检索结果-南通市图书馆

Journal of Beijing Institute of Technology 2018年第1期27卷 155-160页

作者： Jian Wang Ziran Du Tong Lian jiong peng School of Chemistry and Chemical Engineering Beijing Institute of Technology

Extrusion-calendering method was developed to prepare single-polymer composites（SPCs） of ultrahigh molecular weight polyethylene（ UHMWPE） fabric reinforcing low density polyethylene（LDPE）.Differential scanning calorimeter（DSC） experiments were executed to determine the setup of extrusion *** of the die temperature on the tensile and interfacial performances of SPCs were studied through the tensile and T-peel tests,respectively. The results showed that both tensile strength and modulus increased initially and decreased afterwards as the temperature increased. The peak values of tensile strength and modulus of PE SPCs,which are 10. 8 and 3. 5 times as high as those of the unreinforced LDPE respectively,were obtained at 150 ℃. Higher temperatures also give a positive effect on peel strength. Scanning electron microscopy（ SEM） and camera were also used to observe the morphology of the SPCs samples.

关键词： extrusion-calendering single-polymer composites(SPCs) tensile performances peel strength morphology

Fast charge transport motivated by tunable Mo2C/Mo2N high-quality heterointerface for superior pseudocapacitive storage

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第8期83卷 465-477,I0012页

作者： Yanjun Gao Shaohua Zhang Lingrui Xu Xiangyang Li Lijie Li Lixia Bao jiong peng Xin Li School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China School of Material Science and Engineering Beijing Institute of TechnologyBeijing 100081China Analysis&Testing Center Beijing Institute of TechnologyBeijing 100081China

The development of potential transition-metal carbide/nitride heterojunctions is hindered by overall understanding and precise modulation for heterointerface ***,we demonstrate that Mo_(2)C/Mo_(2)N heterojunction with the precisely regulated high-quality interface can achieve marvelous rate performance and energy output via enlarging the interface-effect range and maximizing "accelerated charge" amount The heterointerface mechanism improving properties is synergistically revealed from kinetics and thermodynamics *** analysis confirms that the self-built electric field affords a robust force to drive rapid interface electrons/ions *** small adsorption energy,high density of states and quite low diffusion barrier thermodynamically enhance the electrochemical reaction dynamics on ***,the almost optimal performance of ultrahigh capacitance retention(85.6% even at 10 A g^(-1)) and pronounced energy output(96.4 Wh kg^(-1))in hybridsupercapacitors than other Mo_(2)C/Mo_(2)N-based materials is *** work gives new insight into the energy storage mechanism of heterojunction and guides the design of advanced electrodes.

关键词： Energy storage Hybrid supercapacitors Pseudocapacitance Heterojunction High-quality interface

A Unique 2D Layered FeⅢ Coordination Polymer with only Formate Ligand as Bridges: Synthesis, Crystal Structure and Magnetic Properties

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2019年第11期38卷 1963-1969页

作者： ZHANG Lin-Lin SHEN Bin ZHAO jiong-peng GAO Su-Hua LIU Fu-Chen School of Chemistry and Chemical Engineering Tianjin University of Technology

A novel two-dimensional layered FeⅢ formate, Fe(HCO2)2ClH2O, has been synthesized by solvothermal reaction. The structure of complex is characterized by single-crystal X-ray diffraction. The complex crystallizes in tetragonal space group P4/nmm with a = 5.9588(6), c = 8.3831(17) ?, V = 297.66(7) ?3, Z = 2, F(000) = 198, Dc = 2.224 g/cm3, Mr = 199.35, μ = 2.927 mm-1, the final R = 0.0231 and w R = 0.0585(I > 2σ(I)) for all data. Single-crystal structure analysis indicates that the complex has a 2D metal formate structure with only formate anions as bridges. The anti-anti formats link the FeⅢ ions to form a(4, 4) net, while the chlorine ions and water molecules coordinate to FeⅢ on both sides of the layer. Magnetic study have shown that an antiferromagnetic interactions between the FeⅢ ions in the complex. And a field induced spin-flop was detected at low temperature.

