Abstract
The application of two-trace two-dimensional (2T2D) correlation spectroscopy to dry-treated and wet-treated PA 6 is presented to elucidate the molecular-level variation of the polymer system induced by the water absorption. A substantial level of decrease in Young modulus are observed when the PA 6 is subjected to a wet treatment. Fine details of the change in the corresponding spectral feature are examined by 2T2D near-infrared (NIR) correlation spectroscopy. The observed correlation pattern in the asynchronous correlation spectra reveals that the water molecule absorbed by the PA 6 works as a plasticizer to increase the chain mobility by disintegrating the H-bonded bridge between the PA chains especially in the amorphous region. The disintegration of the H-bonding network, in turn, deteriorate the elastic property of the PA 6. On the other hand, the increased chain mobility also triggers chain-folding of the PA chains, eventually leading to the development of additional crystalline structure. Consequently, the absorption of the water molecules essentially induces the populational change in the crystalline and amorphous structures as well as the disruption of the H-bonding between the amorphous chains.
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