If I dissolve a polyester urethane resin in THF, not distruge bonding resin? Or as another alternative ?
Typically, polyester urethanes are dissolved in dimethyl formamide as a 18 to 22 % b. w. solution, but dimethyl acetamide maybe used as well or dimethyl sulphoxide. To use THF will lead to lower concentrations. In any case, at ambient temperature only the hydrogen bonds are disrupted, at temperatures > 100°C allophanate or biurete groups from side reactions maybe cleaved, esp. if there are amine impurities in the solvents. Therefore, only highly purified and dried (just before use) solvents should be used.
Try Hot water or steam this will cleave the polyester and probably deteriorate the polymer
If your PUR contains crosslinks (which is frequently the case even in polyurethanes which should be linear, because of secondary reactions) it may not dissolve at all.
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