关键词： formate solvothermal reaction low-dimensional materials antiferromagnetism

聚丙烯单聚合物复合材料嵌件式注射成型过程的数值模拟

在线全文

学校读者我要写书评

暂无评论

高分子材料科学与工程 2016年第9期32卷 108-112,118页

作者：王建姜南南彭炯北京理工大学化上与环境学院北京100081

单聚合物复合材料(SPC)是基体和增强体来自同种聚合物的复合材料,具有密度小、界面粘接性好和回收成本低等优点。嵌件式注射成型可实现SPC的快速制备。为了检验加工温度窗口的大小,掌握型腔内部温度分布情况,文中使用Moldex3D软件模拟... 详细信息

单聚合物复合材料(SPC)是基体和增强体来自同种聚合物的复合材料,具有密度小、界面粘接性好和回收成本低等优点。嵌件式注射成型可实现SPC的快速制备。为了检验加工温度窗口的大小,掌握型腔内部温度分布情况,文中使用Moldex3D软件模拟分析了聚丙烯单聚合物复合材料(PP SPC)嵌件式注射成型过程,比较了PP SPC嵌件式注射成型与PP注射成型的模拟结果,讨论了温度、黏度和翘曲变形情况。将不同熔融温度下数值计算得到的温度分布结果与实验样品照片进行了对比分析。研究结果表明,在180℃条件下嵌件式注射成型PP SPC,纤维不会熔融而能保持增强效果。

关键词：关键词:单聚合物复合材料聚丙烯嵌件式注射成型数值模拟

UHMWPE纤维增强LDPE复合材料的界面形态研究

在线全文

学校读者我要写书评

暂无评论

材料科学与工艺 2017年第1期25卷 92-96页

作者：王遂彭炯王建北京理工大学化工与环境学院北京100081

为实现聚乙烯单聚合物复合材料(PE SPC)的嵌件注射成型,研究基体与增强体间的界面非常关键.本文采用超高分子量聚乙烯(UHMWPE)纤维增强低密度聚乙烯(LDPE)基体,对纤维和基体进行了差示扫描量热仪测试,在偏光显微镜下模拟了基体与纤维的... 详细信息

为实现聚乙烯单聚合物复合材料(PE SPC)的嵌件注射成型,研究基体与增强体间的界面非常关键.本文采用超高分子量聚乙烯(UHMWPE)纤维增强低密度聚乙烯(LDPE)基体,对纤维和基体进行了差示扫描量热仪测试,在偏光显微镜下模拟了基体与纤维的复合过程,研究不同因素对复合材料界面结晶形态的影响.根据DSC确定了UHMWPE和LDPE复合的温度范围在110.98~147.14℃;合适的温度和剪切作用都有利于界面横晶的产生,从而使基体和纤维产生更好的粘结,提高复合材料的力学性能;温度比剪切的影响更大,注射温度设置在125~135℃可在保证纤维与基体复合的情况下不破坏纤维的增强作用;纤维丝之间会相互影响界面结晶形态,部分界面有横晶产生,说明在实际注射成型过程中纤维束或纤维布的结构对基体渗透和界面形成有较大影响.

关键词：超高分子量聚乙烯低密度聚乙烯单聚合物复合材料界面嵌件式注射成型

在线全文

学校读者我要写书评

暂无评论

销钉机筒挤出机混合段的混合性能

北京理工大学学报 2008年第1期28卷 90-94页

作者：陈晋南姚慧彭炯北京理工大学化工与环境学院北京100081

使用有限元法数值模拟有销钉和无销钉混合段流道内胶料的三维等温流场,用粒子示踪分析方法比较两者的混合性能.研究结果表明,有销钉混合段流道内,销钉局部打乱了胶料的运动轨迹,打散了滞留熔体,6个销钉所在横截面的流场被分成6个区域.... 详细信息

使用有限元法数值模拟有销钉和无销钉混合段流道内胶料的三维等温流场,用粒子示踪分析方法比较两者的混合性能.研究结果表明,有销钉混合段流道内,销钉局部打乱了胶料的运动轨迹,打散了滞留熔体,6个销钉所在横截面的流场被分成6个区域.料流被迫改变方向重新排列;胶料熔体的速度梯度增加;随着胶料速度梯度的增大,胶料的剪切应力增大,混合指数分布均匀.有销钉混合段的11个截面平均分离尺度小于无销钉混合段的10%.机筒销钉对于分散混合有一定的强化作用,其混合程度高于无销钉结构.

关键词：数值模拟销钉机筒挤出机混合粒子示踪分析

Numerical Simulations of Polymer Melt Conveying in Co-Rotating Twin Screw Extruder

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2002年第2期11卷 189-192页

作者：彭炯陈晋南北京理工大学化工与材料学院北京100081

The 3 D non isothermal flow of non Newtonian viscous polymer melt in a co rotating twin screw extruder is modeled. The distributions of the velocity, temperature, pressure and the viscous dissipation in the flow domain are presented by using a fluid dynamics analysis package (Polyflow). The numerical results show that the temperatures are high in the intermeshing region and on the screw surface, the maximum pressure and the minimum pressure occur in the intermeshing region, and the flow rate is almost proportional to the screw speed.

