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Towards high efficient nanodielectrics from linear ferroelectric P(VDF-TrFE-CTFE)-g-PMMA matrix and exfoliated mica nanosheets EI Scopus SCIE
期刊论文 | 2019 , 469 , 437-445 | Applied Surface Science
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Abstract :

© 2018 Poly(vinylidene fluoride) (PVDF) based polymer/ceramic nanocomposites for high energy density dielectrics have long been plagued by their low discharging efficiency (40–60%), which originates from the matrix with high bulk ferroelectric relaxation and the high-k ceramics with large conduction loss. In this work, a linear-like PVDF-based polymer dielectric is synthesized through grafting poly(methyl methacrylate) (PMMA) onto main chains of poly(vinyl fluoride-trifluoroethylene-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) terpolymer via an atom transfer radical polymerization (ATRP) process. PMMA grafted terpolymer (P(VDF-TrFE-CTFE)-g-PMMA) shows linear-like dielectric characteristics accompanied with greatly enhanced discharging efficiency of ∼80% under 250 MV/m, which is over 100% higher than that of pristine terpolymer. To further improve its breakdown strength and discharging efficiency, the grafted terpolymer are then compounded with ultrasonic-exfoliated mica nanosheets (eMica) by solution-cast method. Thanks to the low hysteresis loss of linear-like dielectric matrix and the high insulating 2D mica nanosheets, the composite with the highest discharging efficiency of ∼78% under 250 MV/m is achieved. The maximum energy density of the optimized composite reaches 9.6 J/cm3, which is nearly 290% that of the pristine terpolymer. Besides, its discharging efficiency is about 74% under 450 MV/m, which is much more advantageous than the other PVDF-based polymer/ceramics composite dielectrics. This work suggests that utilizing polymer matrix with linear dielectric property and fillers with high insulating 2D structure might be a facile strategy to achieve composite dielectrics with simultaneously high energy density and high discharging efficiency.

Keyword :

Discharging efficiency Linear dielectric Mica Nanodielectrics P(VDF-TrFE-CTFE)

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GB/T 7714 Wang, Jian , Xie, Yunchuan , Liu, Jingjing et al. Towards high efficient nanodielectrics from linear ferroelectric P(VDF-TrFE-CTFE)-g-PMMA matrix and exfoliated mica nanosheets [J]. | Applied Surface Science , 2019 , 469 : 437-445 .
MLA Wang, Jian et al. "Towards high efficient nanodielectrics from linear ferroelectric P(VDF-TrFE-CTFE)-g-PMMA matrix and exfoliated mica nanosheets" . | Applied Surface Science 469 (2019) : 437-445 .
APA Wang, Jian , Xie, Yunchuan , Liu, Jingjing , Zhang, Zhicheng , Zhang, Yanfeng . Towards high efficient nanodielectrics from linear ferroelectric P(VDF-TrFE-CTFE)-g-PMMA matrix and exfoliated mica nanosheets . | Applied Surface Science , 2019 , 469 , 437-445 .
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Improved energy storage performance of linear dielectric polymer nanodielectrics with polydopamine coated BN Nanosheets EI SCIE
期刊论文 | 2018 , 10 (12) | Polymers
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Abstract :

Polymer-based nanodielectrics have been intensively investigated for their potential application as energy storage capacitors. However, their relatively low energy density (Ue) and discharging efficiency (η) may greatly limit their practical usage. In present work, high insulating two-dimensional boron nitride nanosheets (BNNS), were introduced into a linear dielectric polymer (P(VDF-TrFE-CTFE)-g-PMMA) matrix to enhance the energy storage performance of the composite. Thanks to the surface coating of polydopamine (PDA) on BN nanosheets, the composite filled with 6 wt% coated BNNS (mBNNS) exhibits significantly improved breakdown strength (Eb) of 540 MV/m and an energy density (Ue) of 11 J/cm3, which are increased by 23% and 100%, respectively as compared with the composite filled with the same content of pristine BNNS. Meanwhile, η of both composites is well retained at around 70% even under a high voltage of 400 MV/m, which is superior to most of the reported composites. This work suggests that complexing polymer matrix with linear dielectric properties with surface coated BNNS fillers with high insulating 2D structure might be a facile strategy to achieve composite dielectrics with simultaneously high energy density and high discharging efficiency. © 2018 by the authors.

