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RHEOLOGICAL BEHAVIOR OF EPOXY RESIN WATERBORNE DISPERSIONS

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chinese Journal of polymer science 2001年第5期19卷 471-476页

作者： Zhen-zhong Yang Yuan-ze xu De-lu Zhao state key {3. of polymer physics & chemistry, center for molecular science Institute of chemistry, chinese academy of sciences, beijing {13. china 中科院化学所高分子物理与化学国家重点实验室北京

The waterborne dispersions of epoxy resin were prepared by the phase inversion emulsification technique. Rheological behavior and its relationship with the structural change of the systems were studied. It was shown that the concentrated dispersions were highly viscoelastic and pseudoplastic, which was attributed to the formation of a physical network among the waterborne particles via hydrogen bond. The dilute dispersions were Newtonian fluids. The discrete clusters composed of small waterborne particles were found in diluted dispersions. With increasing solid content, there existed a structural transition via percolation through a cluster-cluster aggregation mode to form the physical network, which was qualitatively evidenced by the TEM morphologies.

关键词： epoxy resin waterborne dispersion rheological behavior cluster-cluster aggregation percolation transition

molecular SIMULATION STUDY ON THE CHANGE OF polymer STRUCTURE DURING YIELDING

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chinese Journal of polymer science 2001年第5期19卷 527-529页

作者： Chen-guang xu Tai-ning Liang Juan Sun Xiao-zhen Yang state key {3. of polymer physics and chemistry center for molecular science, Institute of chemistry chinese academy of sciences, beijing {13. china 中科院化学所高分子物理与化学国家重点实验室北京

A better understanding of a recently raised argument on whether there occurs a structure change during yielding has been acquired by using molecular simulation. That is, when monitoring the displacements of all atoms before and after the yield, a structure transition does occur, which is the 'atomic jump' that coordinates the amount of the atoms in the polymer and makes a large step beyond similar to0.05 nm for all those atoms. Results indicate that the complex of polymer chain packing induces the multiple atomic jumps around the yield point. This explains why polymers have a broader yielding peak.

关键词： polymer deformation yield structure transition atomic jump multiple yields

STUDY ON PYROLYSIS OF POLYPHENYLSILSESQUIOXANE

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chinese Journal of polymer science 2002年第6期20卷 573-577页

作者： Jun Ma Liang-he Shi jian-min Zhang Bai-yu Li De-yan Shen jian xu state key laboratory of polymer physics & chemistry center for molecular science, Institute of {3.,chinese academy of sciences, beijing 100080 china center for molecular science Institute of Chemistry Chinese Academy of Sciences State Key Laboratory of Polymer Physics & Chemistry 北京 100080

X-ray photoelectron spectroscopy and Raman spectroscopy were' used to determine the chemical change of polyphenylsilsesquioxane (PPSQ) during pyrolysis in flowing nitrogen. Two temperature ranges were found for pyrolysed PPSQ below and above 600degreesC, respectively. The former is related to the rearrangement of PPSQ backbone and the latter reflects that most of backbone structure of PPSQ might be broken down and unorganized. Carbon formed in carbonization of PPSQ sample pyrolysed at 900degreesC should be sp(3. bonded carbon with crystallite size effects or defects.

关键词： pyrolysis polyphenylsilsesquioxane

STRESS-INDUCED CRYSTALLIZATION OF POLYURETHANE/MONTMORILLONITE NANOCOMPOSITE

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chinese Journal of polymer science 2002年第5期20卷 481-483页

作者： Xin-hua Dai Xiang-dong Luo Qun Gu Xiao-li Zhang De-yan Shen Liang-he Shi jian xu state {3. laboratory of polymer physics and Chemiscy center for molecular science, Institute of chemistry,chinese academy of sciences, beijing {13., china center for molecular science Institute of Chemistry Chinese Academy of Sciences State Key Laboratory of Polymer Physics and Chemistry 北京 100080

Exfoliated polyurethane/montmorillonite nanocomposites with both high elongation at break and high tensilestrength were studied by dynamic-infrared spectroscopy (dynamic-IR). The results show that crystallization indu... 详细信息

关键词： PU/montmorillonite nanocomposite dynamic-IR crystallization

FABRICATION OF SELF-ASSEMBLY DNA-C_(60) MULTILAYER FILMS

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chinese Journal of polymer science 2002年第6期20卷 591-593页

作者： Shu-guang Yang Yong-jun Zhang Xin-hua Dai Wen-hong Tang Chun-yan Liu Wei-xiao Cao Yu-liang Li jian xu state {3. laboratory of polymer physics and chemistry, Institute of chemistry, chinese academy of sciences,beijing {13., china Technology Institute of physics and chemistry chinese academy of sciences, beijing 100101, china College of chemistry and {23. engineering Peking university beijing 100871, china Institute of chemistry Chinese Academy of Sciences State Key Laboratory of Polymer Physics and Chemistry 北京 100080 Technology Institute of physics and chemistry Chinese Academy of Sciences 北京 100101 College of chemistry and molecular engineering Peking University 北京 100871

Electrostatic layer-by-layer self-assembly multilayer films were successfully fabricated from C-60-ethylenediamine adduct (C-60-EDA) and DNA. Under visible light irradiation, DNA is ready to be cleaved and the films a... 详细信息

