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Water Absorption Behavior in Poly(Ethylene Terephthalate)-Poly(Ethylene Glycol) Block Copolymer Matrix by Two-Dimensional Correlation Spectroscopy

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Abstract:

The absorption behavior of water in poly (ethylene terephthalate)-poly (ethylene glycol) (PETG) block copolymers was investigated using the time-resolved FTIR-ATR (Fourier Transform Infrared Attenuated Total Reflection) spectra. The data was analyzed by two-dimensional correlation spectra (2D-COS), which provided relevant and complementary information on the absorption mechanism and the molecular interactions formed (H-bonding). It was found that there were two kinds of water molecules, named bound water and free water in absorption process. The delicate relationship between dynamic water absorption behavior and the morphology resulting from phase separation was also discussed. Furthermore, two-dimensional correlation analyses revealed that in the absorption process, water first diffuses into the continuous soft-rich PEG phase and then into the hard-rich PET domains, forming hydrogen bonds with-O-groups prior to that of free volume.

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Periodical:

Materials Science Forum (Volume 848)

Pages:

111-119

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.848.111

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Online since:

March 2016

Authors:

Peng Ji, Zhen Lin Jiang, Jin Jin, Xiang Lin Chen, Chao Sheng Wang, Hua Ping Wang

Keywords:

Absorption Behavior, PETG Copolymer, Phase Separation, Time-Resolved FTIR-ATR, Two-Dimensional Correlation Spectra

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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