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. 2018 Jun 26;10(7):706. doi: 10.3390/polym10070706

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Viscosity vs. shear rate curves of raw polyisocyanate methyl diphenyl diisocyanate (pMDI) resin (black), lignin-pMDI premix (hollow symbols), and lignin-pMDI prepolymer (solid symbols) containing 10–40% lignin; (b) storage (G′) and loss (G″) modulus of various lignin-pMDI premixes and the prepolymers at an angular frequency of 0.1 rad/s.