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SYNTHESIS AND PROPERTIES OF ACRYLIC-BASED SUPERABSORBENTS WITH ENHANCED CROSSLINKING ON PARTICLE SURFACE

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Chinese Journal of polymer science 2005年第5期23卷 463-469页

作者： Jian Huang Zhi-ming Huang yong-zhong Bao Zhi-xue Weng State Key Laboratory of polymer Reaction {2.,zhejiang university,hangzhou 3.0027,china zhejiang Univ State Key Lab Polymer React Engn Hangzhou 310027 Peoples R China

A series of acrylic-based superabsorbent resins were synthesized by inverse suspension polymerization, using potassium persulfate as the initiator, N, N＇-methylene bisacrylamide （BIS） and divinylbenzene （DVB） as the multiple crosslinking agents. The morphology of the resulting superabsorbent resins revealed by SEM demonstrated that a hard shell layer was indeed formed due to surface crosslinking. The swelling and deswelling properties, and the mechanical strength of superabsorbents were investigated. The results indicated that the adding time of DVB and the amount of DVB participated in the crosslinking show a significant influence on the properties of superabsorbents. When DVB was added in polymerization later, the amount of DVB participated in reaction decreases and the surface crosslinked shell becomes thinner. It is suitable for DVB to be introduced in the later stage of the polymerization process, because the absorption rate of resin is efficiently improved in conjunction with higher water absorption. Furthermore, it was found that the mechanical strength of swollen superabsorbent with surface crosslinking was indeed enhanced in comparison with that of the conventional one.

关键词： Superabsorbet Inverse suspension polymerization Water absorption Surface crosslinking Mechanical strength.

Effects of Al(i-Bu)_3 on Propylene polymerization and Copolymerization by rac-Me_2.i(Ind)_2.rCl_2.MAO

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Chinese Chemical Letters 1998年第1期9卷 83-85页

作者： Zhi Qiang FAN yong Hui ZHANG Qi WANG Lin Xian FENG (Department of polymer {2. and engineering, zhejiang university, hangzhou 3.0027) zhejiang Univ Dept Polymer Sci & Engn Hangzhou 310027 Peoples R China

The effects of adding Al(i-C_4H_9)_3 (TBA) to rac-Me2.i(Ind)2.rCl2. MAO catalyzed propylene-1-octene copolymerization were studied. At TBA /MAO (Al/AI mole ratio) of about 0.6, the polymerization activity was found to be much higher than the system without TBA. Increases of polymer molecular weight and 1-octene content from addition of TBA were also observed.

关键词： propylene-1-octene polymerization metallocene catalyst

Fabrication pressures and stack pressures in solid-state battery

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escience 2024年第4期4卷 27-40页

作者： Zhijun Wu shengnan He Chao Zheng Jiantuo Gan Liaona she Mingchang Zhang {2. Gao Yaxiong Yang Hongge Pan Institute of science and Technology for New Energy Xi'an Technological UniversityXi'an 710021China State Key Laboratory of Silicon Materials and School of Materials science and engineering Zhejiang UniversityHangzhou 310027China

Solid-state batteries(SSBs)have received widespread attention with their high safety and high energy density ***,solid-solid contacts in the internal electrode material and the electrode material/solid electrolyte(SE)interfaces,as well as the severe electrochemo-mechanical effects caused by the internal stress due to the volume change of the active material,these problems hinder ion/electron transport within the SSBs,which significantly deteriorates the electrochemical *** fabrication pressures and stack pressures are effective measures to improve solid-solid contact and solve electrochemo-mechanical ***,the influences of different pressures on cathode material,anode material,SEs,and electrode/SEs interface are briefly summarized from the perspective of interface ion diffusion,transmission of electrons and ions in internal particles,current density and ion diffusion kinetics,and the volume changes of Li^(+)stripping/plating based on two physical contact models,and point out the direction for the future research direction of SSBs and advancing industrialization by building the relationship between pressures and SSBs electrochemistry.

