Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub


    Lignin samples fractionated from microwave liquefied switchgrass were applied in the preparation of semirigid polyurethane (PU) foams without purification.The objective of this study was to elucidate the influence of lignin in the PU matrix on themorphological, chemical, mechanical, and thermal properties of thePU foams.The scanning electron microscopy (SEM) images revealed that lignin with 5 and 10% content in the PU foams did not influence the cell shape and size.The foam cell size became larger by increasing the lignin content to 15%. Fourier transform infrared spectroscopy (FTIR) indicated that chemical interactions occurred between the lignin hydroxyl and isocyanate revealing that lignin was well dispersed in the matrix materials. The apparent density of the foam with 10% lignin increased by 14.2% compared to the control, while the foamwith 15% lignin had a decreased apparent density. The effect of lignin content on the mechanical properties was similar to that on apparent density.The lignin containing foams were much more thermally stable than the control foamas evidenced by having higher initial decomposition temperature and maximum decomposition rate temperature from the thermogravimetric analysis (TGA) profiles.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Huang, Xingyan; De Hoop, Cornelis F.; Xie, Jiulong; Hse, Chung-Yun; Qi, Jinqiu; Hu, Tingxing. 2017. Characterization of biobased polyurethane foams employing lignin fractionated from microwave liquefied switchgrass. International Journal of Polymer Science. 2017(1): 1-8.


    Google Scholar

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page