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Rheological and thermal properties of ethylene–styrene copolymers
Author(s) -
Marques Maria de Fátima Vieira,
de Moraes Luanda Silva
Publication year - 2008
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21179
Subject(s) - comonomer , materials science , polyethylene , copolymer , methylaluminoxane , ethylene , polymer chemistry , rheology , differential scanning calorimetry , rheometer , styrene , polymer , metallocene , polymerization , composite material , chemical engineering , catalysis , organic chemistry , thermodynamics , chemistry , engineering , physics
The metallocene compounds Ph 2 C(Flu,Cp)ZrCl 2 (cat 1) and Et(Flu) 2 ZrCl 2 (cat 2) activated with methylaluminoxane (MAO) were evaluated on ethylene and styrene copolymerization. The comonomer concentration (2.2 M), polymerization temperature (80°C), and ethylene concentration (0.135 M) were maintained constant in the reaction medium. The materials were evaluated in a differential scanning calorimeter (DSC), in a rheometer with parallel plate geometry, and their specific gravities were determined. The copolymer obtained with the catalyst 1 was amorphous; however, that obtained with the catalyst 2 at the same reaction conditions presented melting temperature lower than that of polyethylene. For the rheological measurements, the TA Instruments Rheometer AR 2000 employing dynamic experiments at 190°C was used. The rheological analyses indicated that the obtained polymers presented pseudoplastic behavior in the whole studied frequency range. The behavior of the synthesized copolymers was compared with that of the polyethylene obtained at the same reaction conditions. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers