Solution blown superporous hydrogel nonwoven based on hydroxypropyl cellulose
A superporous hydrogel - in which the interconnecting fibers themselves are hydrogels - based on hydroxypropyl cellulose (HPC) has been produced using the the nonwoven technique solution blown. The nonwoven fibres were subsequently thermally crosslinked using citric acid as characterized by the esterbond formaton using FT-IR and the gel fraction was approximately 70%. The superporous HPC hydrogel exhibited a very fast water absorption, reaching an equilibrium absorption (80% water content) within 30 seconds. The equilibrium absorption was strongly codependent on both the fiber thickness and the pore size whereas the absorption rate was correlated with the pore size as established using standard linearized regression analysis.