In this study, a series of blends of poly(methyl methacrylate) (PMMA) and poly(styrene-co-acrylonitrile) (SAN) were prepared, aged and their enthalpy relaxation evaluated. The overall objective was to monitor and analyze physical aging and enthalpy, volume and stress relaxation measurements. The following general findings were observed; 1. the higher the aging temperature, the faster the relaxation process; 2. under similar aging conditions, SAN-rich blends relax more slowly than PMMA-rich blends at Tg-20°C and Tg-35°C; 3. relaxation rate is insensitive to composition at Tg-50°C; 4. the effect of blending on relaxation is related to the aging temperature in a complex manner; and 5. the maximum possible error in the normalized deviation in enthalpy is ±4%, with the actual error being much smaller.
|Original language||English (US)|
|Number of pages||3|
|Journal||Annual Technical Conference - Society of Plastics Engineers|
|State||Published - 1989|
|Event||ANTEC 89 - 47th Annual Technical Conference of SPE - New York, NY, USA|
Duration: May 1 1989 → May 4 1989
ASJC Scopus subject areas