检索结果-南通市图书馆

Journal of Materials Science & Technology 2014年第12期30卷 1304-1310页

作者： Changqing Fang Xiaolong Liu Ruien Yu Pei Liu wanqing lei College of Printing and Packing Engineering Xi'an University of Technology

A composite composed of waste package poly（vinyl chloride）（WPVC） and organic montmorillonite（OMMT） was prepared by coextrusion, which is used for modifying asphalt. The micromorphology of the WPVC/OMMT composite and its effect on the macroscopic properties of asphalt were studied using a fluorescent microscope and an X-ray diffractometer（XRD）. The introduction of OMMT allows the WPVC to be good dispersed in the asphalt matrix, as demonstrated by differential scanning calorimetry（DSC） and Fourier transform infrared spectroscopy（FTIR） analysis. The results indicate that asphalt modified by WPVC/OMMT composites with low OMMT content results in better high-temperature storage stability and physical properties of modified asphalt.

关键词： Composite Waste plastics Characteristics Thermal properties

Correlation of Raw Materials and Waterborne Polyurethane Properties by Sequence Similarity Analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2016年第7期32卷 687-694页

作者： Xing Zhou Changqing Fang Jing Chen Shujuan Li Yan Li wanqing lei School of Mechanical and Precision Instrument Engineering Xi'an University of Technology Xi'an 710048 China Faculty of Printing Packaging Engineering and Digital Media Technology Xi'an University of Technology Xi'an 710048 China Wuxue High School Hubei 435400 China

Anionomer-type waterborne polyurethane dispersions （PUDs） were obtained from poly （propylene glycol）（PPG）, isophorone diisocyanate （IPDI） and dimethylolpropionic acid （DMPA） through a modified prepolymer isocyanate process. Two series of polyurethanes were prepared （Groups A and B） and a new prediction model based on grey relational analysis is introduced to predict the impact order of raw materials on several properties, such as solids content, viscosity, acid number and electrolytic stability of polyure- thanes. It is found that the model can successfully predict the impact of raw materials on the properties through the designed demonstration experiments. Furthermore, the results of the prediction model show that DMPA plays a key role in viscosity, oartial acid values and electrolvtic stability.

关键词： Dispersion Material properties Model Polyurethane(PU) Stability Synthesis

Synthesis of waterborne polyurethane using snow as dispersant:Structures and properties controlled by polyols utilization

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第7期35卷 1491-1498页

作者： Changqing Fang Shaofei Pan Zhen Wang Xing Zhou wanqing lei Youliang Cheng Faculty of Printing Packaging Engineering and Digital Media TechnologyXi'an University of TechnologyXi'an710048China School of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an710048China

waterborne polyurethane (WPU) dispersions have gained attention towards environm entally-friendly synthesis. In this article, a series of waterborne polyurethane em ulsions was successfully synthesized and extensively characterized in terms of thermal, mechanical properties, hydrophilic behavior and morphology. Snowwas chosen as dispersant instead of comm only used water. Preparation param eters such as intrinsic properties and molecular weight of polyols were discussed systematically. A chain structure was confirmed by Fourier transform infrared (FT-IR) spectroscopy. when com paring the nature of the polyols (PPG, PEG and PNA, 2000g/mol) of this study, as-synthesized polyether waterborne polyurethane provided higher solid content, viscosity and water-resistance. However, polyester waterborne polyurethane perform ed differently and it exhibited higher therm al stability and crystallinity. When com paring the samples (WPU-N210, WPU-N220, WPU-N230 and WPU-N240) with different molecular weight of the same polyol (PPG) used as soft segment, the emulsion WPU-N220 with molecular weight of 2000g/mol PPG provided the highest solid content and lowest viscosity. It was observed th at particle size was uniform and highly dispersed for all sam ples from TEM images. Therm ogravim etric, differential scanning calorim etry (DSC) and X-ray diffraction results dem onstrated that the emulsion WPU-N230 with m olecular weight of 3000 g/mol PPG possessed higher therm al stability and crystallinity than the other samples. The reason was that the Tg and thermal stability were increased with increasing molecular weight. when molecular weight increased, the arrangem ent of soft segm ent became more regular and so did the regularity of the molecular chains. This work demonstrated that different polyols as soft segment applied could lead to great differences in the structure and property of the resulting WPU.

