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- 저자 : Yuqin Tian (검색결과 2 건)
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Zengcheng Yu,Yuqin Xiao,Huafeng Tian,Shilin Liu,Jian Zeng,Xiaogang Luo 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10
Using agricultural wastes (bagasse) and polyol derived from soy oil as raw materials to develop biodegradable rigid polyurethane foams (RPUFs) is beneficial to reduce the dependence on petroleum resources and promote the sustainable socioeconomic and environmental development. This study focuses on bagasse as a functional filler to improve and control the mechanical properties and biodegradability of the RPUFs. With the increasing levels of bagasse content, the density and mechanical properties of RPUFs increase. The biodegradation of RPUFs has a greater enhancement compared to the foam without bagasse, and all bio-foams have excellent thermal insulation properties. All changes in foam performance are due to the fact that the active hydroxyl groups on bagasse react with excess isocyanate to form urethane, which affects the structure of RPUFs. In this study, scientific design and molecular regulation theory were applied to improve the utilization value of bagasse and develop high-performance biodegradable RPUFs for thermal insulation materials
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Enalapril maleate as a green accelerator for zinc phosphating coating on low-carbon steel
Weishan Wang,Yuqin Tian,Aojue Ke,Haowei Huang,Huifang Shen,Xinya Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
In this study, enalapril maleate (EM), a green ingredient of an antihypertensive drug, was selected as anaccelerator for phosphate coating promoting on low-carbon steel. The scanning electron microscope(SEM), X-ray diffraction (XRD), 3D morphologies, coating weight, coating thickness and free acidity(FA) as well as total acidity (TA) were characterized to analyze the coating performance. Copper sulfatetitration, potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) wereperformed to evaluate corrosion resistance of phosphate coatings. The DFT computations were appliedto explore the phosphating promoting mechanism. The results show that the EM optimal concentrationis 1.6 g/L which lowers the operating temperature (form 80 ℃ to 40 ℃), generates the smoothest (Ra = 2. 85 lm), the heaviest (28.35 g/cm2) and the thinnest (21.6 lm) coating, and reduces the corrosion ratefrom 1.099 mpy of blank to 0.0246 mpy. The density functional theory (DFT) results confirm that EMadsorbs on low-carbon steel by electrophilic sites (N10) as well as nucleophilic sites (C10), forms nucleatedparticles preferentially and accelerates the growth of crystals. Therefore, EM is a green organic compoundwith high phosphating promotion efficiency which has potential application prospects inindustrial phosphating.
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