检索结果-南通市图书馆

Chinese Journal of Polymer science 2023年第8期41卷 1261-1268,I0009页

作者： Jia-Qiang Li Wen-Shuang Li Wen-Ting Zhang Shu Zhu Chu-Yang Luo Wan-Shuang Liu Li-Ying Zhang shanghai co.laborative Innovation Center of High Performance Fibers and co.posite(Province-Ministry Joint) Center for Civil Aviation CompositesDonghua UniversityShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China shanghai Donghua composites Technology co.Ltd. Shanghai 201620China Key Laboratory of Textile science&Technology College of TextilesDonghua UniversityShanghai 201620China

Thermoplastic polyimides(PIs)with shape memory potential have received growing attention in recent *** this work,highperformance thermoplastic PIs were fabricated by introducing PIs with chain rigidity(r-PI)into PI with chain flexibility(f-PI).The influences of molecular chain entanglement andπ-πinteractions on their thermomechanical and shape memory properties were *** degree of molecular chain entanglement was quantitively characterized based on dynamic mechanical analysis(DMA).Theπ-πinteractions were investigated in detail by X-ray diffraction(XRD)and UV-Vis *** was found that the entanglement density increased andπ-πinteractions became stronger with the introduction of r-PI into f-PI,leading to the improvement of shape ***,a broad and increased glass transition temperature(T_(g))was achieved,endowing the PIs with multiple shape memory *** synergistic effects of increased entanglement density and enhancedπ-πinteractions were beneficial to regulating interchain interactions and thereby achieving high shape memory performance of the PIs.

关键词： Shape memory polyimide Molecular chain entanglement r-r Stacking

A simple atomization approach enables monolayer dispersion of nano graphenes in cementitious composites with excellent strength gains

在线全文

学校读者我要写书评

暂无评论

Nano Materials science 2024年第2期6卷 211-222页

作者： Nanxi Dang Rijiao Yang Chengji Xu Yu Peng Qiang Zeng Weijian Zhao Zhidong Zhang co.lege of Civil Engineering and Architecture Zhejiang University310058HangzhouChina Center for Balance Architecture Zhejiang UniversityHangzhou310028China The Architectural Design&Research Institute of Zhejiang University co. LtdHangzhou310063China Institute for Building Materials ETH Zurich8093ZurichSwitzerland

Carbon nano additives(CNAs)are critical to achieving the unique properties of functionalized composites,however,co.trolling the dispersion of CNAs in material matrix is always a challenging *** this study,a simple atomization approach was successfully developed to promote the dispersion efficiency of graphene nanoplatelets(GNPs)in cement *** atomization approach can be integrated with the direct,indirect and co.bined ultrasonic stirrings in a homemade automatic stirring-atomization *** and microstructure tests were performed on hardened cement pastes blended with GNPs in different stirring and mixing *** show that the direct ultrasonic stirrings enabled more homogeneous dispersions of GNP particles with a smaller size for a longer *** atomized droplets with the mean size of~100μm largely mitigated GNPs’*** GNPs were observed in the cement matrix with the strength gain by up to 54%,and the total porosity decrease by 21%in 0.3 wt%GNPs *** greatly enhanced dispersion efficiency of GNPs in cement also raised the cement *** work provides an effective and manpower saving technique toward dispersing CNAs in engineering materials with great industrialization prospects.

关键词： Nanomaterials Dispersion Atomization Strength Microstructure

Revealing the GHG reduction potential of emerging biomass-based co.(2) utilization with an iron cycle system

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental science & Engineering 2023年第10期17卷 119-131页

作者： Jing Xu Jiong Cheng Runtian He Jiaqi Lu Chunling Wang Heng Zhong Fangming Jin School of Environmental science and Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China Innovation Centre for Environment and Resources Shanghai University of Engineering ScienceShanghai 201620China Center of Hydrogen science Shanghai Jiao Tong UniversityShanghai 200240China shanghai Institute of Pollution co.trol and Eco.ogical Security Shanghai 200092China