关键词： Waterborne polyurethane (WPU) Snow Soft segment Polyester Polyether

Thermal properties of polyurethane elastomer with different flexible molecular chain based on para-phenylene diisocyanate

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2017年第11期33卷 1424-1432页

作者： wanqing lei Changqing Fang Xing Zhou Jiabin Li Rong Yang Zisen Zhang Donghong Liu School of Mechanical and Precision Instrument Engineering Xi' an University of Technology Xi' an 710048 China Faculty of Printing Packing Engineering and Digital Media Technology Xi'an University of Technology Xi'an 710048 China Full Institute of Food Science Zhejiang University Hangzhou 310058 China Corresponding author at: School of Mechanical and Precision Instrument Engi-neering Xi'an University of Technology Xi'an 710048 China.

This work focuses on the relationship between flexibility of molecular chains and thermal properties of polyurethane elastomer（PUE）, which laid the foundation of further research about how to improve thermal properties of PUE. A series of PUE samples with different flexibility of molecular chains was prepared by using 1,4-butanediol（1,4-BDO）/bisphenol-a（BPA） blends with different mole ratios including9/1, 8/2, 7/3, 6/4 and 5/5. As comparison, PUE extended with pure 1,4-BDO and BPA was also *** samples were characterized by differential scanning calorimetry（DSC）, thermogravimetric analysis（TGA）, dynamic mechanical analysis（DMA）, etc. The results showed that with the decrease in flexibility of molecular chains the glass transition temperature（Tg） increased and low-temperature properties became worse. Besides, all samples had a certain degree of microphase separation, and soft segments in some samples were crystallized, i.e. the decreasing flexibility of molecular chains led to the impossibility of chains tightly packing and crystalline domains forming so that the degree of microphase separation decreased and the thermal properties became worse.

关键词： Polyurethane elastomer Different flexible molecular chain Microphase separation Thermal property

Recent Advances in Synthesis of Waterborne Polyurethane and Their Application in Water-based Ink:A Review

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第7期31卷 708-722页

作者： Xing Zhou Yan Li Changqing Fang Shujuan Li Youliang Cheng wanqing lei Xiangjie Meng School of Mechanical and Precision Instrument Engineering Xi'an University of Technology Institute of Printing and Packing Engineering Xi'an University of Technology Ship Design & Research Institute Bohai Shipbuilding Heavy Industry Co.Ltd.

Over the last few years, waterborne polyurethane （WPU） was applied to various fibers, adhesives, primers for metals, caulking materials, emulsion polymerization media, paint additives, defoamers, associate thickeners, pigment pastes, textile dyes and biomaterials, resulting in the increasing enthu- siasm of researchers to design and synthesize novel WPU with unique properties. Thus, various processes and raw materials have been developed to prepare WPU. This review gives an overview on the de- velopments of WPU mainly derived from novel polyols, analyzes the potential application in water-based inks and presents the probable future research area about water-based inks. Notably, the poly（e-cap- rolactone） and poly（lactic acid） are the versatile materials used in WPU synthesis and supply the po- tential special performance for preparing WPU. Meanwhile, addition-fragmentation chain transfer （RAFT） polymerization and atom transfer radical polymerization （ATRP） processes provide an opportu- nity to control the chain sequence of WPU and obtain products with the desired performance.

