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Water Soluble Amino Grafted Silicon Nanoparticles and Their Use in Polymer Solar Cells

Chinese Journal of Polymer Science 2014年第4期32卷 395-401页

作者： Quan-xiang Yan Zhuo-wei Gu Qi Li Wei-fei Fu Xiao-qiang Chen Wen-qing Liu Hong-bin Pan Mang Wang 陈红征 State Key Lab of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang University

Stable aqueous amino-grafted silicon nanoparticles （SiNPs-NH2） were prepared via one-pot solution method. By grafting amino groups on the particle surface, the dispersion of SiNPs in water became very stable and clear aqueous solutions could be obtained. By incorporating SiNPs-NH2 into the hole transport layer of poly（3,4- ethylenedioxythiophene）/polystyrene sulfonic acid （PEDOT＇PSS）, the performance of polymer solar cells composed of poly[2-methoxy,5-（2＇-ethylhexyloxy）-1,4-phenylene vinylene] （MEH-PPV）：[6,6]-phenyl-C61-butyric acid methyl ester （PCBM） as active layer can be improved. SiNPs-NH2 are dispersed uniformly in the PEDOT：PSS solution and help form morphologies with small-sized domains in the PEDOT：PSS film. SiNPs-NH2 serve as screens between conducting polymer PEDOT and ionomer PSS to improve the phase separation and charge transport of the hole transport layer. As a result, the sheet resistance of PEDOT：PSS thin films is decreased from （93 ±5） × 10^5 to （13 ± 3） × 10^5 Ω/□. The power conversion efficiency （PCE） of polymer solar cells was thus improved by 9.8% for devices fabricated with PEDOT＇PSS containing 1 wt% of SiNPs-NH2, compared with the devices fabricated by original PEDOT：PSS.

关键词： SiNPs-NH2 Water-soluble Phase separation Polymer solar cells Transport.

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A convenient,highly-efficient method for preparation of hydroxyl-terminated isotactic poly(propylene) and functional di-block copolymer

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Chinese Chemical Letters 2014年第4期25卷 596-600页

作者： Ya-Nan Ye Pei-Yuan Li Yong-Gang Shangguan Zhi-Sheng Fu Qiang Zheng Zhi-Qiang Fan MOE Key Laboratory of Macromolecular Synthesis and Functionalization.Department of Polymer Science and Engineering Zhejiang University

Both terminated functional isotactic polypropylene （iPP） and block copolymers containing iPP segment are desirable for commercial applications. This paper provides a convenient, highly-efficient method to prepare hydroxyl-terminated isotactic polypropylene （iPP-t-OH） and functional di-block copolymer containing the iPP segment through a combination of coordination polymerization and coupling reaction. The coordination polymerization was catalyzed by TiCI4/MgCI2/AIEt3 catalyst system using ZnEt2 as chain transfer agent. Further, the Zn-terminated iPP was oxidized and subsequently hydrolyzed to provide iPP-t-OH. Soxhlet extraction and 13C NMR were used to calculate the isotacticity of iPP-t-OH. The degree of polymerization and the number of hydroxyl groups at the chain end of iPP-t-OH were measured by GPC and 1H NMR. Despite the high molecular weight and heterogeneous reaction, iPP-t-OH is effectively linked with PEG-t-NCO to produce di-block copolymers. DSC analysis of the di-block copolymer shows an obvious decrease in Tm and To, which indicated that PEG was successfully linked to the terminal end of iPP.

关键词： Hydroxyl-terminated isotacticpoly（propylene） Di-block copolymer Functionality Coupling reaction

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synthesis of α-Hydroxy-ω-Aminotelechelic Polypeptide from α-Amino Acid N-Carboxyanhydrides Catalyzed by Alkali-metal Borohydrides

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Chinese Journal of Polymer Science 2014年第6期32卷 743-750页

作者： Hui Peng Wan-li Chen Jie Kong Zhi-quan Shen 凌君 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Center of Analysis & Measurement Zhejiang University of Technology Shaanxi Key Laboratory of Macromolecular Science and Technology School of Science Northwestern Polytechnical University

It is reported that alkali-metal borohydrides （MBH4, M = Li, Na and K） are efficient catalysts for ring opening polymerization （ROP） of α-amino acid N-carboxyanhydrides （NCAs）. Polypeptides are prepared in quantitative yields with relatively narrow molecular weight distributions （MWDs = 1.1-1.5） which depend on the reaction temperature. End groups of the produced polypeptide are studied in detail by MALDI-ToF MS, IH-NMR, 13C-NMR, IH-1H COSY and IH-13C HMQC analyses. The results indicate that α-hydroxy-ω-aminotelechelic polypeptides are formed which are suitable for post- polymerization functionalization.

