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• W2051288966 abstract "Abstract Both thermoplastic polyesters, poly(butylene-terephthalate) (PBT) and poly(butylene-2,6-naphthalate) (PBN), have been observed to undergo solid–solid phase transitions between α and β crystalline polymorphs. Fiber repeat distances determined by X-ray diffraction in the β polymorphs of PBT and PBN are larger than those observed in their α polymorphs. This has generally been attributed to an extension of the butylene glycol portion of both polyesters, where the O–CH 2 –↷ ϕ –CH 2 –CH 2 and (CO)–O–↷ ψ –CH 2 –CH 2 bonds are transformed from ϕ = G to S and ψ = G to T or S to T conformations, respectively, when PBT or PBN transform from their α to their β polymorphs. However, this interpretation is not consistent with solid-state 13 C NMR observations made on the α and β crystalline forms of PBT and PBN. In both instances, only very small differences (0.4–0.8 ppm) in the resonance frequencies of the butylene carbon resonances are observed between the 13 C NMR spectra recorded for both polymorphs. Similar small differences in the aromatic carbon resonance frequencies are observed between their α and β polymorphs. Thus, we conclude that the extension of both PBT and PBN chains, as they are transformed from their α to their β crystalline polymorphs, is more likely a consequence of an increase in the coplanarity of their ester groups and their phenyl or naphthyl rings, rather than conformational extensions of their butylene glycol fragments. A search for PBT and PBN conformations, both of which match the fiber repeat distances observed for their α and β crystalline polymorphs and are consistent with the closely similar 13 C chemical shifts observed in both of their crystalline phases, lends further support to this suggestion." @default.
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• W2051288966 date "2002-01-01" @default.
• W2051288966 modified "2023-10-14" @default.
• W2051288966 title "The conformations of poly(butylene-terephthalate) and poly(butylene-2,6-naphthalate) chains in their α and β crystalline polymorphs" @default.
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• W2051288966 doi "https://doi.org/10.1016/s0032-3861(02)00506-2" @default.
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