co.(2) utilization beco.es a promising solution for reducing anthropogenic greenhouse gas (GHG) emissions. Biomass-based co.(2) utilization (BCU) even has the potential to generate negative emissions, but the co.responding quantitative evaluation is limited. Herein, the biomass-based co.(2) utilization with an iron cycle (BCU-Fe) system, which co.verts co.(2) into formate by Fe under hydrothermal co.ditions and reco.ers Fe with biomass-derived glycerin, was investigated. The GHG reduction potential under various process designs was quantified by a multidisciplinary method, including experiments, simulations, and an ex-ante life-cycle assessment. The results reveal that the BCU-Fe system co.ld bring co.siderable GHG emission reduction. Significantly, the lowest value is −34.03 kg co.(2)-eq/kg absorbed co.(2) (−2.44 kg co.(2)-eq/kg circulated Fe) with the optimal yield of formate (66%) and Fe (80%). The proposed ex-ante evaluation approach not only reveals the benefits of mitigating climate change by applying the BCU-Fe system, but also serves as a generic tool to guide the industrialization of emerging carbon-neutral technologies.

关键词： Carbon dioxide utilization Hydrothermal reactions Biomass-based co.(2)reduction Simulation Ex-ante LCA

Development of Gelatin-Based Active Packaging and Its Application in Bread Preservation

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第10期11卷 3693-3709页

作者： Hui Zheng Xiaohan Chen Li Li Dawei Qi Jiale Wang Jiaying Lou Wenjun Wang shanghai Tobacco.Group co. Ltd.Shanghai200082China co.lege of Food science and Technology Shanghai Ocean UniversityShanghai201306China

The issue of plastic pollution has attracted widespread social *** is valued as a degradable bio-based material,especially as an edible active packaging ***,the co.monly used solution-casting filmforming technology limits the mass production of gelatin *** order to improve the production efficiency and enhance the co.mercial value of gelatin films,in this study,fish gelatin(FG)particles were successfully blended with essential oils(EOs)to prepare active films by melt extrusion technique,a co.mon method for co.mercial plastics,and applied to bread *** and EOs showed good co.patibility with each *** elongation at break was enhanced in all samples of films co.taining *** addition of EOs weakened the oxygen barrier properties of the FG *** gelatin films co.taining clove EO showed the highest DPPH radical scavenging rate of 39.38%.The films co.taining oregano EO showed the highest antibacterial activity,with 98.84%and 99.86% against *** and ***,*** bread preservation results showed a slower microbial growth rate in the samples preserved by the active *** bread samples preserved in co.mercial PE film showed mold on day 3,and the bread samples preserved in active gelatin film showed mold visible to the naked eye by day *** study demonstrates the potential of gelatin-based activated films for co.mercial application in baked goods preservation.

关键词： Fish gelatin film essential oils melt extrusion bread preservation

co.petitive role of film-like austenite and transition carbides on hydrogen embrittlement resistance and impact toughness in bainite-co.taining quenched and partitioned steel

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

Journal of Iron and Steel Research(International) 2023年第4期30卷 782-794页

作者： Kai Yang Yi Luo Wei Li Li Wang Zhong-qu Sun Jun-liang Liu Xue-jun Jin Bao Steel-SJTU Joint Research Center of Future Steels School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Development and Application Technology of Automotive Steels(Bao Steel) Research Institute(R&D Center)Baoshan Iron&Steel Co.Ltd.Shanghai 200240China

A microstructure co.posed of martensite matrix,lower bainite,and stable film-like austenite was designed by a quenching and isothermal bainitic holding process in a 0.30C–2.69Mn–1.71Si(wt.%)*** yield strength,tensile strength,and ductile-to-brittle transition temperature(DBTT)of the high-strength steel thus obtained were 1263 MPa,1521 MPa,and-33℃,respectively,and at-20℃,it showed superior low-temperature toughness,which reached 77.5 J/cm^(2).Meanwhile,it showed excellent hydrogen embrittlement(HE)resistance,and the total elongation loss is only 3.1%after 15 min of hydrogen *** excellent co.prehensive performance is attributed to the fact that fine stable austenite with film-like morphology hindered the crack nucleation and propagation,and hindered hydrogen diffusion as a hydrogen ***,with a decrease in the isothermal temperature,transition carbide precipitation was acco.panied by a further decrease in austenite grain *** this co.dition,although transition carbides can act as effective hydrogen traps,excessive precipitation decreased the carbon co.tent of retained austenite and increased the deformation heterogeneity between austenite and martensite matrix,leading to weakened austenite stability and HE resistance,a total elongation loss of approximately 39%(15 min hydrogen charging),a sharp decrease in impact toughness,and an increase in *** co.petitive role of film-like austenite and transition carbides on the co.prehensive mechanical performance of steel is revealed,especially the suppression of crack nucleation and propagation that will provide a guide for the design of high strength steels with excellent impact toughness and HE resistance.

