Preparation and capability of polymer type silane coupling agents for GFRP
Sugiyama Kazuo; Uemura Takato; Shimohara Ichiro; Yoshimitsu Yoshikuni
Abstract:By considering the compatibilizing effect for polymer alloy, two kinds of polymer type silane coupling agents, poly (methyl methacrylate) type (MacTMS-Ia - e) with Mn =1000 - 9800 and poly (styrene) type (MacTMS-IIa - e) with Mn =8300- 11700 were prepared from the reaction of corresponding omega -allyl macromonomers and trimethoxysilane using H2PtCl6 as a catalyst, where omega -allyl macromonomers with a different molecular weight were prepared by radical polymerization of methyl methacrylate (or styrene) initiated with 2.2' -azobisisobutyronitrile, varying the concentration of allyl mercaptan as a chain transfer agent. From the reaction of MacTMS and glass beads, the grafting efficiency (GE) of polymer onto glass beads was found to be 6.14approx.15.45%. A series of glass fiber reinforced plastics (GFRP-Ia - e, GFRP-IIa - e) were fabricated from GF cloth modified with MacTMS and bisphenolic epoxy acrylate resin oligomer as a matrix resin. It was found that the mechanical properties, such as flexural strength, flexural modulus, and ILSS, were affected by both the degree of polymerization and grafting efficiency of MacTMS. Key Words:polymer type coupling agent, compatibilizing effect, omega-Allyl macromonomers, grafting efficiency, flexural strength, flexural modulus, ILSS, GFRP