As shown by the data on the relaxation transitions in PMMA obtained in a wi
de temperature range from -200 to +450 degreesC by the methods of dynamic s
pectroscopy (internal friction spectra) and nondynamic mechanical spectrosc
opy (thermostimulated creep spectra and creep rate spectra), multiplicity o
f relaxation transitions as observed in the internal friction spectra is al
so typical of the data of nondynamic mechanical spectroscopy. In this case,
relaxation transition temperatures and maxima in thermostimulated creep sp
ectra and creep rate spectra coincide with the transition temperatures and
maxima in the internal friction spectra at frequencies equivalent to the ti
me regimes applied in the nondynamic testing of polymers. The molecular nat
ure of relaxation transitions in PMMA as established by the methods of dyna
mic mechanical spectroscopy allows one to unequivocally identify the nature
of maxima and transition temperatures in the spectra of nondynamic mechani
cal spectroscopy.