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Systematic Study of Fluorine Effect on
增强出版α -Ketiminato Nickel Catalyzed Ethylene (Co)Polymerization- Acta Polymerica Sinica Vol. 52, Issue 5, Pages: 531-540(2021)
- 作者机构：
中国科学院长春应用化学研究所 高分子物理与化学国家重点实验室 长春 130022
- 作者简介：
- 基金信息：
DOI：10.11777/j.issn1000-3304.2020.20282
CLC：Published：3 May 2021，
Published Online：3 February 2021，
Received：23 December 2020，
Revised：5 January 2021，
扫 描 看 全 文
Lei Cui, Xiao-qiang Hu, Yi-xin Zhang, Zhong-bao Jian. Systematic Study of Fluorine Effect on
α -Ketiminato Nickel Catalyzed Ethylene (Co)Polymerization. [J]. Acta Polymerica Sinica 52(5):531-540(2021)Lei Cui, Xiao-qiang Hu, Yi-xin Zhang, Zhong-bao Jian. Systematic Study of Fluorine Effect on
α -Ketiminato Nickel Catalyzed Ethylene (Co)Polymerization. [J]. Acta Polymerica Sinica 52(5):531-540(2021) DOI： 10.11777/j.issn1000-3304.2020.20282.
摘要
相比于烯烃聚合过渡金属催化剂的空间位阻与电子效应，氟效应是一种简单且有效调控烯烃聚合反应的重要方法，但研究却相对较少. 在本工作中，通过把不同位置(邻、间、对)和不同数目(0、1、2、3、5)的氟原子引入到N
O配位型的单组分阳离子酮亚胺镍催化剂中，系统地考察了氟效应对乙烯聚合反应的催化活性、催化剂热稳定性、聚合物分子量以及聚合物支化度的全面影响. 发现邻位氟取代基有利于聚合物分子量的显著提高，而间位与对位氟取代基导致聚合活性下降；特别是全氟取代基不仅造成催化剂热稳定性的下降，同时导致聚合活性与聚合物分子量的大幅下降. 在乙烯与丙烯酸甲酯的共聚合研究中，无氟取代的镍催化剂出现失活，但邻氟取代的镍催化剂则表现出聚合活性以及赋予共单体插入率，这些行为在长链极性单体共聚中表现更加优异. 本工作有助于理解氟效应在烯烃聚合中的重要作用.
Abstract
Compared with steric bulk and electronic effect in transition metal catalysts for olefin coordination-insertion polymerization
fluorine effect is one facile and effective method for modulating olefin polymerization reaction. However
study on fluorine effect in late transition metal catalysts is relatively less. In this contribution
by installation of fluorine atoms with different sites and numbers into N
O-type single-component cationic
α
-ketiminato nickel catalysts
fluorine effect on ethylene polymerization properties was comprehensively investigated
including catalytic activity
thermal stability of catalyst
polymer molecular weight
and branching density. These new nickel catalysts were fully identified by
1
H-NMR and
13
C-NMR spectroscopy
elemental analysis
and X-ray diffraction analysis. It was fully found that the
ortho
-fluorinated substituent in the nickel catalyst obviously favoured the enhancement of polymer molecular weight (weight-average molecular weight (
M
w
): up to 26.2×10
4
g·mol
−1
)
but the
meta
- and
para
-fluorinated substituents in the nickel catalysts reduced the catalytic activity; especially the perfluorinated substituent in the nickel catalyst not only decreased the thermal stability of catalyst
but also led to the drop of activity and molecular weight. It was completely different from the previously reported effect of fluorine on these catalytic systems such as fluorinated phenoxy-imine nickel and titanium catalysts. Notably
the non-fluorinated nickel catalyst was inactive for the copolymerization of ethylene and methyl acrylate (MA)
but the
ortho
-fluorinated nickel catalyst showed activity and enabled the incorporation of comonomer (0.9 mol%)
albeit with low activity. However
the
ortho
-fluorinated nickel catalyst was also inactive for other more challenging monomers such as methyl methacrylate (MMA)
acrylic acid (AA)
vinyl acetate (VA) and
n
-butyl vinyl ether (BVE). As expected
the long chain polar monomers such as 6-chlorohex-1-ene
methyl 10-undecenoate (UA)
undecenoic acid (UCOOH) and 10-undecen-1-ol (UOH) exhibited better copolymerization behaviors using the
ortho
-fluorinated nickel catalyst. This work will help the community to understand the crucial role of fluorine effect in olefin polymerization.
关键词
氟效应烯烃聚合后过渡金属催化剂极性单体酮亚胺
Keywords
Fluorine effectOlefin polymerizationLate transition metal catalystsPolar monomersImino-ketone
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