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Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

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Nano-Micro Letters 2021年第10期13卷 131-146页

作者： Guolong Sang Pei Xu Tong Yan Vignesh Murugadoss Nithesh Naik yunsheng ding Zhanhu Guo Department of Polymer Science and Engineering School of Chemistry and Chemical Engineeringand Anhui Key Laboratory of Advanced Functional Materials and DevicesHefei University of TechnologyHefei 230009People’s Republic of China Advanced Materials Division Engineered Multifunctional Composites(EMC)Nanotech.LLCKnoxvilleTN 37934USA Integrated Composites Laboratory(ICL) Department of Chemical and Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Department of Mechanical and Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka 576104India

Lightweight microcellular polyurethane(TPU)/carbon nanotubes(CNTs)/nickel-coated CNTs(Ni@CNTs)/polymerizable ionic liquid copolymer(PIL)composite foams are prepared by non-solvent induced phase separation(NIPS).CNTs and Ni@CNTs modified by PIL provide more heterogeneous nucleation sites and inhibit the aggregation and combination of microcellular *** with TPU/CNTs,the TPU/CNTs/PIL and TPU/CNTs/Ni@CNTs/PIL composite foams with smaller microcellular structures have a high electromagnetic interference shielding effectiveness(EMI SE).The evaporate time regulates the microcellular structure,improves the conductive network of composite foams and reduces the microcellular size,which strengthens the multiple reflections of electromagnetic *** TPU/10CNTs/10Ni@CNTs/PIL foam exhibits slightly higher SE values(69.9 dB)compared with TPU/20CNTs/PIL foam(53.3 dB).The highest specific EMI SE of TPU/20CNTs/PIL and TPU/10CNTs/10Ni@CNTs/PIL reaches up to 187.2 and 211.5 dB/(g cm^(−3)),*** polarization losses caused by interfacial polarization between TPU substrates and conductive fillers,conduction loss caused by conductive network of fillers and magnetic loss caused by Ni@CNT synergistically attenuate the microwave energy.

关键词： Polyurethane Nanocomposites Microcellular Electromagnetic interference shielding

Exponentially increased nucleation ability for poly(L-lactide) by adding acid-oxidized multiwalled carbon nanotubes with reduced aspect ratios

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Science China Chemistry 2013年第2期56卷 181-194页

作者： ZHONG Yong ZHANG YaQiong YANG JingJing LI WenLin WANG ZhiGang XU DongHua CHEN ShouYu ding yunsheng CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Institute of Polymer Materials & Chemical Engineering School of Chemical Engineering Hefei University of Technology Anhui Key Laboratory of Controllable Chemistry Reaction & Material Chemical Engineering

Acid-oxidized multiwalled carbon nanotubes (A-MWCNTs) with a range of reduced aspect ratios (from about 11 to 5.8) were obtained by acid oxidization of MWCNTs in the mixture of HNO 3 and H 2 SO 4 for varying periods of 1, 3, 8 and 12 h, respec- tively. The aspect ratios and surface functionalization of A-MWCNTs were well characterized by scanning electron microsco- py (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and thermogravimetric analysis (TGA). Poly(L-lactide)/A-MWCNT composites containing 0.5 wt% A-MWCNTs with a range of reduced aspect ratios were prepared by solution cast. The effects of added A-MWCNTs on the isothermal crystallization kinetics of poly(L-lactide)/A-MWCNT composites were investigated by means of differential scanning calorimetry (DSC), rheology and polarized optical microscopy (POM). It is surprising to find that not only the addition of A-MWCNTs effectively increases the poly(L-lactide) (PLA) crys- tallization kinetics, but also the nucleation ability of A-MWCNTs for PLA crystallization exponentially increases with the re- duced aspect ratio, that is to say, those with lower aspect ratios show much stronger nucleation ability for PLA crystallization than those with higher aspect ratios. The exponentially increased nucleation ability of A-MWCNTs with a range of reduced aspect ratios for PLA crystallization is disclosed.

