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Electrically Conductive and Flame Retardant Graphene/Brominated Polystyrene/Maleic Anhydride Grafted High Density Polyethylene Nanocomposites with Satisfactory Mechanical Properties

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Chinese Journal of Polymer Science 2019年第5期37卷 509-517页

作者： Yu Chen Jian Yao Ming-Ke Xu Zhi-Guo Jiang Hao-Bin Zhang National Key Laboratory of Advanced Composites Beijing Institute of Aeronautical Materials Beijing Key Laboratory of Advanced Functional Polymer Composites College of Materials Science and EngineeringBeijing University of Chemical Technology

Electrically conductive and flame-retardant maleic anhydride grafted high-density polyethylene(MA-HDPE) nanocomposites with satisfactory mechanical properties are fabricated by melt compounding MA-HDPE with polyethyleneimine(PEI)-modified reduced graphene oxide(PEI@RGO) as the conductive nanofiller and brominated polystyrene(BPS) as the flame retardant. The modification with PEI significantly improves the interfacial compatibility and dispersion of the RGO sheets in the MA-HDPE matrix, leading to electrically conductive nanocomposites with enhanced mechanical properties. Furthermore, the addition of 25 wt% of BPS makes the nanocomposite flame-retardant with a UL-94 V-0 rating. Thus, the multifunctional RGO/MA-HDPE nanocomposites with good electrical, flameretardant, and mechanical properties would have potential applications in construction and pipeline fields.

关键词： Polymer nanocomposites High density polyethylene Graphene Electrical conductivity Flame retardancy

Synergistic Flame-retardant Effect of Epoxy Resin Combined with Phenethyl-bridged DOPO Derivative and Graphene Nanosheets

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Chinese Journal of Polymer Science 2019年第1期37卷 79-88页

作者： Wei Yan Ming-Qiu Zhang Jie Yu Sheng-Qiang Nie Dai-Qin Zhang Shu-Hao Qin School of Chemistry Sun Yat-sen University School of Chemistry and Materials Engineering Guiyang University National Engineering Research Center for Compounding and Modification of Polymer Materials

Phenethyl-bridged DOPO derivative(DiDOPO)was combined with graphene nanosheets(GNSs)in epoxy resin(EP)to improve its flame *** results indicated that the introduction of only 1.5 wt%DiDOPO/1.5 wt%GNS in EP increased the limited oxygen index(LOI)from 21.8%to 32.2%,hence meeting UL 94 V-0 *** thermogravimetric analyses revealed that char yield rose in presence of GNSs to form thermally stable carbonaceous *** decomposition and pyrolysis products in gas phase were characterized by thermogravimetry-Fourier transform infrared spectroscopy(TG-FTIR),and the release of large amounts of phosphorus was detected in the gas *** evaluation of flame-retardant effect by cone calorimetry demonstrated that GNSs improved the protective-barrier effect of fire residue of EP/DiDOPO/*** latter was further confirmed by digital photography and scanning electron microscopy(SEM).Also,Raman spectroscopy showed that GNSs enhanced graphitization degree of the resin during ***,the combination of DiDOPO with GNSs provides an effective way for developing high-performance resins with improved flame retardancy.

关键词： Epoxyresin DOPO derivative GNS Flame retardancy

On the electron-beam (EB) irradiation and grafting of acrylic monomers onto EVA copolymers

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Chinese Science Bulletin 1997年第18期42卷 1549-1554页

作者： Zhang, S Wang, JQ Xie, LQ Wen, CL BEIJING INST TECHNOL SCH CHEM ENGN & MAT SCISTATE KEY LAB FLAME RETARDANT MATBEIJING 100081PEOPLES R CHINA

IN an ordinary way the grafting induced by electron and gamma preirradiations widely used for improving the compatibility of polymers in composites gives rise to an enhancement of their mechanical properties. However, very few have been reported in the flame retardancy of polymers using these sorts of techniques. Wilkie investigated the flame retardancy of photo-initiation grafted polymers. An attempt is made in this paper to try to use the EB preirradiation on EVA copolymers with different VA contents and the subsequent grafting with saponification under atmosphere and to expedite the charring of polymers upon heating. Characterization of the flammability of the preirradiated EVA copolymers grafted with acrylic monomers indicates that this approach turns out to be a promising way and worthy of doing.

关键词： electron-beam irradiation grafting flame retardancy EVA copolymers.

PRELIMINARY STUDIES ON STRUCTURES AND PROPERTIES OF WATER-RETENTIVE, FLAME-RETARDANT ACRYLIC FIBERS

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Journal of China Textile University(English Edition) 1990年第1期8卷 45-52页

作者：刘兆峰林伟平杨明远吴宗铨 Man-made Fiber Research Institute

The blend fibers of acrylonitrile-vinylidene chloride-sodium methallysulfonate copolymer(AN-VDC-SMAS) and cellulose acetate (CA) with various blend ratios were investigated bymeans of SEM, DDV, WAXD, etc. The results show that AN-VDC-SMAS and CA areincompatibale; the numerous microvoids in the blend fiber resulted from the phase seperationcan remarkably improve the water absorbability and the dyeing behavior but hardly influencethe mechanical properties. On the other hand, the crystal structure of the continuous phaseAN-VDC-SMAS is not influnced by the dispersed phase CA.

关键词： compatibility crystal perfection crystal structure morphology mechanical properties water absorbability flame retardancy dyeing saturation uptake

Flame Retardant and Pyrolytic Behaviors of Polyamide 6/Montmorillonite Nanocomposite

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Defence Technology（防务技术） 2005年第2期1卷 162-168页

作者：刘治国欧育湘吴俊浩 National Lab of Flame-retarded Materials Beijing Institute of Technology Beijing 100081 China School of Chemistry and Chemical Engineering Henan University Kaifeng 475001 Henan China National Lab of Flame-retarded Materials Beijing Institute of Technology Beijing 100081 China Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

Na +-montmorillonite(Na +-MMT) was converted to organic montmorillonite(OMMT) using modifier which was synthesized at authors’ laboratory. PA6/OMMT nanocomposite was prepared via in situ intercalative polymerization. The limiting oxygen index (LOI), UL 94V flame retardancy and thermal stability of PA6/OMMT using thermal gravity analysis (TGA) were measured. The Fourier transform infrared (FTIR) technique was used to analyze the pyrolytic residuum and the cone calorimeter (CONE) was applied to determine a number of combustion parameters which were closely related to fire safety, including heat release rate, mass loss rate, effective combustion heat, total heat release, specific extinction area and the time of ignition. In addition, the elemental composition of the surface pyrolytic residuum and the corresponding X-ray photoelectron spectroscopy (XPS) data were obtained, and the morphology of the residuum from CONE measurement was examined by scanning electron microscope (SEM).

关键词： polyamide 6 montmorillonite nanocomposite in situ intercalative polymerization flame retardancy pyrolysis