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. 2019 Aug 29;7:565. doi: 10.3389/fchem.2019.00565

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Copyright © 2019 Glasser.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Early lignin-containing structural materials—Polyurethane foams using bleached and unbleached HPL (see Figure 4) according to Hsu and Glasser (1975) (A), and foams according to Lora and Glasser (2002) (B); polyacrylate sheet (C) according to Wang and Glasser (1989); and solvent-cast polyurethane coating (S) and injection-molded test specimens (E) according to Ciemniecki and Glasser (1989) (D).