• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Research >Synthesis of polystyrene-grafted carbon nanocapsules
【24h】

Synthesis of polystyrene-grafted carbon nanocapsules

机译：聚苯乙烯接枝碳纳米胶囊的合成

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A novel polymeric composite material, polystyrene (PS)-grafted carbon nanocapsules (CNCs), has been prepared, .sec-butyllithium was first used to introduce negative charges on CNCs, and these CNC carbanions acted then as initiators for anionic polymerization of styrene. Based on a weight loss at the decomposition temperature of the butyl groups, the quantity of the butyls attached to the CNC surface was determined as 1.18 wt percent, corresponding to 0.25 mol percent initiator per mol of carbon atom on the CNC surface. Furthermore, the decomposition temperature of butylated CNCs was lower than that of the pristine CNCs by nearly 200 deg C. The polystyrene content in our PS-grafted CNC sample was approximately 20 percent, and the molecular weight of the grafted PS on the surface of CNCs was calculated as 1200 gmol"1. Compared with the molecular weight of the ungrafted PS, the molecular weight of grafted PS was lower, thus indicating rates of initiation and/or propagation for CNC-bound carbanions lower than those of the free sec-butyllithium. The PS-grafted CNCs had good dispersion in toluene, tetrahydrofuran, cyclohexane, and other common organic solvents in which polystyrene was dissolvable and thus indicated good compatibility when further blended with other styrenic polymers. The PS-grafted CNCs were characterized and examined by Fourier transform infrared, thermogravimetric analysis, atomic force microscopy, differential scanning calorimetry, ultraviolet-visible spectroscopy, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electron microscopy images indicated that the PS-grafted CNCs were homogeneous composites containing uniform polymer/CNC ratios.
机译：已经制备了一种新型的聚合物复合材料，即聚苯乙烯（PS）接枝的碳纳米胶囊（CNC），首先使用仲丁基锂在CNC上引入负电荷，然后这些CNC碳负离子充当苯乙烯的阴离子聚合反应的引发剂。基于在丁基的分解温度下的重量损失，附着在CNC表面上的丁基的量被确定为1.18重量％，对应于每摩尔CNC表面上的碳原子0.25摩尔％的引发剂。此外，丁基化CNC的分解温度比原始CNC的分解温度低近200℃。我们的PS接枝CNC样品中的聚苯乙烯含量约为20％，并且接枝PS在CNC表面的分子量计算为1200 gmol“ 1。与未接枝的PS的分子量相比，接枝的PS的分子量较低，因此表明与CN结合的碳负离子的引发和/或扩散速率低于游离的仲丁基锂。 PS接枝的CNCs在甲苯，四氢呋喃，环己烷和其他可溶解聚苯乙烯的常见有机溶剂中具有良好的分散性，因此当与其他苯乙烯类聚合物进一步共混时显示出良好的相容性。变换红外，热重分析，原子力显微镜，差示扫描量热法，紫外可见光谱法，拉曼光谱法，罐装电子显微镜和透射电子显微镜。电子显微镜图像表明，PS接枝的CNCs是均聚物/ CNC比均一的复合材料。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号