Polycarbonate diols (PCDLs) are known as important intermediates for the manufacture of novel polyurethanes. In this work, PCDLs were prepared via the reaction of hexane-1,6-diol (HD) and dimethyl carbonate (DMC) using calcined MgAl hydrotalcites (HTc) as solid base. The effects of preparative parameters of the catalysts and reaction conditions on the transesterification reaction were investigated. X-ray diffraction (XRD), thermogravimetric analysis-differential scanning calorimetry (TG-DSC), CO 2 temperature-programmed desorption (CO 2 -TPD), and Brunauer-Emmett-Teller (BET) techniques were used to characterize the HTc. The experimental results showed that the pore structure of the catalysts played a crucial role for the synthesis of PCDLs with high efficiency.
Polycarbonate diols (PCDLs) are known as important intermediate for the manufacture of novel polyurethanes. In this work, a series of KF loaded oxides and alumina doped with potassium halides were prepared and employed as the catalysts for the PCDL synthesis via the reaction of hextane-1, 6-diols (HD) and dimethyl carbonate (DMC) followed by vacuum oligomerization. Experimental results indicated that among the catalysts tested, KF/Al 2 O 3 exhibited the best catalytic activity. Moreover, the catalyst could be reused for three times with acceptable catalytic activity. The basic centres with medium and strong strength generated through the interaction between KF and Al 2 O 3 were catalytically active for the reaction.
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