Non-isothermal crystallization kinetics and morphology of poly(3-hydroxybutyrate)/pluronic blends
Poly(3-hydroxybutyrate), PHB, was mixed with pluronic F68 or F127 to obtain polymer blends with increased hydrophilicity and thus suitable for biomedical applications. Blend films were obtained by thermomolding keeping the pluronic content ≤17 wt% to avoid immiscibility. The non-isothermal crystalli...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | inglés |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/25285 |
| Acceso en línea: | https://hdl.handle.net/10272/25285 |
| Access Level: | acceso abierto |
| Palabra clave: | Biopolymer blends Non-isothermal crystallization Morphology Rheology Differential Scanning Calorimetry X-ray Scattering 3303 Ingeniería y Tecnología Químicas |
| Sumario: | Poly(3-hydroxybutyrate), PHB, was mixed with pluronic F68 or F127 to obtain polymer blends with increased hydrophilicity and thus suitable for biomedical applications. Blend films were obtained by thermomolding keeping the pluronic content ≤17 wt% to avoid immiscibility. The non-isothermal crystallization kinetics of the blends was investigated by both differential scanning calorimetry (DSC) and rheology. PHB and pluronics were found to be miscible in the melt with both pluronics acting as diluent. Polarized optical microscopy (POM) and X-ray scattering (SAXS, WAXS) revealed that blending increased the overall crystallinity, promoting crystal ordering through the formation of more resolved, ring-banded spherulites. However, the different diffusion rate of pluronic F68 and F127 led to a different segregation extent of pluronic in the extralamellar domains with different final morphological homogeneity. The mechanical properties of the blends intimately correlated with the structure at the nano and microscale |
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