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- W2502647060 abstract "Proton and 13C NMR have been utilized to characterize the motional processes occurring in the homopolymer of 4-hydroxybenzoic acid, PHBA, over the temperature range 27-400°C. Changes in the line shape of the ring protons and of the chemical shielding anisotropy pattern of the carboxyl carbon provide a picture of motion in PHBA in which: 1) phenyl ring motion in the polymer occurs about the C1 - C4 axis well-below the 350°C phase transition and thus is not tied to the transition; 2) the onset of motion for some of the rings occurs at ca. 120°C while all the rings show motion (180° ring flipping) by 300°C; 3) the motion of the ester group only ensues with the phase transition and involves occurrence of a second motion about the chain axis, again involving jumps by ca. 180° but with the entire repeat unit participating in the motion." @default.
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- W2502647060 date "1990-08-24" @default.
- W2502647060 modified "2023-09-25" @default.
- W2502647060 title "Molecular Motion in the Homopolyester of 4-Hydroxybenzoic Acid" @default.
- W2502647060 doi "https://doi.org/10.1021/bk-1990-0435.ch025" @default.
- W2502647060 hasPublicationYear "1990" @default.
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