Copolymers from different feed compositions of glycidyl methacrylate (GMA) and tetrahydrofurfuryl acrylate (THFA) were synthesized using free radical polymerization in toluene solution at 70±1°C using benzoyl peroxide (BPO) as initiator. The polymers were characterized by 1 H NMR,13C NMR and DEPT spectroscopic techniques. The copolymer compositions were determined using 1H NMR analysis. Reactivity ratios for GMA and THFA were determined by the Kelen-Tudos, TidwellMortimer and error-in-variables model methods. The results showed that all these copolymerizations were strictly linear systems describable by the Mayo-Lewis equation based on the terminal model and that accurate reactivity ratio data can be obtained.
The mismatch in coefficient of thermal expansion (CTE) between the veneered
porcelain and the ceramic core has been primarily identified as the cause of core/veneer chipping
in all-ceramic restorations. This study aimed to evaluate the effect of sodalite infiltration on the
CTE behaviour and bond strength of different all-ceramic prostheses. Materials and Methods: The
experimental groups were synthesised sodalite-infiltrated alumina (IA-SOD) and synthesised
sodalite-infiltrated zirconia-toughened alumina (ZTA) (IZ-SOD), while the control groups were glassinfiltrated alumina (IA-glass) and glass-infiltrated ZTA (IZ-glass). (Copied from article).