Synthesis and Properties of Ethylene-polyhedral Oligomeric Silsesquioxane Copolymer with Bis(cyclopentadienyl) Zirconium Dichloride Catalyst

doi:10.3969/j.issn.0251-0790.2012.08.038

Abstract

Abstract: An organic/inorganic hybrid copolymer was prepared with a bis (cyclopentadienyl) zirconium dichloride (Cp₂ZrCl₂) in conjunction with modified methylaluminoxane (MMAO) cocatalyst. Two kinds of monovinyl substituted polyhedral oligomeric silsesquioxane(POSS) monomers were used to copolymerize with ethylene(E). The copolymers were characterized with ¹H NMR, DSC, TGA and GPC to know the composition, thermal properties, molecular weight and its distribution, respectively. The comonomer content (POSS) was in the range of 0.01%-0.30%(molar fraction). With the increase of POSS content in copolymer, the melting temperature and heat of fusion decreased. Thermogravimetric analysis of E/POSS copolymers exhibited an improved thermal stability with a higher degradation temperature and char yields, demonstrating that the inclusion of inorganic POSS nanoparticles made the organic polymer matrix more thermal robust. Increasing the feed ratio of POSS, the molecular weight increased, while the molecular weight distribution broadened.

Key words: Hybrid copolymer, Copolymerization, Nanocomposite, Ethylene, Polyhedral oligomeric silsesquioxane(POSS), bis(cyclopentadienyl) zirconium dichloride(Cp₂ZrCl₂) catalyst

CLC Number:

O632.12

TrendMD:

ZHANG He-Xin, ZHANG Hao, ZHANG Chun-Yu, HAO Xiu-Feng, ZHANG Xue-Quan. Synthesis and Properties of Ethylene-polyhedral Oligomeric Silsesquioxane Copolymer with Bis(cyclopentadienyl) Zirconium Dichloride Catalyst[J]. Chem. J. Chinese Universities, 2012, 33(08): 1850.

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