Synthesis,structure, and thermal property of poly(trimethylene terephthalate-<Emphasis Type="Italic">co</Emphasis>-trimethylene 2,6-naphthalate) copolymers |
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| Authors: | Young?Gyu?Jeong Email author" target="_blank">Won?Ho?JoEmail author Sang?Cheol?Lee |
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| Institution: | (1) Hyperstructured Organic Materials Research Center and School of Materials Science and Engineering, Seoul National University, 151-742 Seoul, Korea;(2) School of Advanced Materials and Systems Engineering, Kumoh National University of Technology, 730-701 Kumi, Korea |
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| Abstract: | Poly(trimethylene terephthalate-co-trimethylene 2,6-naphthalate)s (P(TT-co-TN)s) with various copolymer composition were synthesized,
and their chain structure, thermal property and crystalline structure were investigated by using1H-NMR spectroscopy, differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD), respectively. It was
found from sequence analysis that all the P(TT-co-TN) copolymers synthesized have a statistical random distribution of TT
and TN units. It was also observed from DSC thermograms that the glass transition temperature increases linearly with increasing
the TN comonomer content, whereas the melting temperature of copolymer decreases with increasing the corresponding comonomer
content in respective PTT- and PTN-based copolymer, showing pseudo-eutectic melting behavior. All the samples melt-crystallized
isothermally except for P(TT-co-66 mol % TN) exhibit multiple melting endotherms and clear X-ray diffraction patterns. The
multiple melting behavior originates from the dual lamellar population and/or the melting-recrystallization-remelting. The
X-ray diffraction patterns are largely divided into two classes depending on the copolymer composition, i.e., PTT and PTNβ-form diffraction patterns, without exhibiting cocrystallization. |
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| Keywords: | Poly(trimethylene terephthalate) Poly(trimethylene naphthalate) Copolymer Thermal property Crystal structure |
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