Maria del Pilar Rodriguez Rojas

Dr. Maria del Pilar Rodriguez Rojas


Research Focus & Metrics

Academic Career Length

17Years (2010-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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12 January 2026 in Polymers
Verified
Journal Article
Open access
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AVArturo Valenzo
Arturo Valenzo
MRMaria del Pilar Rodriguez Rojas
Maria del Pilar Rodriguez Rojas
HMHoracio Martínez-Valencia
Horacio Martínez-Valencia
Victoria Bustos-TerronesVictoria Bustos-Terrones
Victoria Bustos-Terrones
ÁTÁlvaro Torres
Álvaro Torres
AMArturo Molina
Arturo Molina
Polyhydroxybutyrate (PHB) is considered a coating material capable of limiting the corrosion of biodegradable metallic implants due to its biocompatibility and ability to form a physical barrier. In this study, PHB was deposited on commercial AZ91D magnesium alloy using the spin coating technique. To improve adhesion at the polymer–substrate interface, the magnesium substrates were subjected to atmospheric pressure plasma treatment for different exposure times (5, 10, or 15 min) before coating. The optimal treatment time of 5 min significantly increased substrate wettability and surface free energy, facilitating stronger PHB adhesion. In addition, the PHB coatings were subjected to atmospheric pressure plasma treatment for 5, 10, or 15 s to evaluate potential surface modifications. Corrosion behavior under simulated physiological conditions was assessed via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in HANK’s solution at 37 °C. Pull-off tests were used to evaluate the adhesion strength between the coating and the substrate under each treatment condition. The results showed a significant decrease in the corrosion rate (Vcorr), from 4.083 mm/year for bare Mg-AZ91D to 0.001 mm/year when both the substrate and the polymer received plasma treatment. This indicates that the treatment modifies surfaces and improves interfacial bonding, enhancing polymer–metal interaction and producing durable, biocompatible coatings for medical implants.

1 December 2010 in Mediações - Revista de Ciências Sociais
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Journal Article
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MRMaria del Pilar Rodriguez Rojas
Maria del Pilar Rodriguez Rojas
RRRicardo Horacio Rubio
Ricardo Horacio Rubio
Fortes críticas foram formuladas desde a tradição marxista tanto ao desconstrucionismo derridiano quanto às posições pós-modernistas por considerá-las preocupadas apenas com questões relacionadas às diferenças, esquecendo aquelas relacionadas às desigualdades socioeconômicas. No entanto, muito do feminismo crítico se baseou em tais teorias para apoiar seus argumentos. Tanto a relevância dessas críticas quanto a incidência particular do desconstrucionismo e do pós-modernismo na teoria e na práxis feministas são analisadas à luz de dois debates atuais. A primeira, em torno do potencial político das posições desconstrucionistas e pós-modernistas e a segunda, referia-se à suposta antinomia entre redistribuição socioeconômica e reconhecimento cultural das diferenças. A abordagem proposta permite recolocar a análise em um horizonte de compreensão muito mais amplo e abrangente.