Coupling of poly(lactic acid) with a polyurethane elastomer by reactive processing

Bedő, Dániel and Imre, Balázs and Domján, Attila and Schön, Peter and Vancsó, Julius G. and Pukánszky, Béla (2017) Coupling of poly(lactic acid) with a polyurethane elastomer by reactive processing. EUROPEAN POLYMER JOURNAL, 97. pp. 409-417. ISSN 0014-3057

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A segmented polyurethane elastomer (PU) was synthesized in poly(lactic acid) (PLA) melt by reactive processing. The isocyanate component was anticipated to react with the end-groups of PLA resulting in the formation of block-copolymers. The stoichiometry of the functional groups was optimized in the preliminary experiments. Two different processing methods were compared in the further experiments: conventional mixing of PU with PLA (PLA/PU), and reactive blending (PLA-b-PU). The comparison of the structure and properties of compatibilized reactive blends and conventional physical blends clearly shows the benefits of reactive processing. Coupling resulted in a finer dispersion of the particles in the matrix leading to better mechanical properties in the reactive blend. The successful synthesis of PLA-b-PU block copolymers was confirmed by NMR spectroscopy. The isocyanate component was found to react only with the hydroxyl end-groups of PLA, while the formation of amide and acylurea groups was not detected on the carboxyl end.

Item Type: Article
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Q Science / természettudomány > QD Chemistry / kémia
T Technology / alkalmazott, műszaki tudományok > T2 Technology (General) / műszaki tudományok általában
Depositing User: Dr. János/J Móczó
Date Deposited: 27 Nov 2017 15:28
Last Modified: 27 Nov 2017 15:28

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