Summary The synthesis and phase behavior of three homopolymers with liquid crystalline side-chains is described. These new homopolymers show a dependence of the phase transition temperatures on the molecular weight. The synthesized... more
Summary The synthesis and phase behavior of three homopolymers with liquid crystalline side-chains is described. These new homopolymers show a dependence of the phase transition temperatures on the molecular weight. The synthesized material exhibits typical mesomorphism-nematic, smectic A and C. We compare the mesomorphic behavior of the homopolymers of the different liquid crystals polyacrylates. In addition, a dynamic and static
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Page 1. Polymer Bulletin 33, 203-208 (1994) Polymer Bulletin 9 Springer-Verlag 1994 Hydrogenation of styrene-butadiene rubber by hydrogen transfer from limonene Maria Lu|za Ambros yon Holleben*, Silvana M. Silva, and ...
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Page 1. Polymer Bulletin 33, 203-208 (1994) Polymer Bulletin 9 Springer-Verlag 1994 Hydrogenation of styrene-butadiene rubber by hydrogen transfer from limonene Maria Lu|za Ambros yon Holleben*, Silvana M. Silva, and ...
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Summary The synthesis and phase behavior of three homopolymers with liquid crystalline side-chains is described. These new homopolymers show a dependence of the phase transition temperatures on the molecular weight. The synthesized... more
Summary The synthesis and phase behavior of three homopolymers with liquid crystalline side-chains is described. These new homopolymers show a dependence of the phase transition temperatures on the molecular weight. The synthesized material exhibits typical mesomorphism-nematic, smectic A and C. We compare the mesomorphic behavior of the homopolymers of the different liquid crystals polyacrylates. In addition, a dynamic and static
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PET nanocomposites were prepared using montmorillonite with different organic modifiers (Cloisite® 15A, 30B and 10A). TEM, WAXD and DSC were used for the characterization. Nanocomposites of intercalated and exfoliated morphologies were... more
PET nanocomposites were prepared using montmorillonite with different organic modifiers (Cloisite® 15A, 30B and 10A). TEM, WAXD and DSC were used for the characterization. Nanocomposites of intercalated and exfoliated morphologies were obtained, and an average maximum distance between the platelets was observed in the intercalated morphology. The clay nucleated the PET crystallization process, and the nucleating effect was higher when
Research Interests: Engineering, Kinetics, Morphology, PET, Polymer, and 3 moreNanocomposite, CHEMICAL SCIENCES, and Exfoliation
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The complex [η3-methallyl-nickel-dad]PF6 is a new catalyst precursor for ethylene polymerization. The system is active in the presence of usual organoaluminium compounds like diethylaluminium chloride, at low Al/Ni ratios and under mild... more
The complex [η3-methallyl-nickel-dad]PF6 is a new catalyst precursor for ethylene polymerization. The system is active in the presence of usual organoaluminium compounds like diethylaluminium chloride, at low Al/Ni ratios and under mild reaction conditions (temperatures between −10°C and 25°C, ethylene partial pressure from 1 to 15 atm). The polymers show extensive methyl branching, whose content is controlled by reaction parameters like temperature and ethylene pressure.
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... Raquel Santos Mauler e Sonia Nachtigall Raquel Santos Mauler * e Sonia Nachtiga/l-UFRGS -Instituto de Química -Av. Bento Gonçalves, 9500 - CEP-91509-900-Porto Alegre, RS ( enviar correspondência para*). Polímeros: Ciência e Tecnologia... more
... Raquel Santos Mauler e Sonia Nachtigall Raquel Santos Mauler * e Sonia Nachtiga/l-UFRGS -Instituto de Química -Av. Bento Gonçalves, 9500 - CEP-91509-900-Porto Alegre, RS ( enviar correspondência para*). Polímeros: Ciência e Tecnologia - Out/Dez-93 ...
... However, an alternative method that has recently received attention consists in the use of a binary system where one catalyst produces 1-alkenes in situ and the another one polymerizes ethylene and incorporates the 1-alkene into the... more
... However, an alternative method that has recently received attention consists in the use of a binary system where one catalyst produces 1-alkenes in situ and the another one polymerizes ethylene and incorporates the 1-alkene into the growing chain [3]. This process has the ...
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Barbosa, RV, Baumhardt-Neto, R., Mauler, RS, Gorga, CJP and Tedesco, A.(2002), Use of pyrolyzed oil shale as filler in poly (ethylene-co-vinyl acetate) with different vinyl acetate contents. Journal of Applied Polymer Science, 84:... more
Barbosa, RV, Baumhardt-Neto, R., Mauler, RS, Gorga, CJP and Tedesco, A.(2002), Use of pyrolyzed oil shale as filler in poly (ethylene-co-vinyl acetate) with different vinyl acetate contents. Journal of Applied Polymer Science, 84: 15441555. doi: 10.1002/app. 10494
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The toughening of polypropylene [PP] with styrene–butadiene–styrene rubber [SBS]/montmorillonite [MMT] nanocomposites was investigated with respect to morphological, thermal, and mechanical properties. The MMT/SBS nanocomposites were... more
The toughening of polypropylene [PP] with styrene–butadiene–styrene rubber [SBS]/montmorillonite [MMT] nanocomposites was investigated with respect to morphological, thermal, and mechanical properties. The MMT/SBS nanocomposites were prepared in an internal mixer, using an epoxidized SBS [SBSe] to investigate its effect as a compatibilizer. The MMT/SBS nanocomposite was added to PP up to 10 wt%, aiming at material toughening. Transmission electron microscopy (TEM)
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... Email: Osvaldo L. Casagrande, Jr (osvaldo@iq.ufrgs.br). Publication History. ... On the other hand, at 30°C the productivity reaches a maximum of 8.19×10 3 kg of PE/mol[M]·h for x Zr = 0.67, indicating a non-linear correlation between... more
... Email: Osvaldo L. Casagrande, Jr (osvaldo@iq.ufrgs.br). Publication History. ... On the other hand, at 30°C the productivity reaches a maximum of 8.19×10 3 kg of PE/mol[M]·h for x Zr = 0.67, indicating a non-linear correlation between the productivity and x Zr . ...