Efeito do tipo de silano e do tratamento térmico nas propriedades do compósito experimental reforçado por fibra de vidro

Abstract

The aim of this study was to evaluate the fiber reinforcement composite properties varying the silane type and thermal treatment in glass fiber. Two study factors were evaluated: silane type in three levels: 3-acryloyloxypropyltrimethoxysilane (ACPS), 3- methacryloyloxypropyltrhimethoxysilane : containing isopropylamine and hexane for solvent to alkaline hydrolysis (MPSiso) and 3- methacryloyloxypropyltrhimethoxysilane with acid acetic for acid hydrolysis( MPSeth) and the submission or not of silanized fibers in thermal treatment in two levels: 120º C (HT) and room temperature (RT). Experimental composite specimens were divided in sex groups: ACPS-HT; ACPS-RT, MPSiso-HT, MPSiso-RT, MPSeth-HT e MPSeth-RT. Experimental composite specimens were composed of 30wt% of 3 mm-short glass fiber, 22.5wt% of methacrylate-based resin and 47.5wt% of filler particles were manipulated. Three types of silane were used: ACPS, MPSiso: containing isopropylamine and hexane for solvent to aid in the alkaline hydrolysis and MPSeth: with acid acetic for acid hydrolysis. In addition, two thermal treatment: high temperature with 120ºC (HT) and room temperature (RT)Six experimental groups were prepared for flexural strength (n=10), diametral tensile strength (n=10), degree of conversion (n=5) and for sorption and solubility (n=5). Scanning electron microscopy (SEM) was used to evaluate the microstructure of composite. The Statistical analysis of the data was performed with ANOVA (Two-way and Three- way) and the Tukey’s post-hoc. Statistical analysis showed the highest diametral tensile strength was for ACPS and HT (p<0.05). The flexural strength the MPSeht present lower values than other systems (p<0.05) and the HT not present statistical difference with RT (p> 0.05). FTIR showed the ACPS silane systems present high values than others systems and HT present statistical difference with RT (p<0.05). The sorption and solubility present no difference statistical between the silane systems (p>0.05) and RT showed more satisfactory values than HT (p<0.05). The SEM images no present difference between the groups. Thus, it is concluded the ACPS with thermal treatment showed better results at properties evaluated on composite resin reinforced with glass fiber.