Multiple melting behavior of poly(butylene succinate). I. Thermal analysis of melt‐crystallized samples

Abstract

The multiple melting behavior of poly(butylene succinate) (PBSu) was studied with differential scanning calorimetry (DSC). Three different PBSu resins, with molecular weights of 1.1 ϫ 10 5 , 1.8 ϫ 10 5 , and 2.5 ϫ 10 5 , were cooled from the melt (150°C ) at various cooling rates (CRs) ranging from 0.2 to 50 K min Ϫ1 . The peak crystallization temperature (T c ) of the DSC curve in the cooling process decreased almost linearly with the logarithm of the CR. DSC melting curves for the melt-crystallized samples were obtained at 10 K min Ϫ1 . Double endothermic peaks, a high-temperature peak H and a low-temperature peak L, and an exothermic peak located between them appeared. Peak L decreased with increasing CR, whereas peak H increased. An endothermic shoulder peak appeared at the lower temperature of peak H. The CR dependence of the peak melting temperatures [T m (L) and T m (H)], recrystallization temperature (T re ), and heat of fusion (⌬H) was obtained. Their fitting curves were obtained as functions of log(CR). T m (L), T re , and ⌬H decreased almost linearly with log(CR), whereas T m (H) was almost constant. Peak H decreased with the molecular weight, whereas peak L increased. It was suggested that the rate of the recrystallization decreased with the molecular weight. T m (L), T m (H), T re , and T c for the lowest molecular weight sample were lower than those for the others. In contrast, ⌬H for the highest molecular weight sample was lower than that for the others. If the molecular weight dependence of the melting temperature for PBSu is similar to that for polyethylene, the results for the molecular weight dependence of PBSu can be explained.

Influence of Fiber Content on Properties of Oil Palm Mesocarp Fiber/Poly(butylene succinate) Biocomposites

“…6, the DSC heating thermogram of neat PBS showed two endothermic peaks due to the melting and re-crystallization mechanism (Yasuniwa and Satou 2002). The first melting peak was ascribed to the melting of less perfect crystals.…”

Non‐isothermal crystallization kinetics and melting behaviors of poly(butylene succinate) and its copolyester modified with trimellitic imide units

“…But for PBSTMA the appearance of the Peak L was seen only when the cooling rate was lower than 58C/min. Yasuniwa and Satou 33 and Qiu et al 34 also found that PBS showed double melting peaks after crystallizing nonisothermally from the melt at a constant cooling rate, which was ascribed to the re-crystallization and melting mechanism. That was to say, the low-temperature and high-temperature peaks in the Figure 8 were attributed to the melting of some amount of the primary crystallites and the melting of the more stable crystals formed through the melt-recrystallization process during the heating scan, respectively.…”

Synthesis and characterization of novel poly(butylene succinate-co-2-methyl-1,3-propylene succinate)s

“…The reason is due to the melting%recrystal-lization%remelting behavior [11,12,15,17] of PBSu-rich copolymers during the heating process. In the case of PBMPSu 50/50, the T m value was 50.2°C, when the specimen was maintained at RT for more than three days.…”

“…The crystalline structure [5][6][7][8][9], and crystallization and melting behavior [10][11][12][13][14][15][16][17][18] of PBSu have been investigated extensively. PBSu has a relatively low biodegradation rate because of its high crystallization rate and high crystallinity.…”