紫外-可见光谱对<I>β</I>-二酮锆烯烃催化活性中心的研究

doi:10.3964/j.issn.1000-0593(2010)06-1566-04

Abstract
References
Related Citation (15)

Download: PDF (1626 KB)
Export: BibTeX | EndNote (RIS)

Abstract The method of UV/Visible absorption spectroscopy for olefin catalytic system was introduced in this paper, whose testing condition was much closer to the polymerization conditions. The actions of olefin polymerization catalyst (dbm)₂ZrCl₂ with cocatalyst AlEt₂Cl (or MAO) were investigated by UV/visible absorption spectroscopy at atmosphere temperature. It was shown that the UV/Visible main absorption band of the zirconocenium, which can be related to the ligand to metal charge transfer bands (LMCT), varies greatly upon incremental addition of AlEt₂Cl or MAO. For the low molar ratios of Al/Zr in the catalytic system, there was the substitution of an electron withdrawing chlorine atom by a donating alkyl group. Then a hypsochromic shift of the initial catalyst absorption band, corresponding to the monomethylation of the catalyst, was observed in each catalytic system (dbm)₂ZrCl₂/AlEt₂Cl (or (dbm)₂ZrCl₂/MAO). On the contrary, further addition of AlEt₂Cl (or MAO) was accompanied by a continuous bathochromic shift of the maximal wavelength, which corresponding to the formation of more dissociated ionic active species. Then, there would be a coordination of monomer to the ionic active species.

Key words：UV/Visible absorption spectroscopy;Active species;Olefin;Catalyst

Received: 2009-08-01 Accepted: 2009-11-06

ZTFLH:	O632.1
	O643.3

Corresponding Authors: LIU Bin-yuan E-mail: byliu@hebut.edu.cn

Cite this article:

YANG Min,WANG Lu-hai,LIU Pan-ge, et al. UV/Visible Spectroscopic Study of the β-Diketonate Zirconium Active Species for Olefin Polymerization [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(06): 1566-1569.

URL:

https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2010)06-1566-04 OR https://www.gpxygpfx.com/EN/Y2010/V30/I06/1566

[1] Coevoet D, Cramail H, Deffieux A. Macromol. Chem. Phys., 1998, 199: 1451.
[2] Coevoet D, Cramail H, Deffieux A. Macromol. Chem. Phys., 1998, 199: 1459.
[3] Pédeutour J-N, Coevoet D, Deffieux A, et al. Macromol. Chem. Phys., 1999, 200: 1215.
[4] Peruch F, Cramail H, Deffieux A. Macromolecules, 1999, 32: 7977.
[5] Ferreira M L, Belelli P G, Damiani D E. Macromol. Chem. Phys., 2001, 202: 495.
[6] Pédeutour J-N, Radhakrishnan K, Cramail H, et al. Macromol. Rapid. Commun., 2001, 22: 1095.
[7] Dalet T, Cramail H, Deffieux A. Macromol. Chem. Phys., 2004, 205: 1394.
[8] Wieser U, Schaper F, Brintzinger H-H. Macromol. Symp., 2006, 236: 63.
[9] Tritto I, Li S X, Sacchi M C, et al. Macromolecules, 1993, 26: 7111.
[10] Tritto I, Li S X, Sacchi M C, et al. Macromolecules, 1995, 28: 5358.
[11] Tritto I, Donetti R, Sacchi M C, et al. Macromolecules, 1999, 32: 264.
[12] LUO He-kuan, YANG Zhi-hong, MAO Bing-quan, et al(罗河宽, 杨志洪, 毛炳权, 等). Acta Polymerica Sinica(高分子学报), 2001, (6): 720.
[13] HU Jun-fu(胡军福). Chinese Journal of Spectroscopy Laboratory(光谱实验室), 2006, 23: 1026.
[14] LIANG Guang, LIU Wei-ping, PU Shao-ping, et al(梁广，刘伟平，普绍平, 等). Precious Metals (贵金属), 2004, 25: 12.
[15] FAN Rui-lan, BAO Feng-rong, WANG Yong-sheng (范瑞兰, 宝凤荣, 王永升). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2005, 25(4): 601.
[16] YAN Wei-dong, HONG Han, ZHOU Nai, et al(闫卫东, 洪翰, 周鼐, 等). Acta Polymerica Sinica(高分子学报), 2000, (3): 358.
[17] Wang J, Liu Z Y, Wang D, et al. Polymer International, 2000, 49: 1665.
[18] YANG Min, SHEN Xiao-li, JI Rong-qin, et al(杨敏, 沈小莉, 姬荣琴, 等). Polymer Materials Sciences and Engineering(高分子材料科学与工程), 2005, 21: 103, 109.
[19] YANG Min, YAN Wei-dong, HAO Xiao-yu, et al. Macromolecules, 2009, 42: 905.
[20] LI Run-qing, FAN Guo-liang, QU Rong-lin(李润卿, 范国梁, 渠荣遴). Spectral Analysis of Organic Structures(有机结构波谱分析). Tianjin: Tianjin University Press(天津: 天津大学出版社), 2002. 12.