关键词： Polypeptide Alkali-metal borohydride α -Amino acid N-carboxyanhydride End group functionalization.

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Composite microspheres of water soluble combretastatin A4 phosphate with sustained release and antitumor effect

Composite microspheres of water soluble combretastatin A4 ph...

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2015年中国药学大会暨第十五届中国药师周

作者： Liping wu Yan Peng Liyan Qiu College of Pharmaceutical Sciences Zhejiang University Ministry of Education (MOE) Key Laboratory of Macromolecular Synthesis and Functionalization Department of polymer Science and EngineeringZhejiang University

Combretastatin A4 phosphate(CA4P),the water-soluble phosphate pro-drug of combratastin A4(CA4),has been discovered as a novel vascular disrupting agent(VDA).It can strongly inhibit tubulin polymerlization and selectiv... 详细信息

关键词： Composite microspheres of water soluble combretastatin A4 phosphate with sustained release and antitumor effect

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Fabrication and Performance of a Low Operating Pressure Nanofiltration Poly(vinyl chloride) Hollow Fiber Membrane

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Chinese Journal of Polymer Science 2014年第3期32卷 377-384页

作者： Jian-hua Wang Yue-li Wu Yong-hua Zhang 朱宝库 You-yi Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization MOE Engineering Research Center of Membrane and Water Treatment TechnologyDepartment of Polymer Science and EngineeringZhejiang University

A low operating pressure nanofiltration membrane is prepared by interfacial polymerization between m-phenylenediamine （MPDA） and trimesoyl chloride （TMC） using PVC hollow fiber membrane as supporting. A series of PVC nanofiltration membranes with different molecular weight cutoff （MWCO） can be obtained by controlling preparation conditions. Chemical and morphological characterization of the membrane surface was carried out by FTIR-ATR and SEM. MWCO was characterized by filtration experiments. The preparation conditions were investigated in detail. At the optimized conditions （40 min air-dried time, aqueous phase containing 0.5% MPDA, 0.05% SDS and 0.6% acid absorbent, oil phase containing 0.3% TMC, and 1 min reaction time）, under 0.3 MPa, water flux of the gained nanofiltration membrane reaches 17.8 L/m2-h, and the rejection rates of methyl orange and MgSO4 are more than 90% and 60%, respectively.

关键词： PVC Interracial polymerization Nanofiltration membrane Hollow fiber membrane.

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Fabrication of Hydrophilic and Sponge-like PVDF/Brush-like Copolymer Blend Membranes Using Triethylphosphate as Solvent

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Chinese Journal of Polymer Science 2014年第2期32卷 143-150页

作者： Jian-hua Wang Yong-hua Zhang You-yi Xu 朱宝库 Hong Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization MOE Engineering Research Center of Membrane and Water Treatment Technology Department of Polymer Science and Engineering Zhejiang University

Porous PVDF blend membranes with good hydrophilicity and a symmetric structure were prepared by the phase inversion method using amphiphilic brush-like copolymers, P（MMA-r-PEGMA）, as hydrophilic additive and triethylphosphate （TEP） as solvent. P（MMA-r-PEGMA） was synthesized by radical polymerization in TEP. Then the obtained amphiphilic copolymer solution was mixed with PVDF and TEP to prepare the dope solution. The effects of P（MMA-r-PEGMA） content and coagulation composition on membrane morphologies were investigated using scanning electron microscopy （SEM）. The results demonstrated that, even blended with amphiphilic copolymers, a symmetric structure can be formed. Hollow fiber membranes with a mainly symmetric structure were also fabricated. The dry hollow fiber membranes showed good hydrophilicity, high flux and good rejection performance because of their hydrophilic surface and pores wall.

关键词： Poly（vinylidene fluoride） Membrane Triethylphosphate Hydrophilicity Amphiphilic copolymer.

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Polyelectrolyte Multilayer Patterns Created by Capillary Force and Their Impact on Cell Migration

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Chinese Journal of Chemistry 2014年第1期32卷 66-72页

作者： Lulu Han Jindan Wu Tanchen Ren Zhengwei Mao[*] Yang Guo Changyou Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou Zhengjiang 310027 China Email: Zhengwei Mao (zwmao@***)[*]MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou Zhengjiang 310027 China Fax: 0086-571-87951108

Cell migration plays a crucial role in a variety of physiological and pathological *** this study a method of capillary force lithography was used to treat poly(sodium 4-styrenesulfonate) (PSS)/poly(diallyldimethylammonium) chloride (PDADMAC) multilayers with a PDMS stamp before or after etching by NaC1 solution,yielding physical patterns with various features such as double thin lines,double strips,meniscus-shaped ridges,and high *** ridge height is controllable in the range of 25 and 1100 *** of smooth muscle cells (SMCs) was restrained by the double-line patterns in a ridge height-dependent *** contrast,the mobility of SMCs was controlled by both the hydration ratio of the multilayers and the pattern features.

关键词： capillary force lithography polyelectrolyte multilayer cell migration ridge height salt etching

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Label-free Fluorescent Sensor for Probing Heparin-Protein Interaction Based on Supramolecular Assemblies

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Chinese Journal of Chemistry 2014年第1期32卷 85-90页

作者： Lan Jia Lingyun Xu Zhaohui Wang Jianping Xu Jian Ji[*] MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou Zhejiang 310027 China Email: Jian Ji (jijian@***)[*]MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou Zhejiang 310027 China Tel./Fax: 0086-0571-87953729

In this paper a label-free fluorescent sensor for probing the interaction between heparin and protein was ***,the bioactive polyanions,formed supramolecular assemblies with cationic surfactant cetyltrimethyl ammonium bromide (CTAB).The environment-dependent dye pyrene,encapsulated in hydrophobic interiors of the supramolecular assemblies worked as the fluorescence *** the heparin-binding protein was added,competing interactions of protein with heparin would weaken the interaction between CTAB and *** a result,the noncovalently sequestered pyrene would be released upon disassembly and the fluorescence of the released pyrene was subsequently *** binding events were exemplified by protamine and Tat peptide,these processes were also verified by DLS and *** a strategy is appealing as organic synthesis was traded off against supramolecular *** label-free fluorescent system is simple,selective,convenient,and can serve as a good complement to other existing methods,also this method has the potential for preprimary drug screening.

关键词： supramolecular assemblies fluorescent sensor heparin protein interaction

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Janus‐Membranen: Erforschung ihrer Dualität für hochentwickelte Stofftrennungen

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Angewandte Chemie 2016年第43期128卷

作者： Hao‐Cheng Yang Jingwei Hou Vicki Chen Zhi‐Kang Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou China UNESCO Centre for Membrane Science and Technology School of Chemical Engineering The University of New South Wales Sydney Australien

Janus‐Membranen sind eine neue Materialklasse mit “gegensätzlichen” Seiten, die selektive und oftmals neuartige Transportcharakteristiken zeigen. In diesem Kurzaufsatz schlagen wird eine Definition der Janus‐Membran vor, die über die Definition der Asymmetrie hinausgeht, und diskutieren gängige Herstellungsmethoden. Wir beschreiben aktuelle und potenzielle Anwendungen im gerichteten Stofftransport und in der schaltbaren Permeation und geben Hinweise zur Membranoptimierung mit detaillierten Mechanismen.

关键词： Hydrophober Effekt Grenzflächen Materialwissenschaften Membranen Oberflächenchemie

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Highly oxidized graphene with enhanced fluorescence and its direct fluorescence visualization

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Science China Chemistry 2014年第4期57卷 605-614页

作者： WENG ZhuLin XU Zhen GAO Chao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University School of Mathematical and Physical Sciences Hubei University for Nationalities

We prepared hyper-oxidized graphene(HOG) as a form of graphene derivative by additional oxidation of graphene oxide(GO) sheets. HOG, which formed more functional groups and isolated conjugated clusters on the sheets, accordingly showed high solubility in water and alcohols, high transmittance and film transparence, longer fluorescence decay constant time, and enhanced fluorescence in states of solution and solid. By contrast, GO has much weaker fluorescence in solution and its fluorescence is totally quenched in solid. The influences of concentration, metallic ions, and pH on HOG fluorescence in aqueous solution were also investigated in detail. Due to HOG's strong fluorescence, direct visualization was realized on substrates and in solution. In addition, direct 3D fluorescence visualizations of HOG phase in polymer composites were achieved. These results show the great potential of HOG in a broad range of applications, from biological labeling, probes, and drug carriers to highperformance composites and nanomanipulation.

关键词： highly oxidized graphene enhanced fluorescence fluorescent visualization

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