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Journal of Wuhan University of Technology(Materials Science) 2018年第5期33卷 1281-1287页

作者： ZHANG Ranran QIAN Jun YE Shuangli ZHOU Yihua ZHU Ziqiang school of printing and packing Wuhan University

Ag-Pt bimetallic nanoparticles decorated on MWCNTs/PANI nanocomposites have been synthesized by in-situ chemical oxidative polymerization and chemical co-reduction method. The Fourier transform infrared（FT-IR） spectroscopy, X-ray diffraction（XRD）, ultraviolet-visible（UV-vis） absorption spectroscopy, scanning electron microscopy（SEM） and transmission electron microscopy（TEM） were used to characterize the morphology and structure of the nanocomposites. It can be observed that the PANI was uniformly grown along the MWCNTs to form MWCNsT/PANI fiber-like nanocomposites with diameter about 60 nm, and the Ag-Pt binary nanoparticles were decorated onto MWCNTs/PANI with particle sizes around 6.8 nm. Cyclic voltammetry（CV） and electrochemical impedance spectroscopy（EIS） were used to characterize the electrochemical performance of the prepared electrode. The results demonstrated that the obtained MWCNTs/PANI/Ag-Pt electrode displayed a good electrochemical activity and fast electron transport, which has potential applications in biosensors and supercapacitors.

关键词： Ag-Pt bimetallic nanoparticles polyaniline multiwalled carbon nanotubes electrochemical properties

Effect of Preparation Temperature on the Aging Properties of Waste Polyethylene Modified Asphalt

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Journal of Materials Science & Technology 2015年第3期31卷 320-324页

作者： Changqing Fang Mengya Zhang Ruien Yu Xiaolong Liu school of printing and packing Engineering Xi'an University of Technology

In this study, waste polyethylene(WPE) was used as a modifier for base asphalt. In our previous studies,we have examined a variety of polymer modifiers for asphalt. By contrast, little research has focused on the preparation process, such as preparation time, preparation temperature and shear rate. The effect of preparation temperature on aging properties of WPE-modified asphalt was investigated in this work. The experimental materials were characterized by infrared spectroscopy(IR), thermo-gravimetric analysis(TG), and differential scanning calorimetry(DSC). The physical properties were determined by conducting asphalt penetration, softening point and ductility tests. The results show that increasing the preparation temperature results in an increased softening point of WPE-modified asphalt while decreased penetration and ductility. In addition, this variation was accentuated by aging the experimental materials. The modification process of WPE is a physical process. During the asphalt modification process, the WPE aged as the preparation temperature increased. The results revealed that 190 C is the most suitable preparation temperature, and the post aged asphalt demonstrated improved high temperature stability.

关键词： Waste plastics Characterization Temperature

Preparation and Properties of Asphalt Modified with a Composite Composed of Waste Package Poly(vinyl chloride) and Organic Montmorillonite

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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

Nanomaterials Applied in Asphalt Modification:A Review

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Journal of Materials Science & Technology 2013年第7期29卷 589-594页

作者： Changqing Fang Ruien Yu Shaolong Liu Yan Li College of printing and packing Engineering Xi'an University of Technology school of Mechanical and Precision Instrument Engineering Xi'an University of Technology

Nanotechnology has been gradually penetrated into the field of asphalt modification. Seemingly magic effects of nanomaterials have now been brought to improve the performance of asphalt. To demonstrate many of the prospective applications, researchers have conducted a series of positive and effective efforts dealing with the preparation of modified asphalt to demonstrate the mechanism of modification and the resultant improvement in performance. In this review, various nanomaterials used in asphalt modification are initially presented, followed by the methods employed to modify the asphalt with these materials and finally the effects of nanomaterials on the performance of base asphalt are presented and the modification mechanisms are discussed. Based on the current research results, the influence of preparation process parameters on the compatibility of every phase in the modified asphalt and the stability of the modified asphalt system are described. Finally, the development trend of the topic field is projected.

关键词： Nanomatcriais Asphalt Modification Composites Properties

3D printing of Tough Hydrogel Scaffolds with Functional Surface Structures for Tissue Regeneration

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Nano-Micro Letters 2025年第2期17卷 18-45页

作者： Ke Yao Gaoying Hong Ximin Yuan Weicheng Kong Pengcheng Xia Yuanrong Li Yuewei Chen Nian Liu Jing He Jue Shi Zihe Hu Yanyan Zhou Zhijian Xie Yong He State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Liangzhu Laboratory Zhejiang UniversityHangzhou 310027People’s Republic of China Key Laboratory of 3D printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Stomatology Hospital School of StomatologyZhejiang University School of MedicineHangzhou 310027People’s Republic of China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001People’s Republic of China Institute of Digital Medicine Nanjing First HospitalNanjing Medical UniversityNanjing 210006People’s Republic of China

Hydrogel scaffolds have numerous potential applications in the tissue engineering ***,tough hydrogel scaffolds implanted in vivo are seldom reported because it is difficult to balance biocompatibility and high mechanical *** by Chinese ramen,we propose a universal fabricating method(printing-P,training-T,cross-linking-C,PTC&PCT)for tough hydrogel scaffolds to fill this ***,3D printing fabricates a hydrogel scaffold with desired structures(P).Then,the scaffold could have extraordinarily high mechanical properties and functional surface structure by cycle mechanical training with salting-out assistance(T).Finally,the training results are fixed by photo-cross-linking processing(C).The tough gelatin hydrogel scaffolds exhibit excellent tensile strength of 6.66 MPa(622-fold untreated)and have excellent ***,this scaffold possesses functional surface structures from nanometer to micron to millimeter,which can efficiently induce directional cell ***,this strategy can produce bionic human tissue with mechanical properties of 10 kPa-10 MPa by changing the type of salt,and many hydrogels,such as gelatin and silk,could be improved with PTC or PCT *** experiments show that this scaffold can effectively promote the new generation of muscle fibers,blood vessels,and nerves within 4 weeks,prompting the rapid regeneration of large-volume muscle loss injuries.