关键词： poly(L-lactide) MWCNTs aspect ratio nucleation

咪唑基离子液体Br[C_(14)im](CH_2)_4[C_(14)im]Br对PP结构与性能的影响

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高分子学报 2009年第2期19卷 191-194页

作者：唐海欧丁运生李博轩合肥工业大学化工学院合肥230009

应用Gemini型咪唑基离子液体和聚丙烯(PP)熔融共混,制备出Gemini型咪唑基离子液体改性PP,并对改性PP的结构与性能进行了表征与测试.研究结果表明,Br[C14im](CH2)4[C14im]Br添加到PP中后,起到了异相成核的作用,同时使PP晶体结晶度减小;... 详细信息

应用Gemini型咪唑基离子液体和聚丙烯(PP)熔融共混,制备出Gemini型咪唑基离子液体改性PP,并对改性PP的结构与性能进行了表征与测试.研究结果表明,Br[C14im](CH2)4[C14im]Br添加到PP中后,起到了异相成核的作用,同时使PP晶体结晶度减小;添加离子液体的样品熔融峰温,结晶峰温与纯样相近,同时离子液体也诱导了PP中α晶的生成;Gemini型咪唑基离子液体可以提高PP的抗静电性能,加入量为3 phr时,表面电阻率为8.97×109Ωcm,抗静电性能优良;此外,添加离子液体后样品拉伸强度有所降低,冲击强度有所提高,断裂伸长率有所下降,降低了PP的玻璃化温度,说明离子液体对PP有增塑作用.

关键词： Gemini型咪唑基离子液体聚丙烯共混结构与性能

Wide tunable laser based on electrically regulated bandwidth broadening in polymer-stabilized cholesteric liquid crystal

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Photonics Research 2019年第2期7卷 137-143页

作者： HONGBO LU CHENG WEI QIANG ZHANG MIAO XU yunsheng ding GUOBING ZHANG JUN ZHU KANG XIE XIAOJUAN ZHANG ZHIJIA HU LONGZHEN QIU Key Laboratory of Special Display Technology National Engineering Laboratory of Special Display TechnologyState Key Laboratory of Advanced Display TechnologyAcademy of Opto-Electronic TechnologyHefei University of Technology Key Laboratory of Advanced Functional Materials and Devices Anhui ProvinceSchool of Chemistry and Chemical EngineeringHefei University of Technology School of Instrument Science and Opto-Electronics Engineering Hefei University of Technology Aston Institute of Photonic Technologies Aston University State Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and Technology

Electrically responsive photonic crystals represent one of the most promising intelligent material candidates for technological applications in optoelectronics. In this research, dye-doped polymer-stabilized cholesteric liquid crystals(PSCLCs) with negative dielectric anisotropy were fabricated, and mirrorless lasing with an electrically tunable wavelength was successfully achieved. Unlike conventional liquid-crystal lasers, the proposed laser aided in tuning the emission wavelength through controlling the reflection bandwidth based on gradient pitch distribution. The principal advantage of the electrically controlled dye-doped PSCLC laser is that the electric field is applied parallel to the helical axis, which changes the pitch gradient instead of rotating the helix axis, thus keeping the heliconical structure intact during lasing. The broad tuning range(～110 nm) of PSCLC lasers,coupled with their stable emission performance, continuous tunability, and easy fabrication, leads to its numerous potential applications in intelligent optoelectronic devices, such as sensing, medicine, and display.

关键词： Wide tunable laser electrically polymer-stabilized

Band-gap-tailored random laser

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Photonics Research 2018年第5期6卷 390-395页

作者： HONGBO Lu JIAN XING CHENG WEI JIANGYING XIA JUNQING SHA yunsheng ding GUOBING ZHANG KANG XIE LONGZHEN QIU ZHIJIA Hu Key Laboratory of Special Display Technology Ministry of EducationNational Engineering Laboratory of Special Display TechnologyState Key Laboratory of Advanced Display TechnologyAcademy of Opto-Electronic TechnologyHefei University of TechnologyHefei 230009China Key Laboratory of Advanced Functional Materiels and Devices of Anhui Province School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China School of Instrument Science and Opto-Electronics Engineering Hefei University of TechnologyHefei 230009China Aston Institute of Photonic Technologies Aston UniversityBirmingham B4 7ETUK

A band-gap-tailored random laser with a wide tunable range and low threshold through infrared radiation is demonstrated. When fluorescent dyes are doped into the liquid crystal and heavily doped chiral agent system,we demonstrate a wavelength tuning random laser instead of a side-band laser, which is caused by the combined effect of multi-scattering of liquid crystal(LC) and band-gap control. Through rotating the infrared absorbing material on the side of the LC cell, an adjustable range for random lasing of 80 nm by infrared light irradiation was observed.

