writer：He-xin Zhang,1 Myung-sung Jung,1 Young-jun Shin,2 Keun-byoung Yoon,1 Dong-ho Lee
keywords：copolymerization; nanocomposite; ethylene; POSS; hybrid
source：期刊
specific source：Journal of Applied Polymer Science, Vol. 111, 2697–2702 (2009)
Issue time：2009年

The various monovinyl-functional polyhedral oligomeric silsesquioxane (POSS) monomers had been copolymerized with ethylene (E) using rac-Et(Ind)2ZrCl2 and a modified methylaluminoxane (MMAO) cocatalyst. The unreacted POSS monomer could be removed completely by washing the copolymerization product with n-hexane. And the copolymers were characterized with 1H NMR, TEM, DSC, TGA, and GPC to know the composition, thermal properties, molecular weight and its distribution, respectively. According to 1H NMR data, the monomer reactivity ratios of various POSS monomers were calculated by the Fineman-Ross and Kelen-Tudos methods. 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 thermally robust.