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Probing the pH-dependent chain dynamics of poly(acrylate acid) in concentrated solution by using a cationic AIE fluorophore

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Science China Chemistry 2013年第9期56卷 1253-1257页

作者： ZHANG Shuang YAN JiMing QIN AnJun SUN JingZhi TANG Ben Zhong MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Department of Chemistry The Hong Kong University of Science & Technology

We report a novel strategy to study the chain dynamics of poly(acrylic acid) (PAA) in a relative concentrated solution (1.0 g/L). The strategy is based on the fluorescent probe (DCTPE) with unique aggregation-induced emission (AIE) characteristics. Free DCTPE molecules are non-emissive in aqueous solution, but they become highly emissive when trapped in polymer coils. The fluorescence intensity is proportional to the efficiency of trapping DCTPE molecules in polymer coils. By correlation the change of fluorescence intensity with the variation of pH value (from 1.78 to 12.06), the PAA chain's dynamics in the relatively concentrated solution have been elucidated into three processes. In the pH range from 12.06 to 6.0, PAA chains take an extended and non-folding conformation. Changing pH from 6.0 to 3.86, PAA chains are partially protonated and loosely packed polymer coils are formed. Further lowering the pH value of the solution (from 3.86 to 1.78), protonated segments dominate the PAA chains, and at the same time, the intermolecular hydrogen bonding takes effect, thus the polymer chains posses in the conformation of more compact coils.

关键词： polyelectrolyte polymer dynamics coils concentrated solution aggregation-induced emission

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The State of OPV–A Meta Analysis

The State of OPV–A Meta Analysis

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中国化学会第29届学术年会

作者： Mikkel Jφrgensen J.E.Carlé R.R.Sφndergaard M.Lauritzen N.A.Dagns-Hansen S.L.Byskov T.R.Andersen T.T.Larsen-Olsen A.P.L.Bttiger B.Andreasen L.Fu L.Zuo Y.Liu E.Bundgaard X.Zhan H.Chen F.C.Krebs Department of Energy Conversion and Storage Technical University of Denmark State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences

A search in the Thomson Reuters Web of Knowledge in January 2012,with the terms"organic solar cells/organic photovoltaics"was used to compile a list of 8962 papers written by 15374 individual authors(excluding reviews and conference proceedings).Solar cell data and bibliographic information was extracted from each of these papers(26 data fields)to create an overview of all OPV data reported to that date.1 The rate of publications shows a rapid exponential increase over a little more than a decade underlining the massive interest in this field of *** of the interesting findings is that there seems to be a universal correlation between the maximum power conversion efficiency(PCEMAX)and the short circuit current(JSC)which holds for all types of PV technologies(except for a few GaAs type cells).

关键词： Polymer Solar Cells Statistical analysis

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Antiba+cterial Activity of Two-Dimensional MoS2 Sheets

Antiba+cterial Activity of Two-Dimensional MoS2 Sheets

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中国真空学会2014学术年会

作者： Tao Liang Xi Yang Jie Li Chunyan Ma Yingying Zhang Hongzheng Chen Nobutaka Hanagata Huanxing Su Mingsheng Xu State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang University Interdisciplinary Laboratory for Nanoscale Science and Technology National Institute for Materials Science State Key Laboratory of Quality Research in Chinese Medicine and Institute of Chinese Medical Sciences University of Macau

Graphene,as a typical two-dimensional layered material,possesses extraordinary electronic and optical properties that render it for a wide range of potential applications including *** by the graphene research and development,graphene-like two-dimensional materials（2DMats）also show application potentials in biomedicine due to their unique ***,environmental and biological influences of these 2DMats remain to be *** we reported the antibacterial activity of two-dimensional（2D）chemically exfoliated M0S2（ce-MoS2）*** found that the antibacterial activity of ce-MoS sheets was much more potent than that of the raw MoS powders used for the synthesis of ce-MoS sheets possibly due to the 2D planar structure（high specific surface area）and higher conductivity of the *** investigated the antibacterial mechanisms of the ce-MoS2 sheets and proposed their antibacterial *** found that the ce-MoS2 sheets could produce reactive oxygen species（ROS）,different from previous report on graphenebased ***,the oxidation capacity of the ce-MoS2 sheets toward glutathione oxidation showed a time and concentration dependent trend,which is fully consistent with the antibacterial behaviour of the ce-MoS *** results suggest that antimicrobial behaviors were attributable to both membrane and oxidation *** antibacterial pathways include MoS-bacteria contact induced membrane stress,superoxide anion（O2·）induced ROS production by the ce-MoS,and the ensuing superoxide anion-independent *** study thus indicates that the tailoring of dimension of nanomaterials and their electronic properties would manipulate antibacterial activity.

