Abstract
Despite of its non-toxicity and eco-friendliness, isosorbide (ISB) polycarbonate is difficult to use solely due to its excessive brittleness. To overcome this drawback, it is necessary to prepare high-molecular-weight ISB-based copolycarbonates with flexible diol monomers. In this research, a series of copolycarbonates of ISB, hydrogenated bisphenol A (HBPA), and diphenyl carbonate (DPC) were synthesized by melt polycondensation process using sodium methoxide (NaOMe) as a catalyst. Using NaOMe catalyst, high molecular weight ISB/HBPA copolycarbonates (Mw = 73,000–103,000 g/mol) were obtained. The incorporation of thermally stable and flexible HBPA improved the thermal stability of the copolycarbonates and the flexibility of the polymer chains to demonstrate the possibility of producing soft polycarbonates which are more environmentally friendly and can overcome the brittleness of the ISB polycarbonates.
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