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Yibing Cai Junfeng Xiao Lei Song Weicheng Fan Huaxia Deng 《Polymer-Plastics Technology and Engineering》2013,52(5):541-548
Poly (styrene-acrylonitrile) (SAN)/clay nanocomposites have successfully been prepared by melt intercalation method. The hexadecyl triphenyl phosphonium bromide (P16) and cetyl pyridium chloride (CPC) are used to modify the montmorillonite (MMT). The structure and thermal stability property of the organic modified MMT are, respectively characterized by Fourier transfer infrared (FT-IR) spectra, X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The results indicate that the cationic surfactants intercalate into the gallery of MMT and the organic-modified MMT by P16 and CPC has higher thermal stability than hexadecyl trimethyl ammonium bromide (C16) modified MMT. The influences of the different organic modified MMT on the structure and properties of the SAN/clay nanocomposites are investigated by XRD, transmission electronic microscopy (TEM), high-resolution electron microscopy (HREM), TGA and dynamic mechanical analysis (DMA), respectively. The results indicate that the SAN cannot intercalate into the interlayers of the pristine MMT and results in microcomposites. However, the dispersion of the organic-modified MMT in the SAN is rather facile and the SAN nanocomposites reveal an intermediate morphology, an intercalated structure with some exfoliation and the presence of small tactoids. The thermal stability and the char residue at 700°C of the SAN/clay nanocomposites have remarkably enhancements compared with pure SAN. DMA measurements show that the silicate clays improve the storage modulus and glass transition temperature (Tg) of the SAN matrix in the nanocomposites. 相似文献
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Nanocomposites based on polycarbonate (PC) containing sodium montmorillonite (NaMMT) and maleic anhydride grafted styrene-ethylene/butylene-styrene (SEBS-g-MA) were prepared by melt compounding method followed by injection molding. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed the formation of intercalated nanocomposites. Incorporation of SEBS-g-MA into the PC/MMT nanocomposites enhanced ductility and impact strength but slightly reduced tensile strength and stiffness. The glass transition temperature (T g – detected from DMTA) and onset temperature (T onset – detected from TGA) of the PC nanocomposites was increased in the presence of SEBS-g-MA. For this PC/NaMMT system, SEBS-g-MA could act as an effective toughening agent. 相似文献
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聚乙烯醇/蒙脱石纳米复合材料的结构与性能 总被引:4,自引:1,他引:4
通过溶液插层 流延成膜法,以聚乙烯醇和钠质蒙脱石为原料,制备出了不同蒙脱石含量的聚乙烯醇/蒙脱石纳米复合材料薄膜。用X射线衍射(XRD)、扫描电子显微镜(SEM)、热重分析(TGA)和力学性能测试对复合材料的结构和性能进行了表征。结果表明,聚乙烯醇分子成功进入蒙脱石的层间,实现了在纳米尺度上的复合;蒙脱石含量高于7 5wt%形成插层型的纳米复合材料,低于7 5wt%形成剥离型的纳米复合材料;在SEM图片上还观察到了纳米复合材料的微观结构。纳米复合材料的热稳定性、拉伸强度和直角撕裂强度均比纯聚乙烯醇有很大提高。 相似文献
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分别从制备方法,力学性能,流变性能,微观形态和其他性能5个方面综述了近年来有机改性黏土填充PP/PA6复合材料的研究概况,从而得出结论:要提高有机改性黏土填充PP/PA6纳米复合材料的宏观性能,关键在于微观相容性的提高。 相似文献
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《国际聚合物材料杂志》2012,61(4):220-225
