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Study on the crystallization of poly(butylene azelate-co-butylene succinate) copolymers
Díaz Andrade, Angélica María; Franco García, María Lourdes; Puiggalí Bellalta, Jordi
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. PSEP - Polimers Sintètics: Estructura i Propietats. Polimers Biodegradables.
Poly(butylene azelate-co-butylene succinate) samples with different azelate/succinate ratios were synthesized and characterized. Calorimetric data indicate a semicrystalline character for all copolyesters studied and a melting point depression that could be interpreted on the basis of complete exclusion of comonomers from well organized lamellae. Crystallization first occurred through the succinate rich segments, which resulted in a peculiar behavior of copolymers having an intermediate composition. In this case, crystallization of azelate segments was paradoxically enhanced when samples were quenched. Equilibrium melting temperatures significantly decreased with increasing comonomer content compared to those of the corresponding homopolymers. Incorporation of comonomers had a distinct effect on the secondary nucleation constant depending on the composition as deduced from Lauritzen and Hoffman analysis. Thus, azelate units clearly increased the nucleation constant of copolymers rich on succinate units, whereas the incorporation of succinate units had a lower influence on the constant of copolyesters having high azelate content
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria química
Azelaic acid
Succinic acid
Random copolymers
Thermal properties
Secondary nucleation
Attribution-NonCommercial-NoDerivs 3.0 Spain

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