Porous Ceramics by Photopolymerization with Terpene-Acrylate Vehicles

摘要

A novel terpene-acrylate photopolymerizable vehicle was used to fabricate porous polymer-ceramic composites and sintered porous ceramics. The vehicle consists of camphene, camphor and a diacrylate monomer. Alumina or silica suspensions were mixed above the melting point of the terpene. Upon cooling, the terpene crystallized from the solution as particle-free den-drites, with the powder and liquid monomer in the interdendrit-ic spaces. The monomer could subsequently be solidified by photopolymerization. The rheological behavior is reported for ceramic suspensions in the molten terpene-monomer solution. The photopolymerization cure depth versus energy dose is reported for silica and alumina systems. The microstructure of the porous solid is characterized for systems with camphor/ camphene and menthol as terpene. The structure of the dendritic porosity is compared as a function of powder volume fraction, for particles smaller or larger than the dendrite arm spacing.