Study on the Organometallic [N,P] Titanium Catalysts for Ethylene Polymerization without Cocatalyst

Zi-hai Shi; Jiao-jiao Zhang; Ding-kun Yuan; Shao-meng Zhang; Xiao-qi Xia; Ke-jing Gao; Hong-ming Li; Qiu-can Wang; Jian-jun Yi; Qi-gu Huang; Zhong Zhao

doi:10.11777/j.issn1000-3304.2020.20098

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Study on the Organometallic [N,P] Titanium Catalysts for Ethylene Polymerization without Cocatalyst

更新时间：2021-01-26

- Study on the Organometallic [N,P] Titanium Catalysts for Ethylene Polymerization without Cocatalyst
- Acta Polymerica Sinica Vol. 51, Issue 12, Pages: 1374-1384(2020)
- 作者机构：
  
  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材料科学与工程学院　北京 100029
  2.中国石油石油化工研究院　北京 102206
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2020.20098
  CLC：
- Published：21 October 2020，
  
  Published Online：20 July 2020，
  
  Received：10 April 2020，
  
  Revised：11 May 2020，
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Zi-hai Shi, Jiao-jiao Zhang, Ding-kun Yuan, Shao-meng Zhang, Xiao-qi Xia, Ke-jing Gao, Hong-ming Li, Qiu-can Wang, Jian-jun Yi, Qi-gu Huang, Zhong Zhao. Study on the Organometallic [N,P] Titanium Catalysts for Ethylene Polymerization without Cocatalyst. [J]. Acta Polymerica Sinica 51(12):1374-1384(2020)
DOI：

Zi-hai Shi, Jiao-jiao Zhang, Ding-kun Yuan, Shao-meng Zhang, Xiao-qi Xia, Ke-jing Gao, Hong-ming Li, Qiu-can Wang, Jian-jun Yi, Qi-gu Huang, Zhong Zhao. Study on the Organometallic [N,P] Titanium Catalysts for Ethylene Polymerization without Cocatalyst. [J]. Acta Polymerica Sinica 51(12):1374-1384(2020) DOI： 10.11777/j.issn1000-3304.2020.20098.

摘要

软硬酸碱理论(HSAB)是由Pearson根据Lewis酸碱电子理论提出来的一种新的酸碱理论，可以用于解释各种化学反应，尤其是在配位化学方面有着较好的应用. 本文合成了6种含有不同结构的新型[N

P]型Ti系催化剂，在不添加助催化剂的条件下催化乙烯聚合，还探讨了乙烯聚合条件，催化剂Cat.

的催化活性可达2.83 × 10

∙(mol

)

−1

∙h

−1

，得到的聚乙烯的分子量为8.6 × 10

g/mol. 6种催化剂催化乙烯聚合所得聚乙烯的分子量分布在2.2 ~ 2.5，熔点均在135 °C左右. 采用HSAB理论对配体、配体与Ti

的反应，以及乙烯单体与催化剂之间的软硬酸碱匹配性进行了探讨，发现与Me和H比较，配体苯胺苯环上取代基为吸电子基团时，得到的聚乙烯分子量更高，催化活性也较高. 密度泛函理论(DFT)计算表明，乙烯单体更容易从中心金属原子的左边与M―C键进行配位、插入反应，Cat.

进行乙烯插入时的能垒较低，较易进行乙烯的配位、插入，配体苯胺苯环上引入吸电子基团有利于催化剂活性中心的稳定，获得更高分子量的聚乙烯. 实验数据与软硬酸碱理论和密度泛函理论分析结果接近.

Abstract

The soft and hard acid-base theory (HSAB) is a new acid-base theory created by Sir. Pearson based on the theory of Lewis acid-base electron. It can be used to explain various chemical reactions

especially in coordination chemistry. In this study

the synthesized Cat.

− Cat.

P]Ti catalysts containing ligands with electron withdrawing groups were prepared for ethylene polymerization without the addition of cocatalyst. The other optimal conditions for ethylene polymerization were determined through optimizing the polymerization behavior. Cat.

with ligand L5 containing tetrafluorobenzene ring showed a catalytic activity of to 2.83 × 10

∙(mol

)

−1

∙h

−1

for this polymerization. The obtained polyethylene featured high weight average molecular weight of 8.6 × 10

g/mol. The molecular weight distribution of polyethylene obtained by these six catalysts were in 2.2 − 2.5

and the melting point was about 135 °C The reaction mechanism of ethylene polymerization was explored by HSAB. The results showed that when the substituent on the catalyst aniline was an electron withdrawing group

both the polymerization activity and the molecular weight of the obtained polymer were higher. Density Functional Theory (DFT) results indicated that ethylene was more inclined to react with one of the M―C bonds of the catalyst. The energy barrier for the ethylene insertion reaction by Cat.

was the lowest

compared to other catalysts except Cat.

which made ethylene insertion reaction easier. These ligands containing electron withdrawing groups on aniline ring made the catalytic active species more stable. Much higher molecular weight of polyethylene was produced by utilizing these catalysts with the ligands containing electron withdrawing groups on aniline ring. These experimental results were consistent with those of HSAB and DFT.

关键词

[NP]催化剂无助催化剂乙烯聚合软硬酸碱理论密度泛函理论

Keywords

[NP]Ti catalystsWithout cocatalystEthylene polymerizationSoft and hard acid-base theoryDensity functional theory

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Department of Polymer Science and Engineering, University of Science and Technology of China

Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences

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