2. Materials and Methods 2.1. Materials Di-(1-hydroxylundecyl) selenide (DHSe), polyethylene glycol (PEG), polypropylene glycol (PPG), 1,6-hexamethylene diisocyanate (HMDI), dibutyltin dilaurate (DBT), and paraplast plus were supplied by Sigma-Aldrich (St. Louis, MO, USA). Dulbecco's ...