Improvement of the compatibility between poly(3-hydroxybutyrate) and poly(e-caprolactone) by reactive extrusion with dicumyl peroxide
[EN] Poly(3-hydroxybutyrate) is a biodegradable aliphatic polyester obtained through bacterial fermentation that has gained attention in the last few years; nevertheless, its industrial applications are restricted because of some drawbacks related to its high stiffness and fragility which is associa...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/80819 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/80819 |
| Access Level: | acceso abierto |
| Palabra clave: | Poly(3-hydroxybutyrate) Poly(e-caprolactone) Dicumyl peroxide Reactive compatibilization Blends CIENCIA DE LOS MATERIALES E INGENIERIA METALURGICA |
| Sumario: | [EN] Poly(3-hydroxybutyrate) is a biodegradable aliphatic polyester obtained through bacterial fermentation that has gained attention in the last few years; nevertheless, its industrial applications are restricted because of some drawbacks related to its high stiffness and fragility which is associated to its high crystallinity. In this work, poly(3-hydroxybutyrate) (P3HB) was melt blended with poly(e-caprolactone) (PCL) at a constant weight ratio of 75/25 (P3HB/PCL) by reactive extrusion with different contents of dicumyl peroxide (DCP) in the 0 1 wt% range. The effects of the DCP load on mechanical, thermal and morphology of the P3HB/PCL blend were studied. Results showed a positive increase in the elongation at break and the impact-absorbed energy of 91% and 231% respectively with regard the uncompatibilized P3HB/PCL blend by the addition of 1 wt% DCP, being this a clear evidenced of the improved compatibility between these polymers. Moreover, morphology of DCP-compatibilized P3HB/PCL blend obtained by field emission electron microscopy (FESEM) and atomic force microscopy (AFM) showed a remarkable decrease in the particle size of poly(e-caprolactone)-rich domains randomly dispersed in the poly(3-hydroxybutyrate). In addition, both FESEM and AFM also revealed improved interfacial adhesion between P3HB- and PCL-rich phases with a noticeable decrease in the gap between them. Addition of 1 wt% DCP also contributes to lowering the degree of crystallinity of PHB by 14% in the blend and other thermal properties are not highly affected by the reactive extrusion with DCP. ©2016 Elsevier Ltd. All rights reserved. |
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