| 초록 |
Poly(bisphenol-A carbonate) (PC) is a widely used amorphous polymer in daily life. While the theoretical equilibrium melting temperature of PC is known as T0m = 318ºC, most of reported crystallization methods provide much lower values, implies that most of PC crystallites are far from the ideal equilibrium structure. We reported crystallization of PC by thermal quenching of PC and benzoic acid (BA) mixture. After BA removal, PC exhibited a clear endothermic melting transition at Tm = 225ºC. The PC crystals exhibited 1-D crystals structure due to conformation in PC backbone chain. Surprisingly, the melting point sharply jumped to the higher temperature, T’m = 285ºC upon annealing at 180ºC for a few hours, which was attributed to the crystalline transition. The new melting point was closer to the equilibrium melting temperature, while taking much shorter time than previous researches. |