关键词： Fabrication pressure Stack pressure Solid-state battery Solid electrolyte Ion/electron transport

Synthesis, Purification and Characterization of Amphiphilic and Microphase Separated Graft Copolymer Polystyrene-g-Poly(ethylene oxide)

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Chemical Research in Chinese Universities 1992年第3期8卷 278-286页

作者： QIU yong-xing, YU Xiao-jie, FENG Lin-xian and YANG Shi-lin (Department of polymer {2. and engineering, zhejiang university, hangzhou)

The present paper covers the poly (ethylene oxide) macromer with vinyl benzyl terminal group (PEO-VB) prepared by deactivation of the alkoxide function of mono-functional 'living' PEO chains with vinyl benzyl chloride (VBC). The obtained macromers were subjected to careful purification and detailed characterization. A new kind of amphiphilic polystyrene-g-poly(ethylene oxide) (PS-g-PEO) with both mi-crophase separated and PEO side chains was synthesized from radical copolymerization of PEO-VB macromer with styrene monomer. An improved purification method, referred as 'selective dissolvation', was established for the isolation of graft copolymers from the grafting products, and the purity and yield of the purified copolymers were satisfactory. The well-defined structure of the purified copolymers was confirmed by IR, 1H NMR and GPC. The bulk composition of the graft copolymers was determined by a well-established first derivative UV spectrometry. Various experimental parameters controlling the copolymerization were also studied. The results indicate that the feed ratio of macromer to styrene (M/S) was the most important factor in determining the composition of the copolymers. Thus a series of PS-g-PEO with a wide range of bulk compositions were obtained simply by adjusting the value of M/S. As clearly indicated by transmission electron microscopy, this amphiphilic graft copolymers may readily form microphase separated structures.

关键词： Poly(ethyiene oxide) macromer Polystyrene-g-poly(ethylene oxide) Pu-rification of graft copolymer Amphiphilic and microphase separated structure Biocom-patible polymer

One-pot synthesis of a giant twisted double-layer chiral macrocycle via [4+8] imine condensation and its X-ray structure

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Chinese Chemical Letters 2024年第10期35卷 241-243页

作者： Yu Pang Min Wang Ning-Hua Yang Min Xue yong Yang School of science Department of PhysicsKey Laboratory of Optical Field Manipulation of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018China School of Chemistry and Chemical engineering Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou310018China

Trifluoroacetic acid(TFA)catalyzed condensation reaction between tetraaminooxacalix[4]arene and N-alkylcarbazole-3,6-dicarbaldehyde in CH_(2.Cl2.fforded a single product in 87%–89%***-defined yet undissolvable1H NMR spectra suggested formation of robust and discrete structures in solution.X-ray single crystal analysis further revealed a giant twisted double-layer chiral macrocycle in the solid state,which was formed from[4+8]condensation of the two reactants via 16 imine *** calculations discovered that only the[4+8]twisted product is thermodynamically favorable,which accounts for its highly selective and efficient formation out of a library of many other combinations.

关键词： One-pot synthesis Oxacalixarene Dynamic covalent chemistry Chiral macrocycle X-ray single crystal

Semitransparent Organic Solar Cells with Superior Thermal/Light Stability and Balanced Efficiency and Transmittance

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Energy & Environmental Materials 2024年第4期7卷 215-222页

作者： Zhipeng Yin Huan Zhao Yang Liu Xunwen Xiao yong Zhang Huahang Lai Ning Li Hai-Qiao Wang School of Materials science and engineering Ningbo Tech University State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices School of Materials Science and Engineering South China University of Technology Ningbo university of Technology Ningbo Institute of Technology Beihang University Hangna Nanofabrication Equipment Co. Ltd.

Semitransparent organic solar cells show attractive potential in the application of building-integrated photovoltaics,agrivoltaics,floating photovoltaics,and wearable electronics,as their multiple functionalities of e... 详细信息

关键词： organic solar cell semitransparent thermal/light stability

Advanced cellulose-based materials toward stabilizing zinc anodes

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science china Chemistry 2024年第5期67卷 1465-1484页

作者： Zhijiang Li Xiang Chen Rui Zhang Taoyi shen Jianchao Sun Zhongce Hu Lin Li Lanlan Yang Hou-yong Yu College of Textile science and engineering(International Institute of Silk) Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory for Modification of Chemical Fibers and polymer Materials Donghua UniversityShanghai 201620China School of Environment and Material engineering Yantai UniversityYantai 264005China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Rechargeable aqueous zinc metal batteries(RAZMBs) have received extensive attention for large-scale energy storage systems due to the merits of Zn anodes, including moderate volumetric and gravimetric energy density, low redox potential, abundant reserve, low cost and impressive intrinsic safety. However, Zn anodes suffer from a series of adverse reactions(dendrite growth,hydrogen evolution, and surface passivation) resulting in low Coulombic efficiency, large polarization, and unsatisfied cycling performance, which inevitably hinder the wide application of RAZMBs. To address the above issues, cellulose-based materials are widely used for Zn anode protection because of their unique physical and chemical properties and other advantages such as biocompatibility, non-toxicity, degradability and easy extraction. In order to better understand the current progress in cellulosebased materials for the Zn anode protection, we have classified and summarized the relevant literatures. In this review, we summarize and elaborate the causes of poor reversibility for Zn anodes, including dendrite formation, hydrogen evolution, and surface passivation. Subsequently, the effective strategies(anode interfacial engineering, gel electrolyte optimization, and separator modification) of cellulose-based materials toward stabilizing Zn anodes are overviewed. In the end, the existing challenges and prospects of cellulose-based materials in Zn anode protection are summarized to shed light on future work.

