Aliphatic polyesters, synthesized from monomers obtainable from biomasses, are an interesting class of materials which combine excellent properties, such as biodegradability and biocompatibility, with quite poor physical properties and often high costs. For this reason modification of aliphatic polyesters have recently attracted considerable attention. In particular, by considering the poly(alkylene dicarboxylate)s, linear aliphatic polyesters synthesized by combination of diols with dicarboxylic acids, one of the possible strategies to improve the thermo-mechanical characteristics is the chemical modification of the macromolecular architecture, by addition of a multifunctional monomer. Here we present the results of the chemical modification of the poly(butylene dodecanoate), derived from 1,4- butanediol and 1,12-dodecanedioic acid, by addition of glycerol, a threefunctional alcohol, byproduct of the production of biodiesel. The synthesis of the novel polyesters, characterized by a glycerol content varying from 0.5 to 2.0 mol%, has been optimized. The analysis of the molecular structure, carried out by 1H NMR spectroscopy, and the chemical properties of the materials (for example, solubility) reveal a complex polymer network, due to the reactivity of all the –OH groups of glycerol. Even if the thermal properties of the crystal phase seem not affected by the presence of the glycerol, the mechanical properties change with respect to those of the homopolymer. Moreover, as the materials, during their service life, can be submitted to photodegradation, as well as biodegradation and hydrolytic degradation, due to outdoor use, the durability is a property of great importance. Therefore, a study of the photodegradability of the novel polyesters has been carried out and attention has been paid on the molecular structure evolution upon photodegradation monitored by melt rheology. The different mechanisms occurring during photoageing, chain scissions and three-dimensional network formation, have been identified.

New polymers from renewable resources: synthesis, characterization, and photodurability of aliphatic polyesters containing glycerol

CELLI, ANNAMARIA;MARCHESE, PAOLA;SULLALTI, SIMONE;BERTI, CORRADO;
2010

Abstract

Aliphatic polyesters, synthesized from monomers obtainable from biomasses, are an interesting class of materials which combine excellent properties, such as biodegradability and biocompatibility, with quite poor physical properties and often high costs. For this reason modification of aliphatic polyesters have recently attracted considerable attention. In particular, by considering the poly(alkylene dicarboxylate)s, linear aliphatic polyesters synthesized by combination of diols with dicarboxylic acids, one of the possible strategies to improve the thermo-mechanical characteristics is the chemical modification of the macromolecular architecture, by addition of a multifunctional monomer. Here we present the results of the chemical modification of the poly(butylene dodecanoate), derived from 1,4- butanediol and 1,12-dodecanedioic acid, by addition of glycerol, a threefunctional alcohol, byproduct of the production of biodiesel. The synthesis of the novel polyesters, characterized by a glycerol content varying from 0.5 to 2.0 mol%, has been optimized. The analysis of the molecular structure, carried out by 1H NMR spectroscopy, and the chemical properties of the materials (for example, solubility) reveal a complex polymer network, due to the reactivity of all the –OH groups of glycerol. Even if the thermal properties of the crystal phase seem not affected by the presence of the glycerol, the mechanical properties change with respect to those of the homopolymer. Moreover, as the materials, during their service life, can be submitted to photodegradation, as well as biodegradation and hydrolytic degradation, due to outdoor use, the durability is a property of great importance. Therefore, a study of the photodegradability of the novel polyesters has been carried out and attention has been paid on the molecular structure evolution upon photodegradation monitored by melt rheology. The different mechanisms occurring during photoageing, chain scissions and three-dimensional network formation, have been identified.
2010
Celli A.; Marchese P.; Sullalti S.; Berti C.; Commereuc S.; Verney V.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/108931
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