Abstract
Poly(trimethylene 2,6-naphthalate) (PTN) is one of the 1,3-propanediol (PDO)-based aromatic polyesters which has potential applications for special barrier films and packaging due to its excellent oxygen and carbon dioxide gas barrier property. In this work, we investigated the chain conformation and phase transition behavior of poly(trimethylene 2,6-naphthalene) (PTN) α-form crystal with synchrotron wide- and small-angle X-ray scattering (WAXS and SAXS), attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, and differential scanning calorimetry (DSC) methods. ATR-FTIR results showed that the infrared bands at 1327 and 987 cm–1 were sensitive to PTN α-form crystalline phase and were assigned to trans conformers of trimethylene group, whereas the infrared bands at 1357 and 1372 cm–1 were sensitive to PTN β-form crystalline phase and were assigned to gauche conformers of the trimethylene group. The results showed that the conformation of trimethylene glycol residue in PTN α-form cr...
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