Dw. Ihm et al., MISCIBILITY OF POLY(ETHYLENE TEREPHTHALATE) POLY(ETHYLENE 2,6-NAPHTHALATE) BLENDS BY TRANSESTERIFICATION/, Journal of polymer science. Part A, Polymer chemistry, 34(14), 1996, pp. 2841-2850
The effects of transesterification on the miscibility of poly(ethylene
terephthalate)/poly(ethylene 2,6-naphthalate) were studied. Blends we
re obtained by solution precipitation at room temperature to avoid tra
nsesterification during blend preparation. The physical blends and tra
nsesterified products were analyzed by wide-angle x-ray scattering, di
fferential scanning calorimetry, and nuclear magnetic resonance spectr
oscopy. It was found that the physical blends are immiscible and when
the extent of transesterification reaches 50% of the completely random
ized state, independent of blend composition, the blends are not cryst
allizable and show a single glass transition temperature between those
of starting polymers. The interchange reactions were significantly in
fluenced by annealing temperature and time but negligibly by blend com
position. (C) 1996 John Wiley & Sons, Inc.