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Cold crystallization and multiple melting behavior of poly(l-lactide) in homogeneous and in multiphasic epoxy blends

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Abstract

Cold crystallization and melting of poly(l-lactide) (PLLA) blended with an uncured or with an amino-cured epoxy resin (diglycidyl ether of bisphenol-A [DGEBA]) were investigated. It was found that the uncured PLLA/DGEBA blends were miscible, as they exhibited a single composition-dependent glass transition temperature (T g). Melting point depression measurements indicated the existence of some type of interaction between the blend components, which was confirmed by Fourier transform infrared spectroscopy. Depending on the crystallization conditions and on the blend composition, a mixture of α and α′ crystals have been detected in PLLA and in uncured DGEBA/PLLA blends when crystallized from the glassy state. At high DGEBA contents, preferably imperfect α crystals are formed. On the contrary, at low DGEBA contents, the α′ form predominates and an exotherm associated to the α′–α transformation appears on the differential scanning calorimetry (DSC) scan before the main melting peak. Upon curing, the system transforms from a homogeneous mixture with a single refractive index into an opaque multiphasic one, as revealed by the existence of two T gs in the DSC scans. These cross-linked immiscible blends displayed a single crystallization exotherm which scarcely changed with composition, and PLLA cold crystallized mainly into the α′ form from an almost pure PLLA phase; subsequently, the α′ crystals transform into the α form just before melting during the DSC scan.

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Acknowledgements

The authors gratefully acknowledge the Ministerio de Educación y Ciencia of Spain (project MEC-MAT 2005-03358) and the Gobierno Vasco (project Saiotek 2009-2010) for funding this research.

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Authors and Affiliations

  1. Department of Science and Technology of Polymers, Faculty of Chemistry, University of the Basque Country, Paseo Manuel de Lardizábal 3, 20018, Donostia-San Sebastián, Spain

    M. Itxaso Calafel, Pedro M. Remiro, M. Milagros Cortázar & M. Elena Calahorra

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  1. M. Itxaso Calafel
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  2. Pedro M. Remiro
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  3. M. Milagros Cortázar
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  4. M. Elena Calahorra
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Correspondence to Pedro M. Remiro.

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Calafel, M.I., Remiro, P.M., Cortázar, M.M. et al. Cold crystallization and multiple melting behavior of poly(l-lactide) in homogeneous and in multiphasic epoxy blends. Colloid Polym Sci 288, 283–296 (2010). https://doi.org/10.1007/s00396-009-2156-3

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  • DOI: https://doi.org/10.1007/s00396-009-2156-3

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