关键词： Chemical synthesisDispersionComposition designNano particlesPolymerization processPolyurethane (PU)

Design,preparation and measurement of protein/CNTs hybrids:A concise review

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第11期42卷 74-87页

作者： Xing Zhou Jian Su Chenxi Wang Changqing Fang Xinyu He wanqing lei Chaoqun Zhang Zhigang Huang Faculty of Printing Packaging Engineering and Digital Media TechnologyXi'an University of TechnologyXi'an710048China School of Materials Science and Engineering Xi'an University of TechnologyXi'an710048China School of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an710048China College of Materials and Energy South China Agricultural UniversityGuangzhou510642China School of Materials Science and Mechanical Engineering Beijing Technology and Business UniversityBeijing100048China

With the development of nanobiotechnology,the carbon nanotubes(CNTs)and protein hybrids system has attracted an increasing attention for great potential application in nanotechnology,medicine,smart materials,light industry,and *** this review,the main preparation processes,impact factors,measurement of interactions and potential applications of CNTs/protein are presented from the aspect of ***,the proper forces detection methods are illustrated comprehensively to complete the quantitative *** force microscope(AFM)and surface force apparatus(SFA)experiments are described in detail to confirm the powerful function in measuring the interaction *** addition,the impact of different protein structures(amino acid residues,αHelix,polypeptide chain,and assembled subunits)on interactions between CNTs and protein is presented and different amino acid residues may intervene largely on *** to the relatively little knowledge about the structure,function,and spatial orientation of proteins interaction with CNTs surface,we assume that the key problem is how to prepare CNTs and protein specimen with unique structure(such as the variation of secondary and tridimensional structure of protein or the single CNTs)to investigate the interaction forces instead of the designed,preparation,and detection methods.

关键词： Assembly Carbon nanotubes(CNTs) Hybrid composites Protein adsorption Interaction

Additive manufacturing of CNTs/PLA composites and the correlation between microstructure and functional properties

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第1期60卷 27-34页

作者： Xing Zhou Jingrui Deng Changqing Fang wanqing lei Yonghua Song Zisen Zhang Zhigang Huang Yan Li Faculty of Printing Packaging Engineering and Digital Media TechnologyXi’an University of TechnologyXi’an710048China School of Materials Science and Mechanical Engineering Beijing Technology and Business UniversityBeijing100048China School of Materials Science and Engineering Xi’an University of TechnologyXi’an710048China School of Mechanical and Precision Instrument Engineering Xi’an University of TechnologyXi’an710048China

Owing to the facile,low cost,rapid,personalization characters,3D printing method has been one of the most attractive additive manufacturing processes in medicine,airplane,packaging and printing *** this work,a series of carbon nanotubes/polylactic acid(CNTs/PLA) composites were prepared through the combination of molten co-extrusion and 3D printing *** orientation and dispersion of CNTs in PLA matrix were investigated to explore the impact of 3D printing process on the morphology of CNTs/PLA composites via transmission electron microscopy,field emission scanning electron microscopy and Raman spectroscopy.X-ray diffractometer,differential scanning calorimetry,and thermal gravity analysis were employed to study the crystal structure and thermal properties of the *** addition,the electrical conductivity of the prepared specimen revealed that the orientation of CNTs in PLA might enhance the conductivity of the *** was found that 3D printing process was beneficial to increasing the purity of CNTs,electrical conductivity and mechanical properties of CNTs/PLA composites.

关键词： Carbon nanotubes Microstructure Polymer nanocomposites Thermal stability

Preparation and characterization of organic pigments and their fluorescence properties depending on bulk structure

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第11期34卷 2218-2224页

作者： Jie Du Rong Yang Changqing Fang Xing Zhou Shaofei Pan wanqing lei Jian Su Youliang Cheng Donghong Liu School of Mechanical and Precision Instrument Engineering Xi'an University of Technology Faculty of Printing Packaging Engineering and Digital Media TechnologyXi'an University of Technology Fuli Institute of Food Science Zhejiang University School of Materails Science and Engineering Xi'an University of Technology

