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grafting modification on the surface of titanium dioxide by polystyrene

Journal of University of Science and Technology Beijing 2003年第6期10卷 52-56页

作者： WeiWu ShouciLu JianfengChen LeiShao CheeKingTan ResearchCenteroftheMinistryofEducationForHighGravityEngineering＆Technology BejingUniversityofChemicalTechnologyBeijing100029China CivilandEnvironmentalEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China NanomaterialsTechnologyPteLtd. 139944Singapore

Based on the technology of titanium dioxide grafting modification withpolystyrene (PS), the modification mechanisms are studied and the polystyrene-grafting states on thesurface of titanium dioxide have been set up. Under the synergistic actions of mechanical force,chemistry and heat, macromolecular free radicals of PS are created, at the same time, the O-O bondsof titanium dioxide are broken and the oxide free radicals produced, and the numbers of oxygen atomare increased and crystal lattice defects rich electrons are formed on the surface of titaniumdioxide. The radical polymerization is the main reaction between PS and titanium dioxide and C-Obonds form in the process of modification. Multi-sites chemical adsorption also exists besidesgrafting between PS and titanium dioxide.

关键词： titanium dioxide polystyrene grafting modification characterization radical polymerization reaction

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Polymer grafting modification of the surface of nano silicon dioxide

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Journal of University of Science and Technology Beijing 2002年第6期9卷 426-430页

作者： WeiWu ShouciLu 等 ResearchCenteroftheMinistryofEducationforHighGravityofEngineering＆Technology BeijingUniversityofChemicalTechnologyBeijing100029China CivilandEnvironmentalEngineeringSchool Uni

Based on the composite modification technology of the surface of nano Silicondioxide by non-soap emulsion polymerization, it is verified that there are polymer grafted on thesurface of nano silicon dioxide. The modification mechanism and the bonding status on the surface ofnano silicon dioxide after modification were suggested via the results of the infrared spectrum,transmission electronic microscope photograph and X-ray photoelectron spectrum. The hydroxyl formedby hydrolyzing of silane coupling agent reacts with hydroxyl on the surface of nano silicon dioxideto form Si-O-Si bonds by losing water molecules and hence the double bonds are introduced onto thesurface of nano silicon dioxide. The surface of nano silicon dioxide is grafted with polymer throughfree radical polymerization between the double bonds on the surface of nano silicon dioxide andstyrene under the action of initiating agent. The dispersibility of nano silicon dioxide and thecontrollability of surface modification of nano silicon dioxide can be greatly improved by themodification process.

关键词： nano silicon dioxide grafting modification mechanism silane couplingagent styrene

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Enhanced Electrical Properties of Styrene-grafted Polypropylene Insulation for Bulk Power Transmission HVDC Cables

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 361-370页

作者： Hao Yuan Shixun Hu Yao Zhou Chao Yuan Wenbo Song Qing Shao Hongwei Shi Juan Li Jun Hu Qi Li Jinliang He SINOPEC Beijing Research Institute of Chemical Industry Beijing 100013China State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Polypropylene(PP)is considered to be a rather promising material for HVDC cable *** modification has proved to be an effective method on the electrical property improvements of *** paper reports on the highlyenhanced electrical properties of styrene-grafted polypropylene(PP-g-St)and their related *** influence of grafting styrene on crystallization structures,thermal properties and electrical properties of PP-g-St are characterized and *** results show that PP-g-St exhibits remarkably enhanced DC volume resistivity,suppressed space charge accumulation and improved DC breakdown strengths as compared to *** observation shows PP-g-St has small,imperfect spherulites with indistinct boundaries,which is strongly correlated to enhanced electrical *** study provides an effective grafting strategy to design high-performance HVDC cable insulation materials for bulk power transmission systems.

关键词： Electrical properties grafting modification polypropylene styrene

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LDPE/TiO2-g-PMMA复合薄膜光催化氧化-生物降解性能的研究

LDPE/TiO2-g-PMMA复合薄膜光催化氧化-生物降解性能的研究

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2014年全国高分子材料科学与工程研讨会

作者：罗颖杨薇宋霜霜董先明华南农业大学理学院应用化学系/生物材料研究所

＜正＞随着"白色污染"的日益严重,人们在不断寻找能够有效解决这个问题的方法。经过不断地努力,各种降解塑料相继问世[1-3]。当前,最为有效、经济的降解技术之一是氧化-生物降解（oxo-biodegradation）技术。氧化-生物降解塑料是一类含... 详细信息

＜正＞随着"白色污染"的日益严重,人们在不断寻找能够有效解决这个问题的方法。经过不断地努力,各种降解塑料相继问世[1-3]。当前,最为有效、经济的降解技术之一是氧化-生物降解（oxo-biodegradation）技术。氧化-生物降解塑料是一类含有加速光、热氧化降解添加剂,致使降解速度大大加快的聚合物制品。塑料在含氧情况下分裂成小分子量的碎片,然后在一般生物

关键词： nano-TiO2 grafting modification LDPE composite film photocatalytic oxo-biodegradation

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