studies on water absorbency of polyacrylamide hydrogels in belgium

studies on water absorbency of polyacrylamide hydrogels in belgium
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  • Why does polyacrylamide hydrogel become a glassy solid?
  • A rubbery-glassy transition can be observed at 26% water content, below which the polyacrylamide hydrogel becomes like a glassy solid. We conjecture that this transition point may relate with the different water loss process under dehydration. As the water content decreases, the free water can be lost at first, and then the bound water [ 28 ].
  • How does water content affect polyacrylamide hydrogel absorbance?
  • As shown in Fig. 6 b, polyacrylamide hydrogels show significant peaks at ∼ 1605 c m − 1 (N – H bending) and ∼ 1652 c m − 1 (C O stretching) [ 39 ]. The maximum absorbance A m a x intensifies with decreasing water content, suggesting that the decreasing water content results in increasing surface chain density.
  • Do polyacrylamide hydrogels have higher adhesion energy?
  • Specifically, at extremely low water content of 30%, polyacrylamide hydrogels exhibit one order of magnitude higher adhesion energy than that at relatively high water content. It is also found that with the decrease of water content, the maximum peeling force presents a similar trend to that of adhesion energy.
  • What is the relationship between adhesion and network properties of polyacrylamide hydrogels?
  • Based on the indentation test, Lai et al. studied the relation between adhesion properties (i.e., adhesion energy) and network properties (i.e., initial polymer mass concentration) of polyacrylamide hydrogels [27 ]. However, they only considered a small range of water content or polymer mass concentration.