Reprocessable crosslinked polyurethane elastomer based on dynamic thiourethane bond exchange
발표자
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초록
내용
Thermosetting polyurethanes are a class of versatile synthetic polymers widely used in almost all the fields due to its chemical stability and robust mechanical properties. However, thermosetting polyurethane is not recycled, causing environmental problems. To overcome this problem, reprocessable crosslinked polymers based on dynamic covalent bonds have been introduced. In this work, a thermally reprocessable crosslinked polyurthane elastomer was prepared by crosslinking of isocyanate terminated polyurethane prepolymer with hyperbranched polysiloxane thiol, a multifuctional thiol, in the presence of a small amount of dibutyltin dilaurate (DBTDL) as a catalyst via a solution blend method. The structure and thermomechanical properties of the crosslinked polyurethane were characterized by FTIR analysis, solubility test, measurement of gel content, DMA. And, the reprocessability of the polyurethane network originated from thiourethane exchange reaction were evaluated by stress-relaxtion test and tensile test.