Functionalized multi-walled carbon nanotubes with stereospecific Ziegler-Natta catalyst species: Towards facile in situ preparation of polypropylene nanocomposites
Functionalized multi-walled carbon nanotubes with stereospecific Ziegler-Natta catalyst species: Towards facile in situ preparation of polypropylene nanocomposites
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具有立体定向齐格勒-纳塔催化剂的功能化多壁碳纳米管：轻松原位制备聚丙烯纳米复合材料
DOI：
10.1016/j.apcata.2012.05.041
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发表时间：
2012-09
期刊：
影响因子：
--
通讯作者：
Wang, Yuexin
中科院分区：
文献类型：
--
作者：
Wang, Ning;Qin, Yawei;Huang, Yingjuan;Niu, Hui;Dong, Jin-Yong;Wang, Yuexin
采用立体定向Ziegler-Natta催化剂对多壁碳纳米管(MWCNTs)进行官能化处理，原位制备了PP/MWCNT纳米复合材料。官能化过程首先用过量的格氏试剂处理含有少量(∼3.0%w/w)表面羟基的多壁碳纳米管，然后再与四氯化钛反应。以三乙基铝(TEA)为助催化剂，二甲氧基二苯基硅烷(DDS)为外给电子体。得到的多壁碳纳米管(MWCNT/mg/Ti)只能起到等规度Ziegler-Natta催化剂的作用，以中等速率促进丙烯聚合，得到中等等规度指数(76.4-91.0%)的PP。为了提高催化性能，在MWCNT功能化过程中加入了给电子剂9，9-二(甲氧基甲基)氟(BMMF)，将BMMF引入到催化材料中，同时减少了TiCl4的固载量。BMMF功能化的多壁碳纳米管(MWCNT/mg/BMMF/Ti)无需外给电子体即可制得等规度指数较高的PP(92.0%)。当聚合过程中以DDS为外给电子体时，可得到等规度指数大于98%的PP。
Multi-walled carbon nanotubes (MWCNTs) were functionalized with a stereospecific Ziegler-Natta catalyst species for in situ preparation of polypropylene (PP)/MWCNT nanocomposites. The functionalization process involved initially treating MWCNTs containing a few (∼3.0% w/w) surface hydroxyl groups (MWCNT-OH) with an excess amount of Grignard reagent followed by further reaction with TiCl4. Triethylaluminum (TEA) and dimethoxydiphenylsilane (DDS) were used as co-catalyst and external electron donor, respectively. The resulting MWCNTs (MWCNT/Mg/Ti) only behaved as a fair isospecific Ziegler-Natta catalyst, promoting propylene polymerization at a moderate rate and resulting in PP with moderate isotacticity indices (76.4–91.0%). To improve the catalytic performance, the electron-donating reagent 9,9-bis(methoxymethyl)fluorine (BMMF) was added into the MWCNT functionalization process, incorporating BMMF into the catalytic material and simultaneously reducing the quantity of TiCl4immobilization. The BMMF-incorporated functionalized MWCNTs (MWCNT/Mg/BMMF/Ti) produced PP with a high isotacticity index (92.0%) without the use of an external electron donor. PP with an isotacticity index greater than 98% was achieved when DDS was used as external electron donor during the polymerization process.
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影响因子：
9.1
作者：
Hong, Chang-Eui;Lee, Joong-Hee;Advani, Suresh G.
通讯作者：
Advani, Suresh G.
影响因子：
5.5
作者：
Jong-Ill Lee;S. Yang;Hee‐Tae Jung
通讯作者：
Jong-Ill Lee;S. Yang;Hee‐Tae Jung
DOI：
10.1002/chin.200308223
发表时间：
2003-02
期刊：
ChemInform
影响因子：
--
作者：
R. Andrews;D. Jacques;D. Qian;T. Rantell
通讯作者：
R. Andrews;D. Jacques;D. Qian;T. Rantell
影响因子：
3
作者：
X. Tong;Chang Liu;Hui‐Ming Cheng;Haichao Zhao;Feng Yang;Xuequan Zhang
通讯作者：
X. Tong;Chang Liu;Hui‐Ming Cheng;Haichao Zhao;Feng Yang;Xuequan Zhang
影响因子：
--
作者：
Kaminsky, W.;Funck, A.;Wiemann, K.
通讯作者：
Wiemann, K.