The changes in the properties of new crosslinked polymers based on renewable resources and their derived composites have been monitored as a function of time; this knowledge being necessary to estimate their behavior in final applications. Rigid thermoset polymers prepared by free radical polymerization of resins obtained from linseed oil and styrene and composites reinforced with wood flour were evaluated in different environmental conditions and at different times after their preparation. The action of atmospheric oxygen on the unsaturated groups in fatty acids produces chemical changes in these polymers, which affect the properties of the cured materials. These changes were analyzed using Fourier transform infrared spectroscopy, dynamic mechanical analysis and mechanical testing. An increase in the modulus with time was observed during exposure of the samples to dry conditions, or humid environments (60% relative humidity), with or without UV irradiation. The reaction with oxygen appears to be accelerated when the materials are subjected to UV irradiation, showing a large effect on the glass transition temperature.
En este trabajo se analiza la relación entre la experiencia educativa y la persona innovadora, se estudia la influencia de dicha experiencia en el desarrollo de las capacidades y las habilidades para la innovación en las personas entrevistadas. La discusión que se lleva a cabo se fundamenta en una aproximación de tipo cualitativo, mediante la realización de diez entrevistas a personas definidas como innovadoras, localizadas en las empresas de la industria alimentaria de Costa Rica. Se analizan las experiencias de las personas innovadoras respecto a los diferentes tipos de educación y cómo estas permiten generar competencias para la innovación, es decir, permiten o no educar para innovar. Entre los principales hallazgos, se destaca la identificación, en diversos niveles, de la influencia del proceso educativo formal, no formal e informal, en el desarrollo de las personas innovadoras. Influencia no siempre positiva, pues puede aparecer como una condición que propicia el desarrollo de las capacidades de innovación o como limitante, según lo muestran las experiencias de las personas innovadoras estudiadas
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