Keyword :

Boron nitride nanosheets Composite dielectrics Energy density Energy storage capacitor High energy densities Linear dielectric Polydopamine Storage performance

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GB/T 7714 Wang, Jian , Xie, Yunchuan , Liu, Jingjing et al. Improved energy storage performance of linear dielectric polymer nanodielectrics with polydopamine coated BN Nanosheets [J]. | Polymers , 2018 , 10 (12) .
MLA Wang, Jian et al. "Improved energy storage performance of linear dielectric polymer nanodielectrics with polydopamine coated BN Nanosheets" . | Polymers 10 . 12 (2018) .
APA Wang, Jian , Xie, Yunchuan , Liu, Jingjing , Zhang, Zhicheng , Zhuang, Qiang , Kong, Jie . Improved energy storage performance of linear dielectric polymer nanodielectrics with polydopamine coated BN Nanosheets . | Polymers , 2018 , 10 (12) .
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Polymer-based Nanocomposite Dielectrics with High Energy Storage Capacity EI Scopus CSCD PKU
期刊论文 | 2017 , 43 (7) , 2234-2240 | Gaodianya Jishu/High Voltage Engineering
SCOPUS Cited Count: 1
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Abstract :

As the core material of capacitors, dielectrics with high energy storage capacity have extremely important application in advanced equipment of smart grid and high-energy weapons. In order to improve the energy density of polymer dielectrics, composite technology was usually used to fabricate polymer-based nanocomposite dielectrics. We introduced the basic theory and structure model of several composites, and summarized recent research achievements from three key factors, including dielectric constant, electrical breakdown strength, and energy loss. Moreover, we put forward discussions and prospection on the basis of above scientific issues. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Advanced equipment Breakdown strengths Composite technology Electrical breakdown strengths Energy storage capacity Polymer dielectrics Polymer-based nanocomposites Structure modeling

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GB/T 7714 Jiang, Wanrong , Xie, Yunchuan , Zhang, Zhicheng . Polymer-based Nanocomposite Dielectrics with High Energy Storage Capacity [J]. | Gaodianya Jishu/High Voltage Engineering , 2017 , 43 (7) : 2234-2240 .
MLA Jiang, Wanrong et al. "Polymer-based Nanocomposite Dielectrics with High Energy Storage Capacity" . | Gaodianya Jishu/High Voltage Engineering 43 . 7 (2017) : 2234-2240 .
APA Jiang, Wanrong , Xie, Yunchuan , Zhang, Zhicheng . Polymer-based Nanocomposite Dielectrics with High Energy Storage Capacity . | Gaodianya Jishu/High Voltage Engineering , 2017 , 43 (7) , 2234-2240 .
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Application of ATRP in the synthesis of hyperbranched polymers EI Scopus CSCD PKU
期刊论文 | 2010 , 26 (1) , 162-165 | Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering
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Hyperbranched polymer is a new kind of polymer material with characteristics which is different from that of linear polymers. Atom transfer radical polymerization (ATRP), as a living and controllable method, is playing an important role in the synthesis of hyperbranched polymers. Under the Cu(I) catalyst system, ATRP can catalyze AB* monomer and produce hyperbranched polymers, while synthesize amphiphilic macromolecules with 'core-shell' or other special structures by using multifunctional macromolecules as the initiator. This paper introduced hyperbranched polymers with various structures synthesized by ATRP in recent years and forecasted the future development of the application of ATRP in the synthesis of hyperbranched polymers.

Keyword :

Amphiphilic macromolecules Core shell Cu catalyst Hyperbranched polymers Linear polymers Polymer materials Special structure

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GB/T 7714 Hu, Shu-Jie , Yu, De-Mei , Xie, Yun-Chuan . Application of ATRP in the synthesis of hyperbranched polymers [J]. | Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering , 2010 , 26 (1) : 162-165 .
MLA Hu, Shu-Jie et al. "Application of ATRP in the synthesis of hyperbranched polymers" . | Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering 26 . 1 (2010) : 162-165 .
APA Hu, Shu-Jie , Yu, De-Mei , Xie, Yun-Chuan . Application of ATRP in the synthesis of hyperbranched polymers . | Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering , 2010 , 26 (1) , 162-165 .
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Injection molded plastic microfluidic biochips with integrated pumping electrode EI Scopus
会议论文 | 2010 , 1017-1020
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Abstract :

The plastic microfluidic biochip was successfully fabricated using micro-injection molding technique, and the gold sputtering was applied to fabricate the pumping electrode. Thermal-bonding technology was applied to integrate the microfluid and the pumping electrode. The experiment results show that the dimension of plastic microfluid biochip was in accordance with the nickel mold, which was fabricated by electroforming technology. The inner gas pressure of chamber, generated by electrolysis reaction under 20V, sharply increased enough to propel electrolytic solution to flow into microchannel. ©2010 IEEE.