关键词： twin screw extruder non Newtonian fluid numerical simulation

电解质溶液中表面活性剂控制吸附下液滴的速度

在线全文

学校读者我要写书评

暂无评论

化工学报 2000年第1期51卷 120-125页

作者：陈晋南彭炯北京理工大学化工与材料学院北京100081

In this paper,monolayer saturation and nonideal surfactant interactions are captured with a nonlinear adsorption *** migration of a droplet in surfactant solution with electrolyte is *** prior research studied the migration of a bubble or a droplet in surfactant solution without *** the surfactants in solution with electrolyte are adsorbed at the surface of a bubble or a droplet,an electrical double layer will form near the surface of the bubble or the droplet,which will affect the subsequent adsorption of the surfactants.A group of dimensionless parameters(the interaction coefficient of the adsorbed surfactants K ∞ ,the Marangoni number Ma ,the Biot number Bi and the viscosity ratio k )are discussed in *** surface concentration of the adsorbed surfactants,the surface velocity and the migration velocity of the droplet are obtained by a boundary collocation *** terminal velocity U 0 of the droplet increases as K ∞ increases.

关键词：电解质溶液表面活性剂液滴吸附

在线全文

学校读者我要写书评

暂无评论

注射螺杆流道熔体非等温流场的数值研究

北京理工大学学报 2007年第8期27卷 723-727页

作者：陈晋南王鸳鸯彭炯北京理工大学化工与环境学院北京100081

使用CFD软件Polyflow,数值模拟了注塑机塑化和注射过程中两种止逆螺杆流道内聚丙烯熔体的三维非等温流场,讨论了流道内熔体的温度场、剪切速率场、黏度场和黏性热场.研究结果表明,塑化时,35°锥角比60°锥角螺杆流道内的熔体在螺杆头区... 详细信息

使用CFD软件Polyflow,数值模拟了注塑机塑化和注射过程中两种止逆螺杆流道内聚丙烯熔体的三维非等温流场,讨论了流道内熔体的温度场、剪切速率场、黏度场和黏性热场.研究结果表明,塑化时,35°锥角比60°锥角螺杆流道内的熔体在螺杆头区域的温度高;注射时,35°锥角较60°锥角螺杆流道内熔体在出口处的温度和黏度都均匀.表明35°锥角螺杆与机筒配合得较好,更利于注塑成型.数值计算对比了60°锥角螺杆流道内熔体的非等温和等温流场,在螺杆头某一截面上非等温时熔体的平均黏度值比等温时的减少24%.温度影响熔体流场中各物理量的变化.非等温流场更能反映实际情况.

关键词：三维非等温止逆螺杆数值模拟塑化和注射过程

在线全文

学校读者我要写书评

暂无评论

螺杆转速和机筒温度对加工聚丙烯的影响

北京理工大学学报 2010年第1期30卷 109-113页

作者：陈晋南王鸳鸯彭炯北京理工大学化工与环境学院北京100081

分析工艺条件对螺杆注射加工聚丙烯的影响.在不同螺杆转速和机筒温度条件下,使用有限元法数值计算螺杆头为35°锥角且带止逆环的注射螺杆流道内熔体的三维非等温流场.分析了熔体的温度、剪切应力、黏度和黏性热.研究结果表明,在塑化过程... 详细信息

分析工艺条件对螺杆注射加工聚丙烯的影响.在不同螺杆转速和机筒温度条件下,使用有限元法数值计算螺杆头为35°锥角且带止逆环的注射螺杆流道内熔体的三维非等温流场.分析了熔体的温度、剪切应力、黏度和黏性热.研究结果表明,在塑化过程中,当螺杆转速由45 r/min提高到105 r/min时,熔体的最大流速、剪切应力和黏性热分别增大了1.60,0.41,2.00倍.当机筒温度从573 K降低100 K时,塑化时熔体的最大速度减小了0.011 m/s,熔体的最大剪切应力、黏性热和熔体黏度分别增加了1.13,1.15,6.39倍;注射时熔体的最大流速减小了0.359 m/s,熔体的最大剪切应力、黏度和黏性热分别增大了1.32,2.40,1.87倍.

关键词：数值模拟螺杆转速机筒温度注塑螺杆三维非等温流动