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RISS 인기검색어
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- 저자 : Wenzhao Shi (검색결과 4 건)
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Jiankun Dong,Wenzhao Shi,Jinshu Liu,Shaofeng Lu,Hongjuan Zhou,Shanshan Cui,Manyan Zhang,Guoxin Su 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
Polyurethane phase change materials (PUPCMs) have been extensively applied in smart textiles and wearable electronic devices because of their excellent energy storage capacity. To realize the flexibility of PUPCMs for certain deformation and compact contact with objects, suitable support structures have been chosen to prepare polyurethane phase change composites (PUFPCCs) with energy storage capacity and device-level flexibility. In this work, PUPCM was prepared by the prepolymer method with polyethylene glycol (PEG) as the soft segment, 4,4-dicyclohexylmethane diisocyanate (HMDI) and 1,2-hexanediol as the hard segment. And polyurethane-based adhesives (PUA) were chosen to provide a support structure for PUFPCCs by physically blending and casting with prepared PUPCM. PUFPCCs showed good flexibility attributed to the film-forming performance of polyurethane-based adhesive in the composites. The chemical structure, crystallization properties, phase transformation properties and thermal stability of the prepared PUPCM and PUFPCCs were investigated via Fourier transform infrared spectroscopy (FT-IR), 1H NMR spectroscopy, X-ray diffraction (XRD), polarizing optical microscope (POM), differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis respectively. The phase change temperature of PUFPCCs ranged from 36 to 40 ℃. The maximum enthalpy value of PUFPCCs was up to 40 J/g for daily application. Moreover, the thermal stability of PUPCM was improved attribute to the support structure of PUA in PUFPCCs. Therefore, the prepared PUFPCCs have great potential for application in flexible wearable devices due to their excellent flexibility, suitable phase transition temperature close to human body temperature, high enthalpy value and improved thermal stability.
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Yan Xie,Shaofeng Lu,Wenzhao Shi,Haizhu Wang,Kuang Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.9
Water-based polyurethane (WPU) provides a number of benefits over typical solvent-based polyurethane. WPU ismore environmentally friendly, safe, and reliable. The WPU with polycaprolactone diol/polycarbonate diol (PCL/PCDL)complex soft segment was developed using a prepolymer technique to enhance the color depth of cotton knitted fabrics dyedwith reactive dyes. The appearance, particle size, zeta potential, and viscosity of WPU emulsions were analyzed. Thechemical structure, thermal stability, phase change performance, and topography of WPU films were characterized byFourier-transform infrared (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and atomicforce microscopy (AFM), respectively. The tensile and hydrophilic properties of the WPU films were examined by anelectronic universal testing machine and contact angle goniometer, respectively. The K/S value, rubbing fastness, washingfastness, and wearability of finished and unfinished dark cotton knitted fabrics were measured. Simultaneously, the chemicalstructure and morphology of fabrics were investigated using FTIR and scanning electron microscopy (SEM). The resultsshow the WPU-2 emulsion demonstrated excellent stability, and the WPU-2 film showed superior thermal stability. The K/Svalue of the dark cotton knitted fabric finished with WPU-2 emulsion (40 g/l) increased by 18.58 %, and the wet rubbingcolor fastness of the resulting fabric was enhanced. The SEM results show a layer of film covered the surface of the finishedfabric. In summary, the WPU can provide a new technique for enhancing the color depth of fabrics.
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Jifeng Yu,Xinlong Pang,Wenzhao Fu,Jason Hilton,Mingmei Liang,Zongkai Jiang,Xiuli Zhao,Wenyan Qiao,Suo Shi,Diandong Zhang,Huitao Cao,Haibo Jia,Yadong Wang,Xiaoke Hu,Rui Zhang 한국지질과학협의회 2021 Geosciences Journal Vol.25 No.5
The Miocene aged Shanwang Formation from the Shanwang National Geopark in China represents a succession of lacustrine diatomaceous shales containing an abundant and diverse biota with lagerstätte fossilization of soft tissues. To date, the Shanwang Formation has not been investigated for cyclostratigraphy nor has it been dated with high precision methods. Now we use thorium data as a paleoenvironmental and paleoclimatic proxy to conduct a detailed cyclostratigraphic analysis. A new and simple cyclostratigraphic method, Wavelet Scale Series Analysis (WSSA) is developed to recognize Milankovitch cycles. A total of three short eccentricity and fifteen precession cycles are identified; obliquity cycles are not apparent. In the sedimentary succession, the corresponding precession and short eccentricity cycles are 1.17 m and 4.98 m thick respectively, with this verified by Correlation Coefficient (COCO) analysis and Multitaper-Method (MTM) spectral analysis. We estimate the studied interval was deposited over a duration of 0.3 Myr with a depositional rate of c. 5.7 cm/kyr. Paleomagnetic and radio isotope dating data shows that the diatomaceous shale was deposited during Chron C5En, which places it at approximately 18.5 Ma during the Burdigalian stage of the Early Miocene, rather than in the Middle Miocene as previously thought. The Shanwang lagerstätte biota therefore predates the Middle Miocene Climate Optimum (MMCO) and did not form within it. The geological time scale with a high resolution of 20 kyr was set accordingly.
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Salt-Free and Alkali-Free Fixing Method of Wool Fabric Dyeing in Non-Aqueous Media Dyeing System
Liujun Pei,Jingyuan Yi,Jingru Chen,Wenhua Shi,Wenzhao Cao,Hongjuan Zhang,Jiping Wang 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
Non-aqueous media dyeing is an important water-saving and salt-free dyeing technology in the textile dyeing industry. In thisinvestigation, a salt-free and alkaline-free dyeing technology was developed for wool fabrics. After padding with reactivedye solution, wool fabric was fixed in a non-aqueous medium at 90 °C for 90 s. After washing, the fixation of reactive dyecan achieve more than 98% in a salt-free and alkali-free dyeing environment. The effect of fixing method on the physicalproperties of wool fabrics was analyzed by TGA, DSC, and XRD. Compared with steam and cold batch fixing method, thefixing process in non-aqueous medium has little effect on the mechanical properties of wool fabrics. The final decompositiontemperature of wool fabric dyed with non-aqueous medium was about 46 °C, which was higher than that of the fabric samplesdyed by other methods. Moreover, the crystallinity of wool fiber was increased after non-aqueous fixation process. And nonaqueousmedium had no influence on the surface morphology of wool fabrics. For non-aqueous medium and steaming fixingmethods, there were only hydrolyzed dyes, but some hetero-bifunctional dyes were detected in the cold batching system,indicating that reactive dyes could effectively react with wool fibers in non-aqueous medium and steaming fixing system.
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