Keyword :

Electrolysis reaction Electrolytic solution Gas pressures Injection molded plastic Micro fluidic biochips Micro-fluid Micro-injection molding Thermal bonding

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GB/T 7714 Huang, Long-Biao , Yung, Kai-Leung , Xu, Yan et al. Injection molded plastic microfluidic biochips with integrated pumping electrode [C] . 2010 : 1017-1020 .
MLA Huang, Long-Biao et al. "Injection molded plastic microfluidic biochips with integrated pumping electrode" . (2010) : 1017-1020 .
APA Huang, Long-Biao , Yung, Kai-Leung , Xu, Yan , Xie, Yun-Chuan . Injection molded plastic microfluidic biochips with integrated pumping electrode . (2010) : 1017-1020 .
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原子转移自由基聚合在超支化大分子合成中的应用进展 CSCD PKU
期刊论文 | 2010 , (1) , 162-165 | 高分子材料科学与工程
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Abstract :

超支化聚合物是一类具有不同于线性聚合物性质的新型高分子材料,原子转移自由基聚合(ATRP)作为一种活性可控聚合方法,在超支化聚合物合成领域发挥着重要的作用.ATRP在Cu(1)催化体系下不仅可以催化AB~*型单体生成超支化聚合物,而且还可以多官能团的大分子为引发剂,生成具有"核-壳"结构的两亲性共聚物或其它特殊结构大分子.文中主要介绍了近年来采用ATRP法合成的不同结构超支化聚合物,并对ATRP在超支化大分子合成中的应用前景进行了展望.

Keyword :

原子转移自由基聚合 超支化大分子 合成

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GB/T 7714 胡淑婕 , 于德梅 , 解云川 . 原子转移自由基聚合在超支化大分子合成中的应用进展 [J]. | 高分子材料科学与工程 , 2010 , (1) : 162-165 .
MLA 胡淑婕 et al. "原子转移自由基聚合在超支化大分子合成中的应用进展" . | 高分子材料科学与工程 1 (2010) : 162-165 .
APA 胡淑婕 , 于德梅 , 解云川 . 原子转移自由基聚合在超支化大分子合成中的应用进展 . | 高分子材料科学与工程 , 2010 , (1) , 162-165 .
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基础化学
网络公开课
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化学与医学的关系十分密切。“基础化学”是高等医学院校为一年级学生开设的第一门化学课程,其内容涉及无机化学、分析化学和物理化学的一些基础知识和基本原理,主要包括分散系及水溶液中的四大平衡体系,化学反应的基本原理,物质结构与性质的关系,滴定分析法和分光光度法等。在保证化学基本原理、基础知识系统、完整的前提下,紧密结合和突出化学与医学的联系,强调化学在医学中的应用。课程内容设计试图将基础性与专业性有机结合,为学生后续课程如有机化学、生物化学、药理学、生理学等专业课程的学习打下广泛而深入的基础。 同时,通过配套实验课的训练,使学生掌握基本的实验技能,培养良好的实验习惯,养成严谨的科研态度和细致的工作作风,引导和激发学生对化学、医学专业的兴趣及在学习研究中的创新意识。

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GB/T 7714 李健军 . 基础化学 [未知].
MLA 李健军 . "基础化学" [未知].
APA 李健军 . 基础化学 [未知].
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物理化学
网络公开课
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物理化学是一门以物理原理和实验技术为基础,从化学现象和物理现象之间的相互联系入手,研究化学体系的性质和行为,探求化学变化中所具有普遍性规律的学科。物理化学是化学学科的一个重要分支,是化学、化工、环境、材料、生命、医药、能动等专业本科生的一门主干基础课。通过本课程的学习,使学生能系统地掌握物理化学的基本知识和基本原理,加深对自然现象本质的认识,为进一步学习化学及相关专业课程和科学研究奠定基础。同时培养学生提出问题、研究问题、分析以及解决问题的方法和能力。 性质:基础理论 目的:认识和掌握化学基本理论和思想方法,使学生在学习新知识的同时,在严格推理和逻辑思维方面得到一定锻炼,为后续专业基础知识的学习以及毕业后学习新知识打下坚实的基础。 物理化学Ⅰ共64学时,4学分,共分为四大部分,内容如下: 第一部分:化学热力学,根据热力学定律基本定律,通过热力学函数的计算,研究和判断化学反应的方向和限度。 第二部分:电化学,研究电和化学反应之间的相互关系和规律。 第三部分:界面化学,研究物质在多相体系中表面的特征和表面发生的物理和化学过程及其规律。 第四部分:化学动力学,研究化学反应的速率及其影响因素,探讨反应的机理。

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GB/T 7714 郭秀生 . 物理化学 [未知].
MLA 郭秀生 . "物理化学" [未知].
APA 郭秀生 . 物理化学 [未知].
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