关键词： length LC Band-gap-tailored random laser

Thermal Degradation Behavior of Poly（L-lactide）/3-methyl-1（ethoxycarbonylethyl） imidazolium tetrafluoroborate Blends

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Thermal Degradation Behavior of Poly（L-lactide）/3-methyl-1...

2013年全国高分子学术论文报告会

作者： Haoguan Gui Pei Xu Hongmei Xu Shanzhong Yang yunsheng ding Institute of Polymer Materials ＆ Chemical Engineering School of Chemical EngineeringProvincial Key Laboratory of Advanced Functional Materials and DevicesHefei University of Technology

＜正＞The 3-methyl-1-（ethoxycarbonylethyl）imidazolium tetrafluoroborate,[EOEMIm][BF4]),was blended with poly（L-lactide）（PLLA）to evaluate the effects of it on the thermal degradation of PLLA,which were investigat... 详细信息

关键词： poly(L-lactide) [EOEMIm][BF4] thermal degradation apparent activation energy Ozawa-Flynn-Wall method

来源： cnki会议评论

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cnki会议

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传统书院与民办高校的对比研究

黄河科技大学学报 2001年第1期3卷 17-24页

作者：丁润生重庆树人学院重庆400030

我国传统书院与当代民办高校的基本情况、形成机制、办学精神、教学内容与方法等方面既有许多类似点 ,也有不少历史与现实的差异 ,探讨二者的同异与继承等关系。

关键词：传统书院民办高校对比研究

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乙二胺后扩链TDI型聚氨酯水分散体的过程

化工学报 2017年第3期68卷 1247-1252页

作者：范仁祥陈丁丁李嘉晋丁运生合肥工业大学化学与化工学院安徽合肥230009 先进功能材料与器件安徽省重点实验室安徽合肥230009

以甲苯二异氰酸酯(TDI)、聚氧化丙烯二醇和二羟甲基丙酸等为主要原料制备了聚氨酯水分散体,研究了水、扩链温度、原料的—NCO/—OH摩尔比及扩链比对乙二胺(EDA)后扩链TDI型聚氨酯水分散体过程的影响。FT-IR测试表明,分散体中的H_2O可通... 详细信息

以甲苯二异氰酸酯(TDI)、聚氧化丙烯二醇和二羟甲基丙酸等为主要原料制备了聚氨酯水分散体,研究了水、扩链温度、原料的—NCO/—OH摩尔比及扩链比对乙二胺(EDA)后扩链TDI型聚氨酯水分散体过程的影响。FT-IR测试表明,分散体中的H_2O可通过与聚氨酯中残留异氰酸酯基团(—NCO)的竞争反应影响EDA的后扩链过程。分子量及粒径与zeta电位测试表明,H_2O扩链导致分散体失稳;低扩链比时,H_2O对EDA的后扩链过程影响明显,但高扩链比时,后扩链聚氨酯的分子量降低;扩链温度升高,经EDA后扩链聚氨酯的分子量降低,而分散体粒径增大。当原料的—NCO/—OH摩尔比为1.20、扩链温度为30℃、扩链比为60%时,可有效降低H_2O对EDA后扩链聚氨酯过程的影响。

关键词：聚氨酯分散体甲苯二异氰酸酯水后扩链扩链比粒度分布

THE RELATIONSHIPS BETWEEN EFFICACY OF GEOELECTRICAL RESISTIVITY METHOD IN EARTHQUAKE PREDICTION AND SITE CONDITION

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地震工程学报 1992年第2期 98-110页

作者： Chen Youfa, Wang Defu~*, Zhao Heyun, Jiang Zhixiong~*, Kang yunsheng. ding Hui (Earthquake Research histitute of LanZhou, SSB, China)

INTRODUCTION In the past two decades, field observation, laboratory experiments, and the theoretical studies in the study on earthquake prediction have been carried out in several countries, by using ρmethod, and valuable results have been achieved. The first geoelectrical resistivity (ρ) observatory for earthquake forecasting established at

关键词： rock THE RELATIONSHIPS BETWEEN EFFICACY OF GEOELECTRICAL RESISTIVITY METHOD IN EARTHQUAKE PREDICTION AND SITE CONDITION 西北地震学报地震预报电阻率法比电阻法电法勘探 Chen SITE