Communication: The mechanical properties and orientation behavior of atacti
c poly(methyl methacrylate) films cast from acetone (A-aPMMA films) and chl
oroform (C-aPMMA films), with subsequent sub-T-g annealing, have been studi
ed. The formation of stereocomplex in sub-T-g-annealed A-aPMMA films and C-
aPMMA films was demonstrated by means of differential scanning calorimetry.
Stereocomplex in A-aPMMA films is more pronounced than in C-aPMMA films at
each annealing temperature. It is proposed that stereocomplex formation ca
n process at temperature below T-g, leading to enhanced yield stress and hi