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18 results on '"Reyes-Mayer, Adriana"'

5. Towards a Circular Economy of Plastics: An Evaluation of the Systematic Transition to a New Generation of Bioplastics

Author

Melchor-Martínez, Elda M., primary, Macías-Garbett, Rodrigo, additional, Alvarado-Ramírez, Lynette, additional, Araújo, Rafael G., additional, Sosa-Hernández, Juan Eduardo, additional, Ramírez-Gamboa, Diana, additional, Parra-Arroyo, Lizeth, additional, Alvarez, Abraham Garza, additional, Monteverde, Rosina Paola Benavides, additional, Cazares, Karen Aleida Salazar, additional, Reyes-Mayer, Adriana, additional, Yáñez Lino, Mauricio, additional, Iqbal, Hafiz M. N., additional, and Parra-Saldívar, Roberto, additional

Published
2022
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10. SÍNTESIS Y CARACTERIZACIÓN DE PARTÍCULAS DE PLATA OBTENIDAS MEDIANTE EL MÉTODO DE TURKEVICH.

Author

Calixto-Rodriguez, M., Sarmiento-Bustos, E., Reyes-Mayer, Adriana, González-Castañeda, M., N. Hernández-Corona, Mónica, D. Martínez-García, Kevin, and A. Ayala-Eloisa, René

Abstract

Copyright of Congreso Internacional de Investigacion Academia Journals is the property of PDHTech, LLC and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2018

15. PDMS Nanodomains in DGEBA Epoxy Induce High Flexibility and Toughness.

Author

Romo-Uribe, Angel, Arcos-Casarrubias, Jose Antonio, Reyes-Mayer, Adriana, and Guardian-Tapia, René

Subjects
POLYDIMETHYLSILOXANE, EPOXY resins, NANOCOMPOSITE materials, TRANSMISSION electron microscopy, CURING, DYNAMIC mechanical analysis, MATERIAL plasticity
Abstract

A nanostructured, highly flexible, and optically transparent epoxy nanocomposite has been formulated reacting diglycidyl ether of bisphenol-A with amine-functionalized silyl-diglycidyl ether-terminated poly(dimethylsiloxane). The concentration of poly(dimethylsiloxane) varied up to 10 wt% and curing was performed at 90°C. Transmission electron microscopy revealed poly(dimethylsiloxane) droplets up to 180 nm in diameter well dispersed in the epoxy. Dynamic mechanical analysis exhibited a decrease in elastic modulusE′ and glass transition temperatureTg, and an increase in theαrelaxation strength suggesting increased local molecular motions. Strikingly, poly(dimethylsiloxane) induced a threefold increase in strain at fracture and toughness. Furthermore, hydrophobic behavior was induced by poly(dimethylsiloxane) as the water contact angle increased from 72° (neat epoxy) up to 110° at 5 wt% poly(dimethylsiloxane) content. Fractured surfaces exhibited plastic deformation, contrary to brittleness in the neat epoxy. These nanocomposites are attractive for coatings/encapsulates with improved flexibility, toughness, optical transparency, and water resistance. [ABSTRACT FROM PUBLISHER]

Published
2017
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18. Thermomechanical behavior, light and X-ray scattering of polylactic acid

Author

Romo-Uribe, Angel and Reyes-Mayer, Adriana

Abstract

This research focuses on the thermal properties, microstructure and mechanical behavior of extruded films of biodegradable polylactic acid (PLA) and compares these properties with those from polyethylene, high density and linear low density. Thermal properties showed poorer thermal stability of PLA (some 100°C lower than the polyolefins), and poorer ability for PLA to crystallize, exhibiting a pronounced cold crystallization exothermic peak, not present in the extruded polyolefins. Poor crystallization in PLA films was corroborated by wide-angle and small-angle X-ray scattering, and hot-stage optical microscopy. Uniaxial deformation showed that the mechanical properties of PLA film along and orthogonal to the extrusion direction (determined under uniaxial testing at room temperature) are significantly larger than the polyolefins, by a factor of 2–6. Moreover, the mechanical properties along and orthogonal to the extrusion direction revealed significant anisotropic mechanical properties of PLA. Furthermore, the mechanical modulus of PLA was a decreasing function of strain rate thus suggesting a strain rate softening behavior.

Published
2014
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