Abstract
In the present work, time-resolved attenuated total reflection Fourier
transform infrared spectroscopy (ATR-IR), near-infrared (NIR) spectroscopy, and
generalized two-dimensional (2D) correlation analysis were used to investigate water
diffusion processes and the state of water molecules in six different epoxy resins.
Positron annihilation lifetime spectroscopy (PALS) experimental results and IR
results suggested that water diffusion is controlled by local chain reorientation
and bond dissociation of water molecules from epoxy networks. Dynamic mechanical
analysis (DMA) results of glass transition temperatures of epoxy resins after
immersion in hot water correlated well with the PALS and IR results. In addition,
four types of water molecules, termed nonbonded (S<sub>0</sub>), single bonded
(S<sub>1</sub>), loosely double hydrogen bonded (S<sub>2L</sub>), and tightly
double bonded (S<sub>2T</sub>), were detected. It was likewise found, as verified by
rough estimation, that water molecules with double hydrogen bonds mostly
accomplished diffusion.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription
Add to BibSonomy