May 11, 2010

Midwest Biopolymers & Biocomposites Workshop

 

Poster Abstracts

103: Effect of silane coupling agent on interfacial properties of glass fiber reinforced biorenewable resin

Hongyu Cui and Michael R. Kessler

Department of Materials Science and Engineering
Iowa State University, Ames, Iowa


To increase the interfacial shear strength between glass fibers and a vegetable oil-based biorenewable resin, a unique norbornyl functionalized silane coupling agent is used to modify the glass surface. X-ray photoelectron spectroscopy (XPS) confirmed that the norbornyl silane was effectively grafted onto the glass surface. Composite panels, made with silane-treated glass fabric and non-treated fabric, were manufactured, and their thermomechanical properties were analyzed using dynamic mechanical analysis (DMA) and short beam shear tests. The interfacial shear strength determined by short beam tests showed significant improvement when the glass fiber was appropriately functionalized. The DMA experiments also demonstrated that there is a significant increase in the storage modulus of the silane-treated composites compared to the composites with the unmodified glass fiber, indicating better interfacial stress transfer between the fiber reinforcement and the biorenewable polymer matrix in the composite with the silane-treated fiber.