Yk. Chang et al., The effect of transreactions on phase behavior in poly(ethylene 2,6-naphthalate) and poly(ethylene isophthalate) blends, J APPL POLY, 73(10), 1999, pp. 1851-1858
The effect of transreactions on the phase behavior in poly(ethylene 2,6-nap
hthalate) and poly(ethylene isophthalate) blends was investigated by using
differential scanning calorimetry. The transreactions between two polymers
were confirmed by H-1 nuclear magnetic resonance. At the beginning step of
transreactions, the blend samples show two glass transitions. However, afte
r transreactions occur to some extent (i.e., when the degree of randomness
is >0.4), a single glass transition is observed. As the transreactions proc
eed, the composition difference between ethylene 2,6-naphthalate-rich and e
thylene isophthalate-rich phases lessens. Additionally, the weight fraction
of each phase decreases because of the increment of interfacial fraction w
ith the lapse of reaction time. (C) 1999 John Wiley & Sons, Inc.