Crystallization Kinetics and Melting Behaviour of the Novel Biodegradable Polyesters Poly(propylene azelate) and Poly(propylene sebacate)

Abstract

Novel biodegradable poly(propylene sebacate) (PPSeb) and poly(propylene azelate) (PPAz) polyesters were synthesized and fully characterized using WAXD, standard DSC, high‐rate DSC, and modulated‐temperature DSC. Multiple‐melting behaviour, observed for samples isothermally crystallized from the melt, was attributed to sequential melting–recrystallization–remelting. Study of isothermal and nonisothermal crystallization kinetics revealed a higher crystallization rate for PPSeb compared to PPAz. The Avrami and the Lauritzen‐Hoffman models were successfully applied to DSC measurements, using also data obtained after self‐nucleation, in order to diminish the effect of primary nucleation. Finally, the effective activation energy was estimated using the differential isoconversional method of Friedman.magnified image

Characterization and Crystallization Kinetics of in situ Prepared Poly(propylene terephthalate)/SiO2 Nanocomposites

“…This finding allows predicting the K Avrami for all cooling rates, if a few experiments (let's say 4 or 5) have been carefully carried out for moderate cooling rates. Similar constants were also estimated for other polyesters like poly-(butylene succinate), [49] K Avrami ¼ 0.133 Â b 0.8 , poly(propylene sebacate), [58] …”

Self-Nucleation of Crystalline Phases Within Homopolymers, Polymer Blends, Copolymers, and Nanocomposites

“…(b) Isothermal DSC curves recorded after applying the procedure indicated in (a). Reproduced from Müller et al [96] with permission of The Royal Society of Chemistry terephthalate)/SiO 2 nanocomposites [146], poly(propylene azelate) [147], poly(propylene sebacate) [147], poly(ethylene azelate) [148], sindiotactic poly(propylene) (sPP) [69,123], poly(propylene terephthalate) [149], poly(trimethylene terephthalate) [76], and poly(lactic acid) [150].…”

Biobased copolyesters from renewable resources: synthesis and crystallization kinetics of poly(propylene sebacate-co-isosorbide sebacate)

“…8,53 Interpretations for the multiple melting behavior are mainly as follows: (a) melting of crystals with different lamellar thickness, perfection or stability, (b) melting-recrystallization-remelting processes, (c) physical aging and/or relaxation of the rigid amorphous fraction, (d) different molecular weight species. 16,54,55 In order to probe the melting mechanism of P(PSe-co-IS) copolymers, TMDSC is conducted to analyze the melting behaviors.…”