关键词： two-dimensional MOS2 sheets chemically exfoliate antibacterial activity biomedicine

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A Novel Strategy for Controlled Formation of Multilayer Core-shell Microspheres

A Novel Strategy for Controlled Formation of Multilayer Core...

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The 7th Textile Bioengineering and Informatics Symposium in Conjunction with the 5th Asian Protective Clothing Conference

作者： Ming Zhang Han Zhu Yin Wang MeiLing Zou TingTing Yang MingLiang Du Department of Materials Engineering College of Materials and TextileZhejiang Sci-Tech University Key Laboratory of Advanced Textile Materials and Manufacturing Technology Zhejiang Sci-Tech UniversityMinistry of Education MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

TiO/PMAA,ZnO/PS/TiO and ZnO/PS/TiO core-shell hybrid microspheres were prepared by miniemulsion *** the increase of MAA contents,the positions of TiO-NPs can move from the center to the edges of PMAA microspheres,which demonstrate a novel strategy for the synthesis of supermolecular assembly *** prepared ZnO/PS/TiO and ZnO/PS/TiO microspheres demonstrate a considerably enhanced photocatalytic activity for the degradation of Rhodamine B（RhB）.

关键词： Miniemulsion Polymerization Core-shell Photocatalytic Nanoparticles

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A GENERAL APPROACH TO DETERMINING THE EVOLUTION OF MOLECULAR WEIGHT DISTRIBUTION CURVES OF LINEAR POLYMERS UNDERGOING CHAIN SCISSION

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Chinese Journal of Polymer Science 2013年第7期31卷 1056-1060页

作者： Zhuo-li Lin Jun Luo Zheng-jian Chen Ke-hua Tu 王利群王衍伟 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Department of Polymer Science and Engineering College of ChemistryChemical Engineering and Materials ScienceSoochow University

A numerical method is developed to compute the development of molecular weight distribution （MWD） curves of linear polymers undergoing chain scission. The method can be applied to complex chain scission kinetics and for arbitrarily complex initial MWD curves. Our method is based on the method of lines （MoL）. Different from the existing numerical scheme, we propose the use of logarithmically spaced points. This development ensures the accuracy of the computed MWD curves at low molecular weights, and it does not require a very fine discretization to produce an accurate result.

关键词： Polymer degradation Reaction kinetics Molecular weight distribution Modeling.

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CATALYST-FREE THIOL-YNE CLICK POLYMERIZATION:A POWERFUL AND FACILE METHODOLOGY FOR PREPARATION OF FUNCTIONAL POLY(VINYLENE SULFIDE)S

CATALYST-FREE THIOL-YNE CLICK POLYMERIZATION:A POWERFUL AND ...

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第六届高分子化学国际学术研讨会

作者： Haiqiang Wu Jing Zhi Sun Anjun Qin Ben Zhong Tang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Guangdong Innovative Research Team State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology Department of Chemistry Institute for Advanced StudyInstitute of Molecular Functional Materialsand State Key laboratory of Molecular NeuroscienceThe Hong Kong University of Science & Technology

The study on alkyne hydrothiolations for the construction of small molecules was reported half a century ago.1 While,this reaction was almost forgotten until Bowman and co-workers developed highly cross-linked polymer networks using the radical-mediated thiol–yne coupling procedure in 2009.2 Since the thiol-yne polymerization enjoys the advantages of the readily available building blocks of the copper(I)

关键词： CATALYST-FREE THIOL-YNE CLICK POLYMERIZATION:A POWERFUL AND FACILE METHODOLOGY FOR PREPARATION OF FUNCTIONAL POLY VINYLENE SULFIDE)S AIE

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Polymersomes of biodegradable polysarcosine-block-poly(ε-caprolactone)

Polymersomes of biodegradable polysarcosine-block-poly(ε-ca...

