for interactions between fluids and… More >

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