检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
机构地区:[1]中国石油大学(北京)理学院能源纳米科技中心,北京102249
出 处:《稀有金属》2014年第1期77-85,共9页Chinese Journal of Rare Metals
基 金:国家科技部重大专项(2011ZX05009-005);国家自然科学基金创新研究群体项目(51221003);国家自然科学基金项目(21076229;51274223);中国石油大学(北京)科学基金(KYJJ2012-06-30)资助项目
摘 要:以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)及蒙脱土(MMT)为主要原料,使用悬浮聚合法制备聚合物(甲基丙烯酸甲酯.共聚-丙烯酸丁酯)/蒙脱土纳米复合微球。采用红外光谱(FTIR)、X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电镜(TEM)对所制备的复合材料微观结构进行了表征;通过热重分析(TGA)对复合材料的热稳定性进行了研究。探讨了蒙脱土含量对复合材料热稳定性及膨胀性能的影响。结果表明,聚合物/MMT纳米复合微球(蒙脱土含量为3%(质量分数))表面光滑且颗粒间团聚现象对比于纯聚合物微球明显改善,平均粒径在60~120μm;XRD分析得出钠基蒙脱土的层间距为1.21nm,十六烷基三甲基溴化铵(CTAB)离子交换改性后的有机蒙脱土层间距为1.88nm,聚合物/MMT复合材料的层间距约为3.53nm,这与TEM分析相符;纯共聚物最大质量损失温度为482℃,当蒙脱土含量为3%时,聚合物/MMT复合材料最大质量损失温度提高到505℃;在本实验条件下,纯聚合物微球在水中最后膨胀率约为250%,聚合物/MMT纳米复合微球(MMT3%)在水中最后膨胀率约为125%。岩心封堵率效果测试表明,纳米聚合物复合微球具有良好的运移能力和深部封堵性能。The poly (MMA-co-BA)/MMT nanocomposite microspheres were prepared by suspension polymerization of methyl methacrylate ( MMA), butyl acrylate (BA) and montmorillonite (MMT). The microstructure of the composites was characterized by fourier transform infrared spectroscopy (FFIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The thermal stability of the composites was studied by thermo-gravimetric analysis (TGA). The effect of the load- ing of MMT on the thermal stability and swelling rate of the composites was discussed. The results showed that the average volume size of the polymer/MMT composite microspheres (3.0% (mass fraction) MMT loading) was in the range of 60 to 120 μm and the polymer/MMT nanocomposite microspheres were smoother and less agglomerated than that of the pure copolymer microspheres. XRD analysis showed that the interlayer spacing was 1.21 nm for Na-MMT, 1.88 nm for CTAB-MMT and about 3.53 nm for polymer/MMT nanocomposites which was consistent with TEM results. The maximum decomposed temperature was 482 ℃ for the pure copolymer and 505 ℃ for polymer/MMT nanocomposites with montmorillonite 3%. The final swelling rate of the pure polymer microspheres was about 250% in deionized water and the final swelling rate of the polymer/MMT nanocomposite microspheres ( MMT 3% ) was about 125%. Tests of microspheres' plugging showed that nanocomposite microspheres had good migration ability and deep flooding performance in the sand tube core.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.222