The temperature dependence of the alpha and beta relaxations of poly(2-phenyl-5-acryloxymethyl-5-ethyl-1,3-dioxacyclohexane) is studied by broad-band dielectric spectroscopy. The strength of the alpha-relaxation decreases with increasing temperature, pointing to an onset temperature (Deltais an element of(alpha), = 0) of ca. 97 degreesC. Seen from the high-temperature side, the a relaxation starts with zero intensity at the onset temperature and steeply increases with decreasing temperature until it levels off in the vicinity of T-g. Whereas in the glassy state the strength of the beta relaxation is only slightly dependent on temperature, it undergoes a strong increase at temperatures above T-g. Arrhenius plots of both relaxations show that the beta process remains operative at temperatures above the onset temperature of the cc relaxation. The temperature dependence of the stretch exponent does not show a definite trend, most of the values obtained lying in the interval 0.3-0.5.