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Your search keyword '"Regina C. R. Nunes"' showing total 2 results
Start Over Author "Regina C. R. Nunes" Publisher american chemical society (acs)
2 results on '"Regina C. R. Nunes"'

1. Dynamics of Natural Rubber as a Function of Frequency, Temperature, and Pressure. A Dielectric Spectroscopy Investigation

Author

Maria J. Sanchis, Leila L. Y. Visconte, George Floudas, Regina C. R. Nunes, P. Ortiz-Serna, Ricardo Díaz-Calleja, and Agnes F. Martins

Subjects
Materials science, Polymers and Plastics, biology, Organic Chemistry, Analytical chemistry, biology.organism_classification, Dielectric spectroscopy, Inorganic Chemistry, Temperature and pressure, Differential scanning calorimetry, Natural rubber, visual_art, Materials Chemistry, visual_art.visual_art_medium, Hevea brasiliensis
Abstract

Natural rubber (NR) isolated from Hevea Brasiliensis was investigated by differential scanning calorimetry, dielectric spectroscopy, and high-pressure dielectric spectroscopy. In the range of frequ...

Published
2010

2. Equilibrium and Dynamic Conformational Studies on Model Compounds of Side Groups of Polymer Chains with a Potential Capability To Develop Mesomorphic Order

Author

Mauricio R. Pinto, Enrique Saiz, Regina C. R. Nunes, and Evaristo Riande

Subjects
chemistry.chemical_classification, Polymers and Plastics, Stereochemistry, Organic Chemistry, Polymer, Atmospheric temperature range, Inorganic Chemistry, Crystallography, Molecular dynamics, Dipole, chemistry, Liquid crystal, Materials Chemistry, Side chain, Order (group theory), Time curve
Abstract

Experimental values of the mean-square dipole moments are reported for [4-(acetyloxy)phenyl](4-chlorophenyl)methanone (ACM), bis[4-(acetyloxy)phenyl]methanone (BACM), and 4-chlorophenyl 4-(acetyloxy)benzoate (CAB), in the temperature range 30-60°C. The values of at 30°C amount to 16.83, 11.17, and 14.37 D 2 for CAB, ACM, and BACM, respectively. The time evolution of the dipole moment of these compounds and that of [4-(acetyloxy)phenyl]phenylmethanone was followed by molecular dynamics (MD) simulations, and the results for and were obtained by averaging these quantities in the whole MD trajectory. In general, good agreement between theory and experiment was found

Published
1995

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