检索结果-南通市图书馆

Progress in Natural Science:materials International 2011年第6期21卷 478-484页

作者： hou-yong yu~(1,2),zong-yi qin~1,zhe zhou~2 1.state key laboratory for modification of chemical fibers and polymer materials, donghua university,shanghai 201620,china 2.College of Material Science and Engineering,donghua university,shanghai 201620,china [a] state key laboratory for modification of chemical fibers and polymer materials Donghua University Shanghai 201620 China [b] College of Material Science and Engineering Donghua University Shanghai 201620 China

The green nanocomposites of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV) with various cellulose nanocrystals (CNCs) contents were prepared by solution casting *** effects of CNCs on the crystallization behavior,spherulitic morphology,crystal structure and hydrophilic property of PHBV were studied by differential scanning calorimeter(DSC),polarized optical microscope(POM),wide-angle X-ray diffraction(WAXD) and static water contact angle *** is found that the CNCs act as an effective nucleation agent for crystallization of PHBV,inducing an increase in the melt crystallization temperature of the nanocomposites.A study of the non-isothermal crystallization kinetics further illustrated that overall crystallization rate of PHBV in the nanocomposites was faster than that of neat PHBV,but exhibited a decrease in the crystallinity and the spherulite size of PHBV. Furthermore,the contact angle decreased from 60.1°for neat PHBV to 32.5°for the nanocomposites with 10%CNCs(mass fraction).

关键词： nanocomposites poly(3-hydroxybutyrate-co-3-hydroxyvalerate) cellulose nanocrystals crystallization behavior hydrophilic property

Size-controlled and large-scale synthesis of organic-soluble Ag nanocrystals in water and their formation mechanism

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:materials International 2011年第6期21卷 447-454页

作者： yu-yuan SHI,Bin SUN,zhe zhou,yong-tao WU,Mei-fang ZHU state key laboratory for modification of chemical fibers and polymer materials, College of Material Science and Engineering,donghua university,shanghai 201620,china state key laboratory for modification of chemical fibers and polymer materials College of Material Science and Engineering Donghua University Shanghai 201620 China

Organic-soluble Ag nanocrystals(NCs) with tunable sizes in the range from 5.4 to 22.1 nm were synthesized by a facile, reproducible and easily scaled up route using water as solvent in the presence of oleic acid and an *** synthetic Ag NCs exhibits excellent hydrophobicity and can be well re-dispersed in various non- or weak-polar *** tunable sizes of the Ag NCs were achieved by simply adjusting the initial precursor ***-scale synthesis of the Ag NCs was realized at a high AgNO3concentration(0.4 mol/L).As much as 16.2 g highly uniform organic-soluble Ag NCs with 5 nm average diameter can be readily synthesized at low cost in a single reaction only using 400 mL water as solvent,which is adaptable to the industrial scale *** structure of the obtained Ag NCs was investigated in detail by X-ray diffractometry,transmission electron microscopy,Fourier transform infrared and thermal gravimetric analysis *** results reveal that the surface of the organic-soluble Ag NCs is coated with the monolayer surfactants consisting of oleic acid and the *** addition,on the basis of the sufficient evidences,a proposed mechanism based on the "bilayer surfactant-controlled reaction" successfully demonstrates the formation of high quality organic-soluble Ag NCs in the aqueous solution.

关键词： organic-soluble Ag nanocrystals large-scale size-controlled synthesis formation mechanism

Advanced cellulose-based materials toward stabilizing zinc anodes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Chemistry 2024年第5期67卷 1465-1484页

作者： Zhijiang Li Xiang Chen Rui Zhang Taoyi Shen Jianchao Sun Zhongce Hu Lin Li Lanlan Yang hou-yong yu College of Textile Science and Engineering(International Institute of Silk) Zhejiang Sci-Tech UniversityHangzhou 310018China state key laboratory for modification of chemical fibers and polymer materials Donghua UniversityShanghai 201620China School of Environment and Material Engineering Yantai UniversityYantai 264005China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Rechargeable aqueous zinc metal batteries(RAZMBs) have received extensive attention for large-scale energy storage systems due to the merits of Zn anodes, including moderate volumetric and gravimetric energy density, low redox potential, abundant reserve, low cost and impressive intrinsic safety. However, Zn anodes suffer from a series of adverse reactions(dendrite growth,hydrogen evolution, and surface passivation) resulting in low Coulombic efficiency, large polarization, and unsatisfied cycling performance, which inevitably hinder the wide application of RAZMBs. To address the above issues, cellulose-based materials are widely used for Zn anode protection because of their unique physical and chemical properties and other advantages such as biocompatibility, non-toxicity, degradability and easy extraction. In order to better understand the current progress in cellulosebased materials for the Zn anode protection, we have classified and summarized the relevant literatures. In this review, we summarize and elaborate the causes of poor reversibility for Zn anodes, including dendrite formation, hydrogen evolution, and surface passivation. Subsequently, the effective strategies(anode interfacial engineering, gel electrolyte optimization, and separator modification) of cellulose-based materials toward stabilizing Zn anodes are overviewed. In the end, the existing challenges and prospects of cellulose-based materials in Zn anode protection are summarized to shed light on future work.

