A Comparative Study on the Homo-, Co- and Ter-Polymerization Using Ethylene, 1-Decene and p-Methylstyrene

Abstract

Abstract:We synthesized polyethylene (PE), poly(ethylene-co-1-decene), poly (ethyleneco-p-methylstyrene) and poly(ethylene-ter-1-decene-ter-p-methystyrene) using a rac-Et(Ind) 2 ZrCl 2 metallocene catalyst and a methylaluminoxane cocatalyst system. The materials were characterized using nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy. We compared and studied the kinetics, thermal properties and mechanical ones of these polymers. T g was related to the amorphous phase of the polymers, whereas the tensile strength and storage modulus (E') were related to the crystalline phase. We also found that PE has the highest crystallinity through differential scanning calorimetry and wide-angle X-ray scattering analysis. The polymerization rates of poly(ethylene-co-1-decene) and poly(ethylene-ter-1-decene-ter-p-methystyrene) were always higher than that of polyethylene.

Synthesis of novel copolymers based on p-methylstyrene, N,N-butylvinylimidazolium and polybenzimidazole as highly conductive anion exchange membranes for fuel cell application

“…Both the glass transitions of pure poly(p-methylstyrene) around 110 C (ref. 32) and ranges from 66 to 105 C when the poly(p-methylstyrene) is copolymerized; 33 and the one of imidazolium (that ranges from 90 to 170 C) 34 can't be observed in these thermograms because the enthalpy of the rst peak at 100 C-due to the evaporation of residual water and the melting of p-methylstyrene in the copolymer 35 -is higher enough to decline both of them. Or a tertiary blend presents only a single glass transition and in this case we assume that this copolymerization could achieve one phase blend.…”