FRANCISCO ROLANDO VALENZUELA DIAZ
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Artigo IPEN-doc 23881 Comparison between HDPE/clay and HDPE/piassava fiber/clay treated by electron beam radiation2013 - ORTIZ, ANGEL; ESCANHOELA, CORDELIA M.F.; GOMES, MICHELLE; OLIVEIRA, RENE R.; DIAZ, FRANCISCO R.V.; MOURA, ESPERIDIANA A.B.This work evaluates changes in morphological, mechanical and thermo-mechanical properties of electron-beam irradiated HDPE/nanoclay and HDPE/Piassava fiber/nanoclay. Material samples irradiated with 100 and 200 kGy using a 1.5 MeV electron beam accelerator (room temperature, presence of air) were submitted to tensile, flexural, and HDT tests. MFI, SEM and XRD analyses were carried out. Correlation between properties was discussed. Results showed that incorporation of piassava (Attalea funifera Mart) fiber and nanoclay, followed by irradiation represented significant gain in thermo-mechanical properties. Changes in surface morphology and reduction in MFI were observed. In conclusion, it may be claimed that the incorporation of piassava fiber in small size particles and nanoclay in the HDPE followed by electron-beam irradiation effectively improved the polymer properties and led to materials with superior properties suitable for several industrial applications.Artigo IPEN-doc 20807 Comparison between bio-composite based green HDPE/Brasil nut shell fiber (BNSF) treated and non treated by electron-beam radiation2014 - CAMPOS, REJANE D.; HOSUR, MAHESH; JEELANI, SHAIK; DIAZ, FRANCISCO R.V.; MOURA, ESPERIDIANA A.B.; SEO, EMILIA S.M.The composite is an alternative favorable for different industries because they combine the best mechanical properties with the best physic-chemistry properties of two or more materials. Environmental issues are forcing industry to seek alternative, more eco-friendly materials; using natural fibers with polymers based on renewable resources will allow many environmental issues to be solved. In this sense, researches with focus on vegetal fibers as reinforcement in composites is growing and positive results in performance have been achieved. This paper describes the preparation and characterization of bio-composite that was developed from Brazil Nut Shell Fiber (BNSF) and green high-density polyethylene (HDPE G). The composite prepared was irradiated with 100 and 200 kGy using a 1.5 MeV electron beam accelerator, at room temperature, in presence of air. The samples were characterized to understand the nature of interaction between BNSF reinforcement and HDPE matrix and their properties were discussed.