碳纳米球/聚乙烯复合物的制备与表征  

The Preparation and Characterization of Carbon Nanosphere/Polyethylene Composites

作　　者：郭江平[1] 余朦山[1] 王静[1] 周阳[1] 刘智[1] 李凤娇[1] 义建军 黄启谷[1] 刘云芳[1] 杨万泰[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室碳纤维及功能高分子教育部重点实验室,北京100029 [2]中国石油石油化工研究院合成树脂重点实验室,北京100083

出　　处：《高分子学报》2014年第5期686-691,共6页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号21174011);中石油创新基金(基金号2011D-5006-0502)资助项目

摘　　要：以碳纳米球为载体,经格氏试剂处理后,与TiCl4反应制成负载型Ziegler-Natta催化剂,在AlEt3存在下,催化乙烯聚合,原位制备聚乙烯(PE)/碳纳米球(CSs)复合物,催化剂活性达5.7×106gPE/(molTi·h),聚乙烯分子量为4.9×105.HRTEM和SEM结果表明,常压聚合条件下聚乙烯/CSs复合物为核-壳结构,颗粒呈圆形,直径约为1μm左右,复合物颗粒中包含碳纳米球.介电分析结果表明,由于碳纳米球的引入,复合物的介电性能相较于普通聚乙烯有明显的提高,从而提高了聚乙烯的抗静电性能,且介电常数和介电损耗都随着聚合时间的延长而降低.此外,采用WAXD,DSC和TGA表征了PE/CSs复合物的结晶性能和热性能,结果表明聚乙烯/CSs复合物具有好的结晶性能和热稳定性能.Carbon nanospheres （CSs） treated with Grignard reagent were used as carrier,which reacted with TiC14 to form supported Ziegler-Natta catalyst. In the presence of A1Et3, this catalyst catalyzed ethylene polymerization to obtain PE/CSs composites in situ. The catalytic activity for ethylene polymerization was up to 5.7 ×10^6 gPE/（molTi·h） and the weight average molecular weight of the obtained polymer was 4.9 × 10^5. As characterized by TEM and SEM,the particles of obtained composites were spherical with diameters of about 1 μm,furthermore,they featured a core-shell structure as expected. The dielectric analysis results indicated that compared with normal polyethylene, by the introduction of carbon nanospheres the PE/CSs composites dielectric properties experienced an obvious increase, which improved the anti-static function of PE. The dielectric result showed a slight decline of the dielectric constant of PE/CSs composites with increase of the polymerization time,and lower dielectric loss was also observed due to the decrease of CSs content in PE/CSs composites. Moreover, the crystalline properties and thermal stability of the PE/CSs composites were determined by WAXD, DSC and TGA. It turned out that PE/CSs composite possessed good crystalline properties and thermal stability.

关 键 词：碳纳米球 负载型Ziegler—Natta催化剂 聚乙烯 碳纳米球复合物 核·壳结构 

分 类 号：TB332[一般工业技术—材料科学与工程]