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• W1996131271 endingPage "2104" @default.
• W1996131271 startingPage "2095" @default.
• W1996131271 abstract "Polarized laser Raman microscopy was used to estimate the molecular orientation of uniaxially drawn films of mostly random copolymers of poly(ethylene 2,6-naphthalate) (PEN) and poly(ethylene terephthalate) (PET) as a function of the draw ratio. The Raman bands of the symmetric stretching modes of benzene and naphthalene rings at 1616 and 1636 cm-1 have been respectively used for PET and PEN segments orientation evaluation. Polarized Raman spectra obtained from PEN/PET films in the whole concentration range indicate that PET segments are better oriented in the copolymers than in the homopolymer attenuating the neck formation of PEN. Moreover, PEN/PET films stretched at temperatures 30 °C higher than the corresponding glass transition temperatures exhibit different degrees of segmental relaxation depending on the dominant, PEN or PET, number-average segment length. These relaxation discrepancies are accompanied by conformational changes of the ethylene moieties. In certain PEN/PET polymer mixtures, at specific window of stretching parameters, PEN segments exhibit comparable and even higher homopolymer molecular orientation. Isotropic and drawn type films were both characterized by DSC, solution 1H NMR, dynamic mechanical tensile measurements, and FT-Raman spectroscopy." @default.
• W1996131271 created "2016-06-24" @default.
• W1996131271 creator A5023731579 @default.
• W1996131271 creator A5045285145 @default.
• W1996131271 date "2002-02-05" @default.
• W1996131271 modified "2023-10-10" @default.
• W1996131271 title "Molecular Orientation of Poly(ethylene naphthalate)/Poly(ethylene terephthalate) Copolymers Utilizing Polarized Raman Spectra" @default.
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• W1996131271 doi "https://doi.org/10.1021/ma011229h" @default.
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