Small-molecule-induced miscibility of isosorbide-based polycarbonate with bisphenol A polycarbonate

In this study, we investigated the influence of the small molecule 4,4′-thiobis(6- tert -butyl- m -methyl phenol) (AO300) on the miscibility of poly(isosorbide- co -1,4-cyclohexanedimethanol carbonate) (I c C–PC) with bisphenol A polycarbonate (BPA–PC) through the formation of hydrogen-bonding networks. Differential scanning calorimetry and morphological observation revealed that the initially, immiscible BPA–PC/I c C–PC blends become miscible through the addition of small molecules. Fourier transform infrared spectroscopy confirmed that intermolecular hydrogen bonds formed between the hydroxyl groups of AO300 and the carbonyl groups of the studied polycarbonates. These polycarbonates exhibited different hydrogen-bonding behaviors and various degrees of glass-transition temperature composition dependence. Dynamic mechanical analysis demonstrated that AO300 played an antiplasticization role in the BPA–PC/I c C–PC blends with improved storage moduli. To our knowledge, this article is the first to describe the miscibility of isosorbide-based polycarbonate with BPA–PC. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44537.