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- W2000747822 abstract "This study was aimed at comparatively investigating the hydrolysis of crystalline and amorphous poly-(ethylene terephthalate) films by alkali and cutinase. Changes of surface properties were investigated by FTIR spectroscopy (ATR mode). The A 1341 / A 1410 and I 1120 / I 1100 absorbance ratios, and the full width at half maximum of the carbonyl stretching band (FWHM 1715 ) were used to evaluate the polymer crystallinity and its changes upon hydrolysis. The effect of different treatments on chain orientation was evaluated by calculating R ratios of appropriate bands. The spectroscopic indexes showed that both alkali and enzyme treatments induced structural and conformational rearrangements with a consequent increase in crystallinity in both amorphous and crystalline films. The crystalline PET film was modified more strongly by alkali than by cutinase, while the opposite occurred for the amorphous one. The trend of the water contact angle (WCA) clearly indicates that alkali is more effective than cutinase in enhancing hydrophilicity of PET films and that the effect is stronger on amorphous than on crystalline films. The values of WCA correlate well with the FTIR indexes calculated from the spectra of hydrolyzed crystalline PET films. The mechanism of the surface hydrolysis of PET by alkali and cutinase is discussed." @default.
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- W2000747822 date "2010-09-01" @default.
- W2000747822 modified "2023-10-13" @default.
- W2000747822 title "Surface structure and properties of poly-(ethylene terephthalate) hydrolyzed by alkali and cutinase" @default.
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- W2000747822 doi "https://doi.org/10.1016/j.polymdegradstab.2010.06.011" @default.
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