关键词： Quenched and partitioned steel Isothermal bainite transformation Transition carbide Hydrogen embrittlement Impact toughness

酶诱导碳酸钙沉淀(EICP)固化砂土酸蚀宏细观机理

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

Journal of Central South University 2024年第2期31卷 636-648页

作者：杨昕颜梦秋郑嘉男 co.lege of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China Ocean Academy Zhejiang UniversityZhoushan 316021China shanghai Institute for Advanced Study Zhejiang UniversityShanghai 201203China

二氧化碳地质封存是控制二氧化碳排放的有效措施,因此二氧化碳注入后地质安全问题备受关注。当前,酶诱导碳酸钙沉淀(EICP)技术能够有效地解决二氧化碳泄露问题。二氧化碳注入后储层流体呈酸性,对胶结物碳酸钙具有酸蚀作用。因此,亟需对E... 详细信息

二氧化碳地质封存是控制二氧化碳排放的有效措施,因此二氧化碳注入后地质安全问题备受关注。当前,酶诱导碳酸钙沉淀(EICP)技术能够有效地解决二氧化碳泄露问题。二氧化碳注入后储层流体呈酸性,对胶结物碳酸钙具有酸蚀作用。因此,亟需对EICP固化砂土耐酸蚀性开展试验研究。本研究将EICP试样浸泡在不同浓度酸溶液中,通过质量损失、表观分析、无侧限抗压强度、SEM和XCT等对其力学强度和宏细观结构进行了研究。结果表明:酸溶液对EICP试样的腐蚀作用随着溶液pH的降低明显增强,并且碳酸钙胶结物酸蚀导致试样结构破坏,试样外层逐渐脱落,从而使试样无侧限抗压强度近似线性下降。同时,酸蚀反应后EICP试样出现大量粒间孔隙。本研究揭示了EICP试样酸蚀演化机理,为EICP耐腐蚀性提供参考。

关键词： EICP 酸腐蚀碳酸钙胶结孔隙结构

Effects of V addition on the mechanical properties at elevated temperatures in a γ”-strengthened Nico.r-based multi-co.ponent alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2022年第12期107卷 290-300页

作者： Yunwei Pan Anping Dong Yang Zhou Dafan Du Donghong Wang Guoliang Zhu Baode Sun shanghai Key Lab of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix composites Shanghai Jiao Tong UniversityShanghai 200240China

Ni co.Cr-based multi-co.ponent alloys have drawn much attention due to their exceptional ductility and strain hardening ***,insufficient strength-ductility synergy of Nico.r alloy has always been an issue that prevents it from extensive *** to our previous research,the precipitation ofγ”phase can significantly improve the strength-ductility synergy of this alloy system at room *** this study,the effects of V addition onγ”phase stability and high-temperature mechanical properties have been explicitly *** results indicate that V addition can stabilize the metastableγ”phase in this alloy system and prevent it from transforming into a stableδphase at grain boundaries upon 650℃aging,resulting in improved mechanical properties at elevated *** specific strength ofγ”-strengthened multi-co.ponent Nico.r-based alloy can reach up to 86.2 MPa gcmat 650℃,which is higher than those of Ni-based superalloys,IN 939 and *** work provides theoretical guidance for the novel design of γ”-strengthened alloy for high-temperature applications.

关键词： Multi-co.ponent alloys CALPHAD γ”phase Microstructural evolution High-temperature mechanical properties

A hot tearing criterion based on solidifcation microstructure in cast alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2022年第10期105卷 68-80页

作者： Bo Hu Zixin Li Dejiang Li Tao Ying Xiaoqin Zeng Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China The State Key Laboratory of Metal Matrix composites Shanghai Jiao Tong UniversityShanghai 200240China

A criterion based on solidifcation microstructure was proposed to precisely predict the hot tearing behavior of cast alloys,which takes into acco.nt the effects of both mechanical and nonmechanical *** criterion focuses on the events occurring at the grain boundary,which are determined by the thermal co.traction,solidifcation shrinkage,grain growing and liquid *** criterion responds to a series of factors that affect hot tearing,such as alloy co.position,mold design,casting process and *** credibility has been validated by studying the hot tearing behavior of Mg-Ce *** co.formity with the experimental results,this criterion predicted decrease in the number of rods occurring hot tearing with increasing cerium co.tent.A simplifed criterion was derived and validated by Mg-Ce(equiaxed grain)and Mg-Al(co.umnar grain)alloy systems,which is suitable for the case where the eutectic liquid fraction is low and the liquid feeding can be *** addition,a hot tearing index for equiaxed grains was proposed,that is,|d T/d(f_(s)^(1/3)near(f_(s))^(1/3)=1,and its prediction results were co.sistent with the hot tearing susceptibility calculated from the experimental results.

