TY - JOUR
T1 - Exploring the role of lignin structure in molecular dynamics of lignin/bio-derived thermoplastic elastomer polyurethane blends
AU - Ortiz-Serna, P.
AU - Carsí, M.
AU - Culebras, M.
AU - Collins, M. N.
AU - Sanchis, M. J.
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2020/9/1
Y1 - 2020/9/1
N2 - 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.
AB - 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.
KW - Bio-based blends
KW - Lignin
KW - Relaxation behavior
KW - Thermal analysis
KW - Thermoplastic elastomeric polyurethane
UR - http://www.scopus.com/inward/record.url?scp=85085981764&partnerID=8YFLogxK
U2 - 10.1016/j.ijbiomac.2020.04.261
DO - 10.1016/j.ijbiomac.2020.04.261
M3 - Article
C2 - 32376254
AN - SCOPUS:85085981764
SN - 0141-8130
VL - 158
SP - 1369
EP - 1379
JO - International Journal of Biological Macromolecules
JF - International Journal of Biological Macromolecules
ER -