Multiple melting behavior of poly(butylene succinate). II. Thermal analysis of isothermal crystallization and melting process

Abstract

The multiple melting behavior of poly(butylene succinate) (PBSu) was studied with differential scanning calorimetry (DSC). Three different PBSu resins, with molecular weights (MWs) of 1.1 × 105, 1.8 × 105, and 2.5 × 105, were isothermally crystallized at various crystallization temperatures (Tc) ranging from 70 to 97.5 °C. The Tc dependence of crystallization half‐time (τ) was obtained. DSC melting curves for the isothermally crystallized samples were obtained at a heating rate of 10 K min−1. Three endothermic peaks, an annealing peak, a low‐temperature peak L, and a high‐temperature peak H, and an exothermic peak located between peaks L and H clearly appeared in the DSC curve. In addition, an endothermic small peak S appeared at a lower temperature of peak H. Peak L increased with increasing Tc, whereas peak H decreased. The Tc dependence of the peak melting temperatures [Tm(L) and Tm(H)], recrystallization temperature (Tre), and heat of fusion (ΔH) was obtained. Their fitting curves were obtained as functions of Tc. Tm(L), Tre, and ΔH increased almost linearly with Tc, whereas Tm(H) was almost constant. The maximum rate of recrystallization occurred immediately after the melting. The mechanism of the multiple melting behavior is explained by the melt‐recrystallization model. The high MW samples showed similar Tc dependence of τ, and τ for the lowest MW sample was longer than that for the others. Peak L increased with MW, whereas peak H decreased. In spite of the difference of MW, Tm(L), Tm(H), and Tre almost coincided with each other at the same Tc. The ΔH values, that is crystallinity, for the highest MW sample were smaller than those for the other samples at the same Tc. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 2039–2047, 2005

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.…”

Correlating the morphology of poly(L-lactide)/poly(butylene succinate)/graphene oxide blends nanocomposites with their crystallization behavior

“…The double melting peaks of PBS is widely discussed in the literature, and commonly interpreted as a melting-recrystallization phenomenon. Its occurrence in the present blend nanocomposite is related to the increase in the PBS phase crystallization temperature [50][51][52][53]. The relevant nucleating ability of GO on the PBS phase can be quantitatively described, by using the nucleation efficiently scale concept introduced by Lotz et al [54] in order to define a scale of nucleation efficiency, two reference values corresponding to a minimum and maximum in the crystallization rate should be chosen.…”

Investigation on isothermal crystallization, melting behaviors, and spherulitic morphologies of multiblock copolymers containing poly(butylene succinate) and poly(1,2‐propylene succinate)

“…Obviously, triple melting peaks appear in the heating scans and are identified with T mA , T mL , and T mH from low temperature to high temperature. The multiple melting phenomenons of PBS homopolymer and copolymers have been intensively studied [11][12][13]23 and have been ascribed to the melting/recrystallization or reorganization processes taking place during the DSC heating scan. Similar viewpoint is adopted to interpret the multiple melting behaviors of multiblock copolymers.…”

“…The crystal structure, 5 morphology, 8,9 bulk crystallization, 6,8,10 and melting behaviors 6,7,[11][12][13] of PBS have been reported. Crystallization behaviors of PBS random copolymers, such as poly(butylene succinate-co-butylene terephthalate), 15 poly(butylene succinate-co-adipate), 18 poly (butylene succinate-co-butylene carbonate), 19 poly (butylene succinate-co-L-lactate) 20 and poly(butylene succinate-co-14 mol% ethylene succinate), 21 have also been investigated.…”