关键词： Zn anode cellulose anode interfacial engineering gel electrolyte optimization separator modification

半纤维素对玉米秸秆皮Lyocell纤维性能的影响

在线全文

学校读者我要写书评

暂无评论

合成纤维 2024年第1期53卷 26-30页

作者：马圣东侯哲生邹红亮张玉梅马云海吉林化工学院吉林吉林132022 吉林省秸秆原料化工程研究中心吉林吉林132022 东华大学材料科学与工程学院纤维材料改性国家重点试验室上海201620 吉林大学生物与农业工程学院吉林长春130025

探讨了半纤维素对Lyocell纤维制备时溶浆过程以及纺丝过程的影响,研究了半纤维素对Lyocell纤维的力学、抗原纤化和染色等性能的影响。试验可知:使用市售质量分数50%的NMMO溶剂在90℃温度下即可完全溶解玉米秸秆皮浆粕;半纤维素含量较高... 详细信息

探讨了半纤维素对Lyocell纤维制备时溶浆过程以及纺丝过程的影响,研究了半纤维素对Lyocell纤维的力学、抗原纤化和染色等性能的影响。试验可知:使用市售质量分数50%的NMMO溶剂在90℃温度下即可完全溶解玉米秸秆皮浆粕;半纤维素含量较高的玉米秸秆皮浆粕的流动性更好,制成的Lyocell纤维的染色性能和抗原纤化性能更好,断裂伸长率较大,结晶度较小。

关键词：半纤维素玉米秸秆皮浆粕 Lyocell纤维性能

Progress of Fabrication and Applications of Electrospun Hierarchically Porous Nanofibers

在线全文

学校读者我要写书评

暂无评论

Advanced Fiber materials 2022年第4期4卷 604-630页

作者： Ranran Liu Lanlan hou Guichu yue Huaike Li Jiesan Zhang Jing Liu Beibei Miao Nü Wang Jie Bai Zhimin Cui Tianxi Liu yong Zhao key laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191People’s Republic of China state key laboratory for modification of chemical fibers and polymer materials Donghua UniversityShanghai 201620People’s Republic of China Inner Mongolia key laboratory of Industrial Catalysis Chemical Engineering CollegeInner Mongolia University of TechnologyHohhot 010051People’s Republic of China

In recent years,electrospun nanofibers have attracted great attention for their facile adjustable structure,morphology feature and chemical ***,significant interest has been devoted to the development of electrospun nanofibers with multiscale pores from micropores and mesopores to macropores,owing to their large specific surface area,hierarchical pore structures,abundant active sites and many other unique properties and *** review presents an overview on the design strategies,preparation methods,physical properties and applications of electrospun hierarchical porous *** first,electrospinning fabrication of nanofibers with different types of pores including micropores,mesopores,macropores and hierarchical pores are *** the structures,properties of electrospun porous nanofibers and their applications in several important areas,such as catalysis,energy storage,adsorption and separation,heat insulation and flame retardant,sound absorption and wave absorption,sensor and biomedical are *** last,challenges and potential opportunities of electrospun porous nanofibers in the future are highlighted.

关键词： Electrospinning Porous nanofibers Hierarchical structure Catalysis Energy storage

加压氧化对抑制中间相沥青纤维氧化粘连并丝的影响

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

合成纤维 2021年第6期50卷 23-29页

作者：孙祝林吕永根尉言哲杨常玲东华大学材料科学与工程学院纤维材料改性国家重点实验室上海201620 东华大学化学化工与生物工程学院上海201620

为了解决中间相沥青纤维氧化稳定化过程中由于纤维表面发生小分子挥发以及低分子质量组分软化导致的粘连并丝问题,采用加压空气和加压氧气对中间相沥青纤维进行氧化稳定化热处理,研究氧气分压和氧化气体的总压力对沥青纤维氧化粘连的影... 详细信息

为了解决中间相沥青纤维氧化稳定化过程中由于纤维表面发生小分子挥发以及低分子质量组分软化导致的粘连并丝问题,采用加压空气和加压氧气对中间相沥青纤维进行氧化稳定化热处理,研究氧气分压和氧化气体的总压力对沥青纤维氧化粘连的影响。利用悬垂度的测试表征氧化沥青纤维的粘连程度,悬垂度越大说明纤维粘连程度越小。结果表明:空气中压力由0.10 MPa增至2.60 MPa时,氧化沥青纤维束的悬垂度由6%增加到82%;纯氧气氛下压力从0.40 MPa提高到0.60 MPa时,纤维束的悬垂度从42%提高到68%。分析表明,氧分压的提高起到抑制粘连的主要作用,而在相同氧分压下,总压提高也有利于降低粘连。另外加压氧化的方式有效地提升了氧化沥青纤维的均匀性。

关键词：中间相沥青纤维氧化稳定化粘连并丝悬垂度

在线全文

学校读者我要写书评

暂无评论

落球法在线测量热聚合过程中沥青熔体的黏度

合成纤维 2022年第8期51卷 44-48,64页

作者：尉言哲吕永根韩磊程习松陈涛杨常玲东华大学材料科学与工程学院纤维材料改性国家重点实验室上海201620 东华大学化学化工与生物工程学院上海201620

中间相沥青基碳纤维具有超高模量和热导率。由于沥青在热聚合过程中前期反应很慢而后期自加速效应明显,所以难以控制最终产物的黏度。根据落球黏度测试原理,利用丝球连接与滑轮组配合,通过测量小球下落速度结合数值分析方法,实现了沥青... 详细信息

中间相沥青基碳纤维具有超高模量和热导率。由于沥青在热聚合过程中前期反应很慢而后期自加速效应明显,所以难以控制最终产物的黏度。根据落球黏度测试原理,利用丝球连接与滑轮组配合,通过测量小球下落速度结合数值分析方法,实现了沥青熔体在聚合过程中的在线黏度测量。试验结果表明:在线黏度测量方法准确可靠;在搅拌全返混聚合过程中,随着反应时间延长,沥青黏度不断增大且反应后期存在自加速现象;在非搅拌聚合过程中,竖直方向由上到下沥青黏度逐渐增大,且增长速度加快。

关键词：中间相沥青热聚合在线黏度落球法