Synthesis and interfacial properties of organosilane derivative of acrylated soybean oil

Abstract

In this study silanized Acrylated Epoxidized Soybean Oil (AESO), a multifunctional monomer was synthesized by reacting Acrylated Epoxidized Soybean Oil with 3-Aminopropyltriethoxysilane via Michael Addition Reaction. The characterization of silanized-AESO was done by NMR spectroscopy. Homopolymer of silanized-AESO was synthesized by using benzoyl peroxide as radical initiator. The silanized-AESO homopolymer was characterized by IR spectroscopy. Improvements in the adhesion upon moisture cure and the effect of prolonged exposure to moisture on interfacial bonding on glass surface of silanized-AESO homopolymer were analyzed according to standard ASTM D 4541 Pull-Off Adhesion Test. After moisture curing process, an approximate of eight fold improvement was observed in the adhesion strength. Prolonged exposure to humidity for 48 hours caused to approximately 15 per cent decrease in the adhesion strength. Silanized-AESO was copolymerized with styrene in 1:1 weight ratio via radical polymerization. 2,2’-azobis(isobutyronitrile) (AIBN) was used as radical initiator. The effect of increased crosslink density upon moisture cure on the mechanical properties of silanized AESO styrene copolymer was analyzed by DMA (Dynamic Mechanical Analysis), DSC (Differential Scanning Calorimetry),TGA (Thermal Gravimetric Analysis), swelling, and surface hardness tests. Upon moisture cure 35 per cent improvement was observed in the storage modulus due to the increase in the crosslink density. According to tan curves and surface hardness tests, silanized-AESO-styrene copolymer shows heterogeneous morphology in crosslinked areas.