关键词： 3D printing Tough hydrogel scaffold Functional surface structure Tissue regeneration Biomaterials

Synthesis and Characterization of Hydroxyl-terminated Block Fluorinated Copolyether(FPO-PTHF-FPO)

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Journal of Wuhan University of Technology(Materials Science) 2022年第2期37卷 285-291页

作者： LIU Yan LIU Huihui ZHANG Tao ZHU Qing LI Houbin school of printing and packing Wuhan UniversityWuhan 430072China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621000China

We introduced fluorine into hydroxyl-terminated block copolyether so as to prepare polyurethane adhesive with better ***-containing epoxy compounds(FO)was synthesized by one-step method from 2,2,3,3-tetrafluoro-1-propanol(TFP)and epichlorohydrin(ECH).Then,a novel hydroxyl-terminated block fluorinated copolyether(FPO-PTHF-FPO)was prepared by cationic ring-opening polymerization of fluorinated epoxy compound(FO)with polytetrahydrofuran(PTHF)as the macromolecular initiator and boron trifluoride diethyl ether(BF_(3)·OEt_(2))as the *** structure and properties of hydroxyl-terminated block fluorinated copolyether were characterized by FTIR,^(1)HNMR,GPC,DSC,TGA,and viscosity-temperature curve *** comparison with polytetrahydrofuran(PTHF),hydroxyl-terminated block fluorinated copolyether(FPO-PTHF-FPO)has lower viscosity and only one lower glass transition temperature(-66.6℃)on DSC *** addition,hydroxyl-terminated block fluorinated copolyether(FPO-PTHF-FPO)begins to decompose at 187.2℃and is completely decomposed until 431.6℃,which indicates that it has a good thermal stability.

关键词： polytetrahydrofuran fluoride-containing hydroxyl-terminated block copolyether cationic ring-opening polymerization

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

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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)

Preparation and Characterization of Waterborne Polyurethane with Unique Nanoparticles by Controlling Water

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Journal of Renewable Materials 2022年第6期10卷 1623-1639页

作者： Xing Zhou Faculty of printing Packing Engineering and Digital Media TechnologyXi’an University of TechnologyXi’an710048China

A facile method,focusing on emulsification,chain extension and dispersion process in preparing waterborne polyurethane,was developed to prepare emulsion with rod-like *** facile method involves a water addition procedure by in situ generated water to react with polyurethane prepolymer instead of the external water addition *** a comparison,waterborne polyurethane was synthesized through the external water addition *** to the characterization methods including FTIR,1H-NMR,TEM and water swelling experiments,it is suggested there are two kinds of hydrogen bonds interactions in hard/soft domain of the novel polyurethane,and the phase separation of hard/soft domains increases *** morphology of the two polyurethanes was quite different(nanorods and spherical particles,respectively),presenting a different surface *** addition,the water swelling of the novel polyurethane indicates that it holds significant potential application as degradable material.

关键词： Polyurethane nanoparticles coatings degradation swelling

Microstructure characterization and thermal properties of the waste-styrene-butadiene-rubber (WSBR)-modified petroleum-based mesophase asphalt

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Journal of Materials Science & Technology 2019年第5期35卷 852-857页

作者： Jingbo Hu Changqing Fang Shisheng Zhou Youliang Cheng Hanzhi Han 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 school of Information Technology and Equipment Engineering Xi'an University of Technology Xi'an 710048 China

In this work, waste-styrene-butadiene-rubber(WSBR)-modified petroleum-based mesophase asphalt was prepared through a co-carbonization process. The influence of contents of WSBR and carbonization temperature on the properties of mesophase asphalt was investigated. The chemical constituents,microstructure and thermal property of the samples were characterized. The results show that using WSBR as modifier can significantly promote the formation of mesophase. When the temperature is constant, the addition of WSBR results in more optically anisotropic crystal structure in the samples, and a better thermal stability. When the content of WSBR is invariable, with increasing temperature, the content of anisotropic structure in mesophase asphalt becomes higher and more uniform. The thermal stability of the samples is the best when WSBR content is 10 wt%.

关键词： Waste-styrene-butadiene-rubber Mesophase asphalt Thermal properties Microstructure

Fuzzy image restoration using modulation transfer function

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High Technology Letters 2016年第4期22卷 461-469页

作者：袁媛 Yi Yaohua Liu Juhua school of printing and Packaging Wuhan University

The key difficulty of restoring a fuzzy image is to estimate its point spread function( PSF). In the paper,PSF is modelled based on modulation transfer function( MTF). The first step is calculating the image MTF. In the traditional slanted-edge method,a sub-block is always manually extracted from original image and its MTF will be viewed as the result of the whole image. However,handcraft extraction is inefficient and will lead to inaccurate results. Given this,an automatic MTF computation algorithm is proposed,which extracts and screens out all the effective sub-blocks and calculates their average MTF as the final result. Then,a two-dimensional MTF restoration model is constructed by multiplying the horizontal and vertical MTF,and it is combined with conventional image restoration methods to restore fuzzy image. Experimental results indicate the proposed method implementes a fast and accurate MTF computation and the MTF model improves the performance of conventional restoration methods significantly.

关键词： fuzzy image modulation transfer function(MTF) slanted-edge method automatic computation MTF restoration model