关键词： self-assembly photo-induced cleavage DNA C-60

In-situ Investigation of molecular Diffusion in Hydrogels

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In-situ Investigation of Molecular Diffusion in Hydrogels

Characterization of the sequence distribution of poly （ethylene-co-vinyl acetate）with NMR spectroscopy

2006年海峡两岸高分子学术研讨会

作者： Lihui Weng, Songmiao Lian, Hongjun Dai, Xianmin Zhang, Lina Zhang, jian xu state key laboratory of polymer physics & chemistry, Institute of chemistry, chinese {3. of sciences, beijing department of chemistry, Wuhan university, Wuhan department of information & electronic engineering, {13. university, hangzhou

＜正＞Hydrogels are three-dimensional polymeric networks swollen by a large amount of water. The ability of hydrogels to restrict the diffusive movement of entrapped solutes and the ease of regulation of the release or adsorption such solutes by controlling the structure of hydrogels offered hydrogels applications in a wide variety of biomedical fields, such as drug delivery systems, biosensors, and biotechnological separation methods. When applying a particular hydrogel, it is therefore important to understand the

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Characterization of the sequence distribution of poly （ethy...

Development of in situ characterization techniques in molecular beam epitaxy

第四届全国高聚物分子表征学术讨论会

作者： Zhiqiang Su, Ying Zhao, Xiuqin Zhang, Shannong Zhu, Dujin Wang, Duanfu xu state key {3. of polymer physics and chemistry, Joint {3. of polymer science and Materials, center for molecular science, Institute of chemistry, chinese {13. of sciences, beijing 100080, china

＜正＞ High-resolution NMR,either solution or solid-state spectra,can provideabundant structure information and has been paid more attention inrecent years, capable of elucidating not only the details of thechemical structure of a polymer,but also its dynamic *** help of high-resolution NMR techniques, the sequence distributionand condensed state of EVA copolymers can be clearly characterized,helping to further understand the structure-property correlations ofthe corresponding materials on a molecular level.

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Journal of Semiconductors 2024年第3期45卷 9-32页

作者： Chao Shen Wenkang Zhan Manyang Li Zhenyu Sun jian Tang Zhaofeng Wu Chi xu Bo xu Chao Zhao Zhanguo Wang laboratory of Solid state Optoelectronics {3. Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials science and Opto-electronic Technology University of Chinese Academy of SciencesBeijing 101804China School of physics science and Technology Xinjiang UniversityUrumqi 830046China School of New Energy and electronics Yancheng Teachers UniversityYancheng 224002China key laboratory of Optoelectronic Materials and Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Ex situ characterization techniques in molecular beam epitaxy(MBE)have inherent limitations,such as being prone to sample contamination and unstable surfaces during sample transfer from the MBE *** recent years,the need for improved accuracy and reliability in measurement has driven the increasing adoption of in situ characterization *** techniques,such as reflection high-energy electron diffraction,scanning tunneling microscopy,and X-ray photoelectron spectroscopy,allow direct observation of film growth processes in real time without exposing the sample to air,hence offering insights into the growth mechanisms of epitaxial films with controlled *** combining multiple in situ characterization techniques with MBE,researchers can better understand film growth processes,realizing novel materials with customized properties and extensive *** review aims to overview the benefits and achievements of in situ characterization techniques in MBE and their applications for material science *** addition,through further analysis of these techniques regarding their challenges and potential solutions,particularly highlighting the assistance of machine learning to correlate in situ characterization with other material information,we hope to provide a guideline for future efforts in the development of novel monitoring and control schemes for MBE growth processes with improved material properties.

关键词： epitaxial growth thin film in situ characterization molecular beam epitaxy(MBE)

Understanding the Interfacial Energy Structure and Electron Extraction Process in Inverted Organic Solar Cells with Phosphine-Doped Cathode Interlayers

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chinese Journal of chemistry 2024年第12期42卷 1347-1354页

作者： Yi Yang Jingwen Wang Yang Xiao Bowei xu jianhui Hou state key laboratory of {3. physics and chemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China state key laboratory of Chemical Resource {3. College of Materials Science and EngineeringBeijing University of Chemical TechnologyBejing 100029China university of chinese academy of {3. Beijing 100049China

Comprehensive Summary Cathode interlayers(CILs)play an essential role in achieving efficient organic solar cells(OSCs).However,the electronic structure at the electrode/CIL/active layer interfaces and the underlying mechanisms for electron collection remain unclear,which becomes a major obstacle to develop high-performance ***,we investigate the relationship of the electron collection abilities of four cross-linked and n-doped CILs(c-NDI:P0,c-NDI:P1,c-NDI:P2,c-NDI:P3.with their electronic structure of space charge region at heterojunction *** accurately calculating the depletion region width according to the barrier height,doping density and permittivity,we put forward that the optimal thickness of CIL should be consistent with the depletion region width to realize the minimum energy *** a result,the depletion region width is largely reduced from 13.nm to 0.8 nm at the indium tin oxide(ITO)/c-NDI:P0 interface,resulting in a decent PCE of 17.7%for the corresponding inverted OSCs.

关键词： Organic solar cells Cathode interlayer Depletion region width Electric conductivity Electron transport Electron transfer Electron extraction process