The chemical structures of most of the compounds used in this study are detailed. The original synthesis of the a-Terp epoxy monomer (based on a-terpineol) has been published elsewhere. The a-Terp epoxy monomer used in this study was donated by Loctite Corporation and was used as received. Hexahydro-4-methylphthalic anhydride (HHMPA), ethylene glycol (EG), N,N-dimethylbenzylamine (BDMA), sodium bromide, and methanol were used as received from Aldrich. ERL-4221e (ERL), a cycloaliphatic diepoxide monomer originally made by Union Carbide, was donated by IBM Corporation and used as received.