A paradigm for the efficient synthesis of bio-based polycarbonate with deep eutectic solvents as catalysts by inhibiting the degradation of molecular chains was written by Wang, Weiwei;Yang, Zifeng;Zhang, Yaqin;He, Hongyan;Fang, Wenjuan;Zhang, Zhencai;Xu, Fei. And the article was included in Green Chemistry in 2021.Safety of Diphenyl carbonate The following contents are mentioned in the article:
In this study, an efficient catalytic system composed of deep eutectic solvents (DESs) was developed by adjusting the basicity of hydrogen bond donors (HBDs) to synthesize poly(isosorbide)carbonate (PIC) with high weight average mol. weight (Mw). It was demonstrated that the Mw of PIC prepared by using nearly neutral [EminOH]Cl-2EG was the highest. The results of the transesterification kinetics with different catalysts supported that the transesterification rate was significantly promoted as the basicity of DESs increased but their strong alkalinity inhibited the Mw of PIC. Therefore, the degradation of PIC was investigated to reveal the mechanism of the influence of basicity on the mol. weight of PIC. The strong alkalinity of DESs would cause the depolymerization of the macromol. chains and ultimately limit the mol. weight of the product, proving the exptl. fact that a near-neutral catalyst was more conducive to the Mw of PIC. Finally, a reasonable mechanism of synergistic catalysis was proposed based on 1H NMR spectroscopy, Fourier transform IR spectroscopy (FT-IR) and exptl. results. The metal-free, low-cost, high catalytic activity DES catalyst involved here is a practical candidate for advanced bio-based polycarbonate. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Safety of Diphenyl carbonate).
Diphenyl carbonate (cas: 102-09-0) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Safety of Diphenyl carbonate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics