Is POLYSORB® isosorbide a chain extender?
See answerPOLYSORB® isosorbide is a short chain diol.
It is a very interesting new chain extender for polyurethanes, especially for elastomers. The synthesized new derivatives of isosorbide are suitable also for producing urethane-isocyanuric foams, cast polyurethanes, polyurethanes adhesives, coatings and sealants*.
* http://ndl.ethernet.edu.et/bitstream/123456789/41437/1/27.pdf