In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts

doi:10.1039/c7ra01249g

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	In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts
	Guo HL(郭慧龙); Guo, HL; Wu QY(吴群燕); Wang JY(王佳怡); Shi WQ(石伟群); Wu ZH(吴忠华); Bi, JF; Wu, QY; Wang, JY; Shi, WQ; Zhang, XQ; Jiang, SC; Wu, ZH
	2017
发表期刊	RSC ADVANCES (IF:3.108[JCR-2016],3.257[5-Year])
ISSN	2046-2069
卷号	7 期号:24 页码:14413-14421
文章类型	Article
摘要	Nd-based ternary catalysts are widely used for the polymerization of isoprene in rubber industry, however structure information during the polymerization of isoprene as well as the catalytic mechanism are still ambiguous. In this paper, the in situ XAFS technique was used to extract the local atomic structure around the Nd center of the catalyst consisting of Nd(vers)(3), AlEt3, and Al(Bu-i)(2)Cl. Theoretical calculations were used to verify the structure changes in the alkylation process. Four catalysts with different alkylaluminums {AlEt3, Al((n)Oct)(3), Al(Bu-i)(3), and Al(Bu-i)(2)H} were, respectively, used for the polymerization of isoprene. The results demonstrate that the substitution of Nd-C for Nd-O bonds is reasonable in the alkylation step. The structural evolutions in the alkylation and chlorination steps, as well as in the polymerization processes of isoprene are all similar for these Nd-based ternary catalysts with different alkylaluminum components. In the polymerization process of isoprene, there are only about 2 Nd-Cl bonds at 2.85 angstrom and 1-2 Nd-C bonds at 2.42 angstrom around the Nd centers which are in a monomer state. The Nd-C bonds can be attributed to the contribution of isoprene. This highly-opened structure of the Nd active centers activates greatly the catalytic activity of the Nd-based ternary catalysts. A conjectural catalytic mechanism for the polymerization of isoprene has been deciphered on the basis of the in situ XAFS results. This study is expected to be helpful for the improvement and application of the Nd-based ternary catalysts.
DOI	10.1039/c7ra01249g
关键词[WOS]	NEODYMIUM-BASED CATALYST ; RING-OPENING POLYMERIZATION ; BUTADIENE POLYMERIZATION ; SPECTROSCOPIC METHODS ; DIENE POLYMERIZATION ; 1,3-BUTADIENE ; COMPLEXES ; REACTIVITY ; SYSTEMS ; ACID
收录类别	SCI ; ADS ; EI ; SCOPUS
语种	英语
WOS研究方向	Chemistry
WOS类目	Chemistry, Multidisciplinary
WOS记录号	WOS:000396150900015
EI入藏号	20171103434237
EI主题词	Alkylation - Catalysis - Catalyst activity - Chlorine compounds - Isoprene - Neodymium - Polymerization - Rubber industry - X ray absorption
EI分类号	547.2 Rare Earth Metals - 711 Electromagnetic Waves - 802.2 Chemical Reactions - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 804.1 Organic Compounds - 815.2 Polymerization - 818.4 Rubber Factories and Machinery
ADS Bibcode	2017RSCAd...714413G
ADS URL	https://ui.adsabs.harvard.edu/abs/2017RSCAd...714413G
ADS引文	https://ui.adsabs.harvard.edu/abs/2017RSCAd...714413G/citations
引用统计	正在获取... 被引频次：0 [ADS]
文献类型	期刊论文
条目标识符	https://ir.ihep.ac.cn/handle/311005/285182
专题	多学科研究中心
作者单位	中国科学院高能物理研究所
第一作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Guo HL,Guo, HL,Wu QY,et al. In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts[J]. RSC ADVANCES,2017,7(24):14413-14421.
APA	郭慧龙.,Guo, HL.,吴群燕.,王佳怡.,石伟群.,...&Wu, ZH.(2017).In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts.RSC ADVANCES,7(24),14413-14421.
MLA	郭慧龙,et al."In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts".RSC ADVANCES 7.24(2017):14413-14421.

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