Multiple melting behavior of poly(butylene succinate)

• DOI: 10.1016/j.eurpolymj.2007.05.013
• Publication Date: 2007-05-25T12:23:21Z
• Authors: Xiaohong Wang; Jianjun Zhou; Lin Li
• Keywords: Recrystallization (geology); Thermal Stability; Isothermal process; Exothermic reaction

The multiple melting behavior of poly(butylenes succinate) (PBS) isothermally crystallized from the melt was investigated using differential scanning calorimetry (DSC), temperature modulated DSC (MDSC) and polarized optical microscopy. PBS exhibits at most four melting endotherms (denoted as Tm1, Tm2, Tm3, and Tm4 from high to low temperatures) and a crystallization exotherm (denoted as Tre) in the DSC heating trace. Multiple melting endotherms were observed even at high heating rates. The origins of each endothermal and exothermal peak were discussed in detail. It is suggested that: (i) the crystallization exothermic peak, Tre, relates to the recrystallization of the melt of the crystallites with lower thermal stability; (ii) the Tm1 is ascribed to the melting of crystallites formed through recrystallization; (iii) two crystal populations with different thermal stability are responsible for the Tm2 and Tm3; (iv) the Tm4, which is the annealing peak, represents the transition of the rigid amorphous fraction (RAF) from solid-like RAF into liquid-like amorphous fraction.