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The Third Symposium on Innovative Polymers for Controlled Delivery(SIPCD2014) (第三届新型高分子材料与控制释放国际会议)

作者： Yangwei Deng Tao Zou Xingfeng Tao Fatimata Dembele Jun Ling Min-Hui Li MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Institut Curie-CNRS-Université Pierre & Marie Curie Laboratoire Physico-Chimie CurieUMR16875248 ParisFrance

As a mimetic nanostructure of liposomes,polymersomes,i.e.,vesicles composed of amphiphilic block copolymers,have attracted a lot of attention in the field of drug delivery and controlled ***(ethylene glycol) (PEG) is a common choice as the hydrophilic block of copolymers that selfassemble into *** (PSar) is a non-ionic and water-soluble polypeptoid withcomparable properties to those of PEG.

关键词： self-assembly polypeptoids biodegradable sarcosine N-thiocarboxyanhydride

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A RECYCLABLE AND REUSABLE SUPPORTED COPPER CATALYZED AZIDE-ALKYNE CLICK POLYMERIZATION

A RECYCLABLE AND REUSABLE SUPPORTED COPPER CATALYZED AZIDE-A...

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第六届高分子化学国际学术研讨会

The Cu(I)-catalyzed azide-alkyne cycloaddition(CuAAC)of terminal alkyne and organic azide independently reported by Sharpless’and Meldal’s groups in 2002 has found wide applications in the areas of organic synthesis,medicinal chemistry,anion binding,surface modification,as well as bioconjugation etc.1 Moreover,this reaction has also been applied into polymer area.2However,the current catalytic Cu(I)systems for azide-alkyne click polymerization could only be

关键词： A RECYCLABLE AND REUSABLE SUPPORTED COPPER CATALYZED AZIDE-ALKYNE CLICK POLYMERIZATION

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N-Octyloxyallene homopolymerization and random copolymerization with styrene using catalyst system composed of lanthanide Schiff-base complexes and Al(i-Bu)3

N-Octyloxyallene homopolymerization and random copolymerizat...

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作者： Jiao, Junqing Zhu, Weiwei Ni, Xufeng Shen, Zhiquan MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

The catalyst system composed of lanthanide Schiff-base complexes with [3,5-tBu2-2-(O)C6H2CH=NC6H 5]3Ln(THF)(Ln(Salen)3, Ln = Sc, Y, La, Nd, Sm, Gd, Yb) and triisobutyl aluminum shows high activity for n-octyloxyallene (A) homopolymerization with narrow molecular weight distribution (MWD). The influences of reaction conditions on polymerization behavior are investigated, and poly(n-octyloxyallene) has a weight average molecular weight (M w) of 20.6 × 103 with MWD of 1.39 and 100% yield is obtained under the optimum conditions: [Al]/[Y] = 50 mol/mol, [A]/[Y] = 100 mol/mol, with polymerization at 80 C for 16 h in bulk. The kinetic studies of n-octyloxyallene homopolymerization indicate that the polymerization rate is first-order with respect to the monomer concentration and shows some controlled polymerization characteristics. Random copolymer of n-octyloxyallene with styrene is obtained by using the same binary catalyst system;the reactivity ratios of the comonomer determined by Kelen-Tüdös method are r A = 1.20 and r St = 0.35, respectively, the ratio of each segment and M w of the resulting copolymer could be controlled by varying the feed ratio of each monomer. Determined by differential scanning calorimetry, the copolymers obtained show only one glass transition temperature, which increases gradually with the increase of styrene content in the copolymer. © 2013 Science China Press and Springer-Verlag Berlin Heidelberg.

关键词： Styrene

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A RECYCLABLE AND REUSABLE SUPPORTED COPPER CATALYZED AZIDE-ALKYNE CLICK POLYMERIZATION

A RECYCLABLE AND REUSABLE SUPPORTED COPPER CATALYZED AZIDE-A...

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第六届国际高分子化学学术讨论会

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