Abstract
In this work, polyvinyl butyral (PVB) nanocomposites reinforced with 0.5 to 2.5 wt% of graphene oxide (GO) were synthesized via „in situ‟ polymerization. PVB was obtained by condensation of hydroxyl groups of polyvinyl alcohol (PVA) with butyraldehyde (BU) Thermogravimetric analyzes (TGA) showed the increase in the thermal conductivity of the nanocomposites compared to PVB. FTIR results showed the conversion of PVA to PVB, but no changes in the spectrum were observed for nanocomposites. Nuclear magnetic resonance spectroscopy (1H NMR) shows a change in the degree of acetalization of PVB with the presence of the nanoparticles. When the increase in the concentration of GO, a decrease in the degree of acetalization of PVB is observed. The differential scanning calorimetry (DSC), show a decrease in Tg values, probably caused by the change of degree of acetalization. The results of the Raman spectroscopy analysis show upshift in the G band up to 20 cm-1, associated with the presence of van der Walls interaction between the GO and PVB and the mechanical compression phenomena of the GO nanoparticles are compressed in the „bulk‟ of polymer. Thus, it was observed that the „in situ‟ polymerization process contributed to the formation of a colloid between GO and water used as solvent in the synthesis. The formation of this colloid helped to improve the interfacial interaction between GO and PVB. However, the presence of GO also contributed to change the degree of acetalization of PVB, as it decreased the condensation of some hydroxyl groups of the precursor PVA degree of acetalization. Keywords: polyvinyl butyral, graphene oxide, nanocomposites.
Highlights
Polyvinyl butyral (PVB) it is an important resin product that is commonly employed as the adhesive layer of laminated glass in vehicles and house windows
polyvinyl butyral (PVB) was obtained by condensation of hydroxyl groups of polyvinyl alcohol (PVA) with butyraldehyde (BU) Thermogravimetric analyzes (TGA) showed the increase in the thermal conductivity of the nanocomposites compared to PVB
Since graphene oxide (GO) has a large amount of hydroxyls covalently attached to its structure, they may have influenced in the condensation of PVA with BU, causing BU prefer to react with the hydroxyls of GO than PVA
Summary
Polyvinyl butyral (PVB) it is an important resin product that is commonly employed as the adhesive layer of laminated glass in vehicles and house windows. Their transparency combined with mechanical strength, flexibility and adhesiveness to metals our glass and resistance to weathering (rain, humidity, heat) [1,2]. PVB is a random copolymer of vinyl alcohol, vinyl acetate and vinyl butyral obtained by the condensation reaction of polyvinylalcohol (PVA) with butyraldehyde (BU) in acid medium. The final balance of hydroxyl groups and acetals rings will depend on the reaction conditions of the synthesis, and the relationship between these groups can produce a copolymer with varying properties in mechanical strength, permeability and thermal characteristics [3].
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