When making medical TPU using PCL, some papers use stannous octoate, while others do not. Is stannous octoate really necessary?
Stannous organic compounds are very effective catalysts for PU synthesys in general. I am not sure about stannous octoate, but DBTL has very good selectivity towards NCO+OH reaction instead of NCO+H2O.
If isocyanate is reactive enough sometimes you can get away without usage of any catalyst. In other cases it is impractical to perform a reaction without catalyst.
What is the aim of your research?
Igors Sivacovs The aim of my research is to synthesize TPU from materials such as PCL and then evaluate its mechanical properties and biocompatibility for tissue engineering.
Sangyub Oh As I know, stannous compounds are quite hazardous. If it does concern you, you could try to test alternatives
I would suggest you contacting this company's experts for tin-free catalysts, if you wish
https://www.kingindustries.com/
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