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PE/OMMT nanocomposites prepared by in situ polymerization approach: Effects of OMMT-intercalated catalysts and silicate modifications

机译:通过原位聚合方法制备的PE / OMMT纳米复合材料:OMMT插层催化剂和硅酸盐改性的影响

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In this article, the surfactants, (2-hydroxylethyl) octadecyl dimethylammonium nitrate (OH-C18), hexadecyltrimethylammonium bromide(C16), and mixture of trimethylchlorosilane (TM) and OH-C18 were ion-exchanged with cations in the montmorillonite (MMT) to generate three organic MMTs (named as OH-C18-MMT, C16-MMT, and MMMT), leading to different environments of catalyst species in MMT interlayer gallery. Et[Ind] _2ZrCl _2 (abbreviated as EI) was supported on the above three types of OMMTs to prepare the PE/OMMT nanocomposites via in situ polymerization. By contrast, EI/MMMT showed higher activity than EI/OH-C18-MMT and EI/C16-MMT under the same polymerization conditions. The other two types of catalysts, such as [(tert-Bu)NSi(Me _2)C _5Me _4]TiCl _2 (CGCT) and Bis[N-(3-tert-butylsalicylidene)anilinato] titanium (IV) dichloride (FI) were also supported on the OH-C18-MMT for in situ ethylene polymerization. It was found that the activity of FI/OH-C18-MMT for ethylene polymerization was much lower than the other two corresponding catalysts under the similar reaction conditions.
机译:在本文中,将表面活性剂,(2-羟乙基)十八烷基二甲基硝酸铵(OH-C18),十六烷基三甲基溴化铵(C16)以及三甲基氯硅烷(TM)和OH-C18的混合物与蒙脱土(MMT)中的阳离子进行离子交换生成三种有机MMT(分别称为OH-C18-MMT,C16-MMT和MMMT),从而导致MMT夹层廊道中催化剂种类的环境不同。将Et [Ind] _2ZrCl _2(缩写为EI)负载在上述三种类型的OMMT上,通过原位聚合制备PE / OMMT纳米复合材料。相反,在相同的聚合条件下,EI / MMMT的活性高于EI / OH-C18-MMT和EI / C16-MMT。其他两种催化剂,例如[((叔丁基)NSi(Me _2)C _5Me _4] TiCl _2(CGCT)和双[N-(3-叔丁基水杨基)苯胺基]二氯化钛(IV)(FI )也负载在OH-C18-MMT上进行原位乙烯聚合。发现在相似的反应条件下,FI / OH-C18-MMT对乙烯聚合的活性远低于其他两种相应的催化剂。

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