Journal of Macromolecular Science, Part A ( IF 2.5 ) Pub Date : 2021-02-24 , DOI: 10.1080/10601325.2021.1889379 Mohammad Hossein Jandaghian 1, 2 , Yasaman Maddah 1, 2 , Ehsan Nikzinat 1, 2 , Maryam Masoori 2 , Abdolhannan Sepahi 2 , Reza Rashedi 1, 2 , Saeed Houshmandmoayed 2 , Razieh Davand 2 , Kamal Afzali 2
Abstract
Although Ziegler-Natta catalysts were discovered more than four decades ago, many aspects of their characteristics are not fully understood. The effect of the support particle size on the final properties and performance of these catalysts is one of them. In this article, we present the effect of milling and heat-treating the Mg(OEt)2 support on the properties of the final catalysts and subsequently the resulting co-polymer powders. It was found that while the support milling has no significant effect on the elemental analysis results of the catalysts, the catalysts made by the milled and not-milled supports show a clear difference between the activity, particle size, and particle size distribution of the catalysts. On the other hand, the morphology of the catalyst pores is very sensitive to support manipulation, and bottleneck-type pores are predominant in the catalysts made by the nonmanipulated supports. Finally, it was found that the incorporation and the distribution of co-monomers in the final polymer chains depend on the manipulation of the raw support, and the use of milled and heat-treated supports results in the formation of co-monomer-sensitive catalysts.
中文翻译:
Mg(OEt)2操作对齐格勒-纳塔催化剂乙烯和1-丁烯共聚性能影响的研究
摘要
尽管齐格勒-纳塔催化剂是在四十多年前发现的,但其特性的许多方面尚未完全了解。载体粒度对这些催化剂的最终性质和性能的影响就是其中之一。在本文中,我们介绍了研磨和热处理 Mg(OEt) 2 的效果支持最终催化剂的性能,以及随后得到的共聚物粉末。发现虽然载体研磨对催化剂的元素分析结果没有显着影响,但由研磨和未研磨载体制成的催化剂在催化剂的活性、粒径和粒径分布方面表现出明显的差异。 . 另一方面,催化剂孔隙的形态对载体操纵非常敏感,在由非操纵载体制成的催化剂中,瓶颈型孔隙占主导地位。最后,发现共聚单体在最终聚合物链中的掺入和分布取决于原始载体的操作,并且使用研磨和热处理的载体导致共聚单体敏感催化剂的形成.