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Polyurethane materials are generally prepared by the reaction of isocyanates and polyols obtained mainly from petroleum resources. However, with increasing concern about the protection of the environment and the shortage of petroleum resources, the synthesis of bio-base polyurethane materials from renewable biomass resources has recently attracted a lot of attention. Lignin is an abundant renewable agricultural biomass resource, which is defined as a random, amorphous, three- dimensional polymeric network. Hydroxyl groups and free positions in the aromatic ring are the most characteristic functions in lignin, and they determine the reactivity and constitute the reactive sites in lignin’s chemical reaction.

As a result, considerable efforts have been directed toward the development of bio-base polymer materials by the reaction on these groups, with attempts to find new alternatives to petroleum resources. This book reviews the study of bio-base polyurethane foaming materials derived from agricultural biomass polyol, including: liquefaction of agricultural biomass and the characterization of bio-base polyol, polymerization between bio-base polyol and isocyanate, the cross-link density, morphology, compressive strength, thermal stability, burning behavior, thermal conductivity and application of agricultural bio-base polyurethane foaming materials. (Imprint: Nova)