Melting behaviors, crystallization kinetics, and spherulitic morphologies of poly(butylene succinate) and its copolyester modified with rosin maleopimaric acid anhydride

Abstract

This article investigated the melting behaviors, crystallization kinetics, and spherulitic morphologies of poly(butylene succinate) (PBS) and its copolyester (PBSR) modified with rosin maleopimaric acid anhydride, using wide‐angle X‐ray diffraction, differential scanning calorimeter (DSC), and polarized optical microscope. Subsequent DSC scans of isothermally crystallized PBS and PBSR exhibited two melting endotherms, respectively, which was due to the melt‐recrystallization process occurring during the DSC scans. The equilibrium melting point of PBSR (125.9 °C) was lower than that of PBS (139 °C). The commonly used Avrami equation was used to describe the isothermal crystallization kinetics. For nonisothermal crystallization studies, the model combining Avrami equation and Ozawa equation was employed. The result showed a consistent trend in the crystallization process. The crystallization rate was decreased, the perfection of crystals was decreased, the recrystallization was reduced, and the spherulitic morphologies were changed when the huge hydrogenated phenanthrene ring was added into the chain of PBS. The activation energy (ΔE) for the isothermal crystallization process determined by Arrhenius method was 255.9 kJ/mol for PBS and 345.7 kJ/mol for PBSR. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 900–913, 2006

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

“…The possible reason might be that the secondary crystallization of PBS was more apparent than that of PBSTMA, which was similar to other report. 13,30 However, Ozawa took no account of the secondary crystallization and assumed that the Ozawa exponent was constant over the entire crystallization process. 28 Therefore, it failed to describe the nonisothermal crystallization process of PBS because of its serious secondary crystallization.…”

Crystallization Kinetics of Biodegradable Poly(butylene succinate) under Isothermal and Non‐Isothermal Conditions

“…[7][8][9][13][14][15] Nonisothermal crystallization of PBSu has been reported in a note by Qiu et al [16] Finally, the preparation and behavior of blends of PBSu or related copolymers have also been described in the literature by several authors. [17][18][19][20][21][22][23][24][25][26][27][28][29] In this work, a detailed study was carried out on the crystallization kinetics of PBSu under both isothermal and non-isothermal conditions using differential scanning calorimetry (DSC) and polarized light microscopy (PLM). A comprehensive analysis is presented using different macroscopic models in order to test the validity of the equations usually elaborated to describe polymer crystallization.…”

Mechanisms and kinetics of thermal degradation of poly(butylene succinate‐co‐propylene succinate)s

“…Copolymers have higher degradation rates than homopolymers, basically because they have lower crystallinity. Therefore, some tests on PBSu and its various copolyesters have been conducted to examine their morphologies, crystallization kinetics, and melting behaviors 9, 14–17. Poly(propylene succinate) (PPSu), with an odd number of methylene groups in the diol monomer, has low crystallinity.…”