GUO Xinglin, LI Fumian, ZHANG Shulin. HYDROGEN-BOND DEFECT OF WATER IN PVA HYDROGELS BY RAMAN SPECTRAL ANALYSIS[J]. Acta Polymerica Sinica, 2001,(3):408-411.
GUO Xinglin, LI Fumian, ZHANG Shulin. HYDROGEN-BOND DEFECT OF WATER IN PVA HYDROGELS BY RAMAN SPECTRAL ANALYSIS[J]. Acta Polymerica Sinica, 2001,(3):408-411.DOI:
The hydrogen-bond defect of water in PVA hydrogels was studied by Raman spectral analysis.The PVA hydrogels were prepared from PVA of different DP in different concentrations via freeze/thawed method.It was found that the hydrogen bond defect of water in PVA hydrogels is affected by their crystallinity which was depended on the molecular weight and concentration of PVA and also the number of freeze/thawed cycles.After swelling in water for 24 h
partial VA units were released from the crystalline regions
this means that more‘free’VA units could bond with water in PVA hydrogels
causing the decrease of C value and the increase of N value.