Copolymerization of β-Pinene and Norbornene with 2-Aminopyridine Nickel(Ⅱ) Complexes/MAO Catalysts

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (6): 1257.

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Copolymerization of β-Pinene and Norbornene with 2-Aminopyridine Nickel(Ⅱ) Complexes/MAO Catalysts

HUANG Zeng-Fang^1,2, GAO Hai-Yang¹, WU Qing^1*

1. Key Laboratory of Designed Synthesis and Application of Polymer Materials of Guangdong Higher Education Institues, Key Laboratory for Polymeric Composite and Functional Materierls of Ministry of Education, School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275, China;
2. Zhongshan Institute, University of Electronic Science & Technology, Zhongshan 528402, China

Received:2009-09-30 Online:2010-06-10 Published:2010-06-10
Contact: Wu Qing. E-mail: ceswuq@mail.sysu.edu.cn
Supported by:
国家自然科学基金(批准号: 20734004)、广东省自然科学基金(批准号: 8251027501000018, 9452840301003542)、中山市科技计划项目(批准号: 20092A203)和电子科技大学中山学院科研启动基金(批准号: 408YKQ04)资助.

Abstract

Abstract:

In the presence of methylaluminoxane(MAO), 2-aminopyridine Ni(Ⅱ) complexes [(2-PyCH₂NAr)NiBr, Ar=2,6-dimethylphenyl(a), 2,6- diisopropylphenyl(b), 2,6-difluorophenyl(c)] presented highly catalytic activity for the copolymerizations of β-pinene and norbornene and afforded the copolymers with broad molecular weight distribution(PDI≈3.7—5.5). Complex c exhibited highest catalytic activity for the copolymerization under same conditions.After being extracted by CHCl₃ and THF, the crude product could be divided into two fractions with narrow molecular weight distribution(PDI≈2.0), CHCl₃-soluble but THF-insoluble fraction and THF-soluble fraction. The former contains high norbornene content(x_N＞90%) with higher molecular weight and the latter contains high β-pinene content with lower molecular weight, indicating that there exist two kinds of catalytic species in the copolymerization systems. The TGA analyses of the copolymers show that there are two thermal decomposition stages, and the loss of mass in the low thermal decomposition temperature stage decreases with an increase of norbornene content in the copolymer.

Key words: 2-Aminopyridine; Nickel(Ⅱ) complex; β-Pinene; Norborene; Copolymerization

TrendMD:

HUANG Zeng-Fang, GAO Hai-Yang, WU Qing*. Copolymerization of β-Pinene and Norbornene with 2-Aminopyridine Nickel(Ⅱ) Complexes/MAO Catalysts[J]. Chem. J. Chinese Universities, 2010, 31(6): 1257.

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Copolymerization of β-Pinene and Norbornene with 2-Aminopyridine Nickel(Ⅱ) Complexes/MAO Catalysts

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