| Abstract: | The effect of transreactions on the phase behavior in poly(ethylene 2,6-naphthalate) and poly(ethylene isophthalate) blends was investigated by using differential scanning calorimetry. The transreactions between two polymers were confirmed by 1H nuclear magnetic resonance. At the beginning step of transreactions, the blend samples show two glass transitions. However, after transreactions occur to some extent (i.e., when the degree of randomness is >0.4), a single glass transition is observed. As the transreactions proceed, the composition difference between ethylene 2,6-naphthalate-rich and ethylene isophthalate-rich phases lessens. Additionally, the weight fraction of each phase decreases because of the increment of interfacial fraction with the lapse of reaction time. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1851–1858, 1999 |
