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- W2906252015 endingPage "587" @default.
- W2906252015 startingPage "579" @default.
- W2906252015 abstract "ABSTRACT High T g amorphous copolyester thermoplastics were synthesized by incorporating 4,4′‐bibenzoate (4,4′BB) and 3,4′‐bibenzoate moieties into the polyester backbone via melt polycondensation. The high levels of crystallinity typically associated with 4,4′BB containing polyesters were suppressed through copolymerization of ethylene glycol, 1,4‐cyclohexane dimethanol, and neopentyl glycol (NPG) diols. NPG was shown to be highly effective in suppressing crystallization and was used to produce amorphous compositions with T g ’s as high as 129 °C. Diol ratios were determined by 1 H NMR spectroscopy and molecular weights were assessed with inherent viscosity ( η inh ). Thermogravimetric analysis showed single‐step weight losses in the range of 395 – 419 °C. Differential scanning calorimetry was used to determine melting points and glass transition temperatures over a wide range of copolyester compositions and identified amorphous compositions. Dynamic mechanical analysis confirmed T g ’s and was used to study β ‐relaxations below the T g . Rheological analysis revealed the effect of NPG structures on shear thinning and thermal stability. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019 , 57 , 579–587" @default.
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- W2906252015 date "2018-12-23" @default.
- W2906252015 modified "2023-10-13" @default.
- W2906252015 title "Amorphous copolyesters based on bibenzoic acids and neopentyl glycol" @default.
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- W2906252015 doi "https://doi.org/10.1002/pola.29296" @default.
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