Miscibility of poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate) blends by transesterification

✍ Scribed by Dae Woo Ihm; Soo Young Park; Cheol Gyu Chang; Yoon Sung Kim; Hwan Kwang Lee

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 579 KB
• Volume: 34
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199610)34:14<2841::aid-pola1>3.0.co;2-u

✦ Synopsis

The effects of transesterification on the miscibility of poly(ethy1ene terephthalate)/ poly(ethy1ene 2,6-naphthalate) were studied. Blends were obtained by solution precipitation a t room temperature to avoid transesterification during blend preparation. The physical blends and transesterified products were analyzed by wide-angle x-ray scattering, differential scanning calorimetry, and nuclear magnetic resonance spectroscopy. It was found that the physical blends are immiscible and when the extent of transesterification reaches 50% of the completely randomized state, independent of blend composition, the blends are not crystallizable and show a single glass transition temperature between those of starting polymers. The interchange reactions were significantly influenced by annealing temperature and time but negligibly by blend composition. 0 1996 John Wiley & Sons, Inc.