关键词： Zn anode cellulose anode interfacial engineering gel electrolyte optimization separator modification

Improving Thermal-oxidative Aging Resistance of Styrene-butadiene Rubber by Antioxidant Loaded Silica Aerogel

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Chinese Journal of polymer science 2024年第8期42卷 1198-1209页

作者： Xue-Fei Ping Yu Wang Lu Liu Fu-yong Liu Hong-Wei He Pi Wang Wen-Wen Yu Qiang Zheng College of Materials science and engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical engineering Taiyuan 030032China Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China

The antioxidant N-isopropyl-N'-phenyl-p-phenylenediamine(4010NA)was dissolved in ethanol and impregnated into silica aerogel(SAG)via vacuum-pressure cycles,yielding composite particles(A-N)with enhanced sustained-release and reinforcing *** effect of A-N on the mechanical properties and thermal-oxidative aging resistance of styrene-butadiene rubber(SBR)vulcanizates was *** and BET assessments indicated that the loading efficiency of 4010NA in SAG reached 14.2.%within ethanol's solu bility *** A-N into SBR vulcanizates significantly elevated tensile strength by 17.5%and elongation at break by 41.9%over those with fumed silica and ***,A-N notably enhanced the thermal-oxidative aging resistance of *** aging for 96 h at 100℃,the tensile strength and elongation at break of SBR with A-N sustained 70.09%and 58.61%of their initial values,respectively,with the retention rate of elongation at break being 62.8%higher than that of SBR with fumed silica and free *** study revealed that A-N composite particles significantly inhibited the crosslinking in SBR's molecular chains,reducing hardening and embrittlement during later thermal-oxidative aging stages.

关键词： Styrene-butadiene rubber Silica aerogel Loading modification Thermal-oxidative aging

Synthesis of Long-Chain Oligomeric Donor and Acceptors via Direct Arylation for Organic Solar Cells

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Chinese Journal of Chemistry 2024年第5期42卷 523-532页

作者： Yu Wu Xin-Yu He Xu-Min Huang Ling-Jun Yang Peng Liu Na Chen Chang-Zhi Li Shi-yong Liu Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry College of MaterialsMetallurgical and ChemistryJiangxi University of Science and TechnologyGanzhouJiangxi341000 China Department of polymer science and {2. Zhejiang UniversityHangzhouZhejiang310027 China

The rapid synthesis of structurally complicated electron donors&acceptors still remains a major challenge in organic solar cells(OSC).In this work,we developed a highly efficient strategy to access long-chain oligomeric donor and acceptors for OSC applications.A series of cyclopentadithiophene(CPDT)and benzothiadiazole(BT)-basedπ-conjugated oligomers,i.e.,three oligomeric acceptors(BTDT)n-IC(n=1—3)and one long-chain oligomeric donor(BTDT)4-RD,are facilely synthesized by an atom-and step-economical,and labor-saving direct C—H arylation(DACH)reaction(i.e.,C—H/C—Br cross coupling).Note that(BTDT)4-RD involving five CPDT,four BT and two rhodamine(RD)building blocks is the longest oligomeric donor in the fullerene-free OSC devices ever *** dependence of the structure-property-performance correlation of(BTDT)n-IC(n=1—3)and(BTDT)4-RD on theπ-conjugation lengths is thoroughly investigated by opto-electrochemical measurements,bulk heterojunction(BHJ)OSC devices and ***(BTDT)1-IC:PBDB-T and(BTDT)4-RD:Y6 BHJs achieve power conversion efficiencies of 9.14%and 4.51%,*** findings demonstrate that DACH reaction is a powerful tool to tune the opto-electronic properties and device performances by regulating the lengths ofπ-conjugated oligomers with varied numbers of repeating units.

关键词： Long-chainπ-conjugated oligomer Organic solar cells Direct arylation Atom-economical synthesis Cyclopentadithiophene Benzothiadiazole C—H activation Conjugation Oligomers