posted on 2021-04-30, 10:18authored byP. Ortiz-Serna, M. Carsí, Mario Culebras, Maurice N. Collins, María Jesús Sanchis
The relaxation behavior of two lignins (Alcell organosolv, OSL, and hydroxypropyl modified Kraft, ML) and bio-based thermoplastic polyurethane (TPU) blends have been studied by Differential scanning calorimetry (DSC), Dynamic-mechanical analysis (DMA) and Dielectric relaxation spectroscopy (DRS). The effect of blending on the glass and local relaxation processes as a function of composition, frequency, and temperature has been assessed. The dielectric spectra were resolved into dipolar relaxations as well as conductive processes for differing blend compositions. Characteristic relaxation times, activation energies and dielectric relaxation strengths of lignin/xTPU blends were also investigated. It was found that blending suppresses the α-relaxation process of the blends compared to virgin TPU. On the other hand, while the position of the β-relaxation was not influenced by blending, a reduction of the activation energies, Ea, of this process was observed in the lignin/xTPU blends. Finally, changes are observed in the conductivity behavior of both blends, with conductivity processes more favorable for the OSL/xTPU blends.
History
Publication
International Journal of Biological Macromolecules;158, pp. 1369-1379
Publisher
Elsevier
Note
peer-reviewed
Other Funding information
Spanish Ministry of Economy and Competitiveness, Horizon 2020, European Union (EU)
Rights
This is the author’s version of a work that was accepted for publication in International Journal of Biological Macromolecules. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Biological Macromolecules Volume 158, 1 September 2020, Pages 1369-1379, https://doi.org/10.1016/j.ijbiomac.2020.04.261