The present study describes the modification of montmorillonite clay (kunipia F) surface by grafting Stearyl Amine Ethoxylate (SAM). Wide-angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM) provided the evidence of formation of a nanocomposite. The interlayer spacing of the kunipia clay was increased from 1.22 nm (unmodified) to 1.53 nm (modified). The TEM study revealed the intercalated and partially exfoliated nature of the nanocomposites. When the modified clay was compounded with SBR rubber, the interlayer spacing was further increased to 1.88 nm. Remarkable improvements in the mechanical properties were found by the addition of a small amount of modified clay. 相似文献
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Intumescent flame-retardant (IFR) high-density polyethylene, poly[ethylene-co-(vinyl acetate)], and organically-modified clay nanocomposites consisting of ammonium polyphosphate (APP) and other charring agents, as well as the nanocomposites pentaerythritol (PER), polyamide-6 (PA), and PA/OMT were investigated. Their thermal and flammability properties have been characterized by thermogravimetric analyses, cone calorimetry, a limiting oxygen index, and the UL-94 test. Results show that the PER-contained sample exhibits different thermal and flammability behaviors from the samples containing polymer charring agents. The difference is postulated to be responsible for the formation of various intumescent structures and their changes in response to heightened temperatures. 相似文献
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Bin Wen Xinfeng Xu Xiaowei Gao Yanfen Ding Feng Wang Shimin Zhang 《Polymer-Plastics Technology and Engineering》2013,52(4):362-371
The ammonium intercalated montmorillonite (A-MMT), especially acid treated montmorillonite (H-S-A-MMT), which experienced silane grafting treatment, exhibited highly exfoliation state in poly(ethylene terephthalate) (PET) matrix. It can be explained that the shear stress was transferred effectively from molten polymer to clay layers during melting processing due to the enhanced polymer-clay interaction by the grafted silane, leading to the slippage and peeling of clay sheets. Furthermore, the equilibrium melting point reduction of highly exfoliated nanocomposite calculated by the Hoffman-Weeks formula exhibited great miscibility between clay and polymer, which was proved by the Nishi-Wang equation. 相似文献
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Both polypropylene (PP) and PP/organo-montmorillonite (OMMT) masterbatch containing antistatic agent (3–9 wt%) were prepared by using co-rotating twin screw extruder followed by injection molding. PP/OMMT masterbatch was prepared by mixing PP, OMMT and maleated PP (PPgMAH). The PP nanocomposites were characterized by using X-ray diffractometer (XRD), differential scanning calorimeter (DSC), thermogravimetry analyzer (TGA), hardness and surface resistivity tests. XRD results indicated that AA could promote the intercalation in PP/OMMT nanocomposites. The decomposition temperature of PP/OMMT/AA nanocomposites is higher than that of PP/OMMT. The hardness, degree of crystallinity and surface resistivity of PP nanocomposites was influenced by the addition of antistatic agent. 相似文献
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聚乙烯醇/蒙脱石纳米复合材料的制备工艺研究 总被引:2,自引:0,他引:2
通过正交实验法研究了溶液插层-流延成膜法制备聚乙烯醇/蒙脱石纳米复合材料中制备工艺条件对复合材料结构的影响,确定了最佳的制备方法。对复合材料进行了TEM表征,结果表明:蒙脱石片层均匀的剥离分散在PVA基体中,蒙脱石含量不高于7.5wt%时,形成了剥离型的纳米复合材料;高于10wt%时,形成了剥离型和插层型共存的纳米复合结构。 相似文献
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通过熔融共混法成功地制备了不同含量蒙脱土的尼龙11/蒙脱土纳米复合材料,利用X衍射(XRD)和透射电镜(TEM)研究了尼龙11/蒙脱土纳米复合材料的微观结构。结果表明,当蒙脱土质量分数小于2%时,形成了剥离型的纳米复合材料,当蒙脱土质量分数超过2%时形成了插层型的纳米复合材料。热重分析表明当蒙脱土质量分数为2%时,纳米复合材料的热分解温度比纯尼龙11提高了27℃。不同蒙脱土含量的纳米复合材料悬臂梁冲击强度均比纯尼龙11的高,但其拉伸强度在蒙脱土质量分数小于8%时降低,以后随蒙脱土含量的增加而提高。 相似文献