On November 30, 2020, Zhang, Hui; Cui, Xiaojing; Wang, Hongliang; Wang, Yuqi; Zhao, Yuhua; Ma, Hui; Chai, Lin; Wang, Yingxiong; Hou, Xianglin; Deng, Tiansheng published an article.Reference of 1,3-Diphenylurea The title of the article was Degradation of polycarbonate-based polyurethane via selective cleavage of carbamate and urea bonds. And the article contained the following:
Deep eutectic solvents (DESs) have attracted broad attention due to their low cost and toxicity, easy preparation, good biol. compatibility and similar characteristics to those of ionic liquids In this study, a DES system composed of choline chloride and urea has been applied for the controllable degradation of polyurethane (PU). By the combination of Fourier transform IR spectroscopy (FT-IR), NMR spectroscopy (NMR) and matrix-assisted laser anal. ionization time-of-flight mass spectrometer (MALDI-TOF-MS), the selective cleavage of carbamate and urea bonds with little damage on carbonate bonds was achieved in the DES system by the regulation of reaction conditions, which favored the recovery of both valuable polycarbonate diol (PCDL) and 3,3′-Dimethyl-[1,1′-biphenyl]-4,4′-Diamine (o-toluidine). The degradation rate of PU and the yield of PCDL reached 100% and 57.4% resp. under mild conditions (1 atm, 170°C, 8 h). A possible degradation mechanism was proposed based on the exptl. results, in which the synergistic effect of choline chloride and urea activated largely the carbamate bond and thus led to a controlled degradation of PU. The experimental process involved the reaction of 1,3-Diphenylurea(cas: 102-07-8).Reference of 1,3-Diphenylurea
The Article related to polycarbonate urethane rubber degradation deep eutectic solvent, Synthetic Elastomers and Natural Rubber: Chemical Properties Of Elastomers and other aspects.Reference of 1,3-Diphenylurea
Referemce:
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