Correlations among Miscibility, Structure, and Properties in Thermoplastic Polymer/Lignin Blends

Romhányi, Vivien and Kun, Dávid and Pukánszky, Béla (2018) Correlations among Miscibility, Structure, and Properties in Thermoplastic Polymer/Lignin Blends. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 6 (11). pp. 14323-14331. ISSN 2168-0485

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Abstract

Blends were prepared from an industrial lignosufonate and seven matrix polymers with different chemical structures. The components were homogenized in an internal mixer and plates were compression molded for further testing. The blends were characterized by a number of methods: structure by scanning electron microscopy, interactions by dynamic mechanical thermal analysis, and differential scanning calorimetry, while mechanical properties were characterized by tensile testing. Only weak dispersion forces develop in polyolefins, and the properties of the blends are poor. Aromatic, π electron interactions are stronger and H-bonds result in reasonable compatibility and mechanical properties. The best properties were achieved with the ionomer as matrix in which the combination of hydrogen bridges and ionic bonds results in good compatibility and properties. The strength of interactions was estimated with the Flory–Huggins interaction parameter, and good quantitative correlations were found among miscibility, structure, and properties, which could be predicted with simple theories. Although blends with acceptable properties could be prepared from the ionomer and lignin, the deformability of most blends was very small limiting practical application. The plasticization or chemical modification of lignin may lead to materials which can be used in industrial practice

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