Suppression of beta relaxation in vapor deposited glass of poly (methyl methacrylate)

Dielectric relaxation is used to probe the beta relaxation in vapor deposited films of poly (Methyl methacrylate). The dielectric storage and loss at 1 kHz are measured during heating and cooling for as prepared vapor deposited glasses and for glasses that have been annealed or rejuvenated to a supercooled liquid and back into a glass. Suppression of the beta relaxation is observed in the vapor deposited glasses. We discuss our results by comparing the dielectric loss and capacitance measurements for different deposition temperatures and their resulting stabilities in PMMA.