We are making polyurethane foam wound dressing and the amount of water absorption is very important. This foam is made of pre-polymer contains TDI and PEG.
The water uptake depends on the amound and hydrophilicity of the soft segpent. See e.g. Article Solvent free synthesis and structural evaluation of polyuret...
In this article the water upatake of the PUR synthesized form PEG can reach 70-80%, which is reduced if a part of PEG is repalced by polycaprolactone. The same is true if you use PEG-PPG copolymer soft segment. If you want to reach even higher water uptake, you have to use polyols with ionic comonomers in the soft segment.
Dear all, introduction of dangling chains (lateral branches) is the most investigated strategy for enhanced swellability and water uptake. It may be introduced for exemple using monomethylhydroxyl-PEG fragments. Worth to mention is that all types PU's are prone to hydrolytic degradation, so it is important to consider this aspect while studying PU water uptake. My Regards
1. This prepolymer can directly react with water to produce foam in the presence of catalyst and surfactant.
2. In the presence of catalysts and surfactants, react with hydrophilic polyether polyols to produce the desired foam.
The open porosity and pore size directly affect the water absorption, which can be adjusted by surfactants。
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