Fluorescent pigments, based on the optical or electrooptical properties of dyes, are the main component in fluorescent coatings and inks. In this study, three kinds of dyes（Rhodamine B, Light Green SF Yellowish, Coumarin） with four different ratios（2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%） were employed as luminophor,and the melamine-formaldehyde（MF） resin was used as curing resin to prepare fluorescent pigments in different color. Fourier transform infrared spectroscopy and X-ray diffractometry were carried out to analyze the structure of the fluorescent pigments. Scanning electron microscopy and particle size distribution were used to present the morphology of fluorescent pigments. UV–vis and fluorescence spectrum were used to demonstrate the optical properties. It can be concluded that, coumarin pigments possessed consecutive structure in MF resin while rhodamine B might be the best for the preparation of printing inks among the three kinds of dyes from the view of particle size. The TG results presented that all the pigments showed good thermal stability, which might possess potential application in high speed printing industry.

关键词： Fluorescein Microstructures and properties Optical properties Thermal properties

Preparation and Characterization of Waterborne Polyurethane/Cellulose Nanocrystal Composite Membrane from Recycling Waste Paper

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2020年第6期8卷 631-645页

作者： Xing Zhou Xin Zhang Dong Wang Changqing Fang wanqing lei Zhigang Huang Yonghua Song Xinyu He Yingwei Huang Faculty of Printing Packaging Engineering and Digital Media TechnologyXi’an University of TechnologyXi’an710048China School of Materials Science and Mechanical Engineering Beijing Technology and Business UniversityBeijing100048China

Cellulose plays a key role in abundant organic natural materials meeting the increasing demand for green and biocompatible *** highly crystalline nanoscale component of cellulose nanocrystals has recently attracted great attention due to the versatile performance as filler or matrix in producing functional *** this work,we prepared the waterborne polyurethane via a prepolymer process,and obtained cellulose and cellulose nanocrystals from waste paper via a facile acid hydrolysis *** that,the cellulose nanocrystals were assembled into film and mixed with polyurethane to prepare flexible polyurethane/cellulose nanocrystals composite membrane with different soaking *** correlation between the bulk structure and applied properties including thermal resistance and mechanical property was investigated by using Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),thermogravimetric analysis(TGA),differential scanning calorimetry(DSC)and folding *** structure analysis indicates that cellulose nanocrystals prepared from used paper have a quality similar to that of commercial ***,the cellulose nanocrystals have been mixed with polyurethane *** can significantly benefit to the thermal resistance and mechanical property of the cellulose nanocrystals *** polyurethane/cellulose nanocrystals composite membrane present good flexibility and may hold a significantly potential application as visual and flexible material.

关键词： Cellulose waterborne polyurethane membrane recycling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

缠绕管式换热器换热管泄漏失效分析

压力容器 2019年第1期36卷 65-71,53页

作者：雷万庆张凯张建晓温宝峰兰州兰石检测技术有限公司兰州730314 甘肃省压力容器特种材料焊接重点实验室培育基地兰州730314 兰州兰石重型装备股份有限公司兰州730314

某石油化工厂对换热器管程进行打压试验时发现严重泄漏。采用化学成分分析、力学性能试验、金相检验、扫描电镜分析等方法,对换热器泄漏失效原因进行了分析。结果表明,管程、壳程介质中均含有S2-,Cl-,造成换热器下端管程内外壁的点腐蚀... 详细信息

某石油化工厂对换热器管程进行打压试验时发现严重泄漏。采用化学成分分析、力学性能试验、金相检验、扫描电镜分析等方法,对换热器泄漏失效原因进行了分析。结果表明,管程、壳程介质中均含有S2-,Cl-,造成换热器下端管程内外壁的点腐蚀;同时,缠绕管在应力和腐蚀介质的共同作用下,从内壁向外发生应力腐蚀开裂,最终导致换热器腐蚀泄漏而失效。

关键词：换热管泄漏失效分析