Polycarbonate Resins: Synthesis and Thermogravimetric Analysis

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Abstract
Resins from diphenols with an aromatic ring as side group, phosgene, and a triphenol as crosslinking agent were synthesized under phase transfer conditions. The resins obtained with a phase transfer catalyst showed higher thermal stability than those obtained without catalyst. The function of the catalyst is to transport triphenol from the aqueous phase to the organic phase. The thermal stability of the resins was related to the structure and the content of triphenol. It was found that resins derived from diphenol I exhibited higher thermal stability as the content of triphenol increased. On the other hand, when diphenol II was used, the thermal stability decreased as the content of triphenol increased, due to steric hindrance of the methyl group on the side ring. Also, a resin from the triphenol alone was synthesized in the same conditions. The kinetic parameters of the decomposition process were determined for all resins.