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- W2034492474 abstract "Poly(p-acryloyloxybenzoic acid) has been obtained in twelve single and two-phase physical states, which include the amorphous glassy and liquid states, the mesomorphic glassy and the mesomorphic liquid states and in addition eight two-phase semicrystalline states (crystal forms I and II). Using mainly differential scanning calorimetry, the transition temperatures, energies and heat capacity changes at the glass transitions have been studied. The time dependency of the glass transition has also been determined. The strongly heating rate dependent amorphous glass transition occurs at 348K (20k min−1 heating rate, ΔCp = 39 JK−1 mol−1), the mesophase glass transition, at 408K (also at 20k min−1, ΔCp = 43 JK−1 mol−1). The latter is less heating rate dependent. The amorphous to mesophase transition occurs between 375 and 475K (ΔH = −4.5 KJ mol−1); the peaks of melting transitions, which are also strongly heating rate dependent, were observed at 573K and 553K (20 K min−1 heating rate) for crystal forms I and II, respectively. The heat of fusion of crystal form I is estimated to be 22 KJ mol−1. There seems to be no partially amorphous-partially mesomorphic state." @default.
- W2034492474 created "2016-06-24" @default.
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- W2034492474 date "1981-06-01" @default.
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- W2034492474 title "Phase transitions in mesophase macromolecules: The transitions of poly(p-acryloyloxybenzoic acid)" @default.
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- W2034492474 doi "https://doi.org/10.1016/0032-3861(81)90014-8" @default.
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