关键词： Hot tearing Microstructure Magnesium alloys Casting Criterion

Photocatalytic degradation of tetracycline hydrochloride with visible light-responsive bismuth tungstate/co.jugated microporous polymer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第1期35卷 488-496页

作者： Fenghongkang Pan Yimeng Wang Kaiqing Zhao Jun Hu Honglai Liu Ying Hu State Key Laboratory of Chemical Engineering and School of Chemistry&Molecular Engineering East China University of Science and TechnologyShanghai 200237China Prinbury Biopharm co. LtdShanghai 201203China

co.jugated microporous polymer(CMP)is an emerging organic semico.ductor withπ-co.jugated skeletons,and the bandgap of CMP can be flexibly modulated to harvest visible *** on the diversity and adjustability of monomers in CMP,we designed and synthesized donor-accepter(D-A)type BTNCMP through Sonogashira-Hagihara cross-co.pling polymerization,further in-situ co.structing series of inorganic/organic Z-scheme BW/BTN-n co.posite in the presence of Bi_(2)WO_(6).After optimization,the tetracycline hydrochloride(C0=10 mg·L^(-1))degradation efficiency reached 84%with BW/BTN-2 as catalyst in 90 min under visible light irradiation,the apparent rate co.stant k1 is 0.017 min^(-1),which is 1.7 and 5.7 times higher than bare Bi_(2)WO_(6) and BTN-CMP.X-ray photoelectron spectra and UV-Vis diffuse spectra showed that the enhanced photocatalytic activity originated from the tight heterojunction between Bi_(2)WO_(6) and BTN-CMP,which can extend the light absorption range and facilitate the separation and transport of photogenerated charges in the interface of *** active species trapping experiments and electron spin resonance technique revealed that h+was the dominant active species during the photodegradation process of tetracycline hydrochloride(TCH).The present study demonstrated the feasibility to co.struct inorganic/organic co.posite for the photocatalytic degradation of environmental pollutants.

关键词： Photochemistry Degradation Visible light response Pollution Inorganic/organic heterojunction co.posite

Block co.olymer Networks co.posed of Poly(ε-caprolactone) and Polyethylene with Triple Shape Memory Properties

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer science 2022年第2期40卷 185-196页

作者： Honggang Mei Bingjie Zhao Yuan Gao Lei Li Liyue Liu Sixun Zheng co.lege of Chemistry and Chemical Engineering and the State Key Laboratory of Metal Matrix composites Shanghai Jiao Tong UniversityShanghai 200240China

In this co.tribution, we reported a novel synthesis of block co.olymer networks co.posed of poly(ε-caprolactone)(PCL) and polyethylene(PE) via the co.hydrolysis and co.densation of α,ω-ditriethoxylsilane-terminated PCL and PE telechelics. First, α,ω-dihydroxylterminated PCL and PE telechelics were synthesized via the ring-opening polymerization of ε-caprolactone and the ring-opening metathesis polymerization of cyclooctene followed by hydrogenation of polycyclooctene. Both α,ω-ditriethoxylsilane-terminated PCL and PE telechelics were obtained via in situ reaction of α,ω-dihydroxyl-terminated PCL and PE telechelics with 3-isocyanatopropyltriethoxysilane. The formation of networks was evidenced by the solubility and rheological tests. It was found that the block co.olymer networks were microphase-separated. The PCL and PE blocks still preserved the crystallinity. Owing to the formation of crosslinked networks, the materials displayed shape memory properties. More importantly, the co.bination of PCL with PE resulted that the block co.olymer networks had the triple shape memory properties, which can be triggered with the melting and crystallization of PCL and PE blocks. The results reported in this work demonstrated that triple shape memory polymers co.ld be prepared via the formation of block co.olymer networks.

关键词： Poly(ε-caprolactone) Polyethylene Block co.olymer networks Triple shape memory properties