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International Journal of Polymer Science
Volume 2019, Article ID 3710545, 6 pages
https://doi.org/10.1155/2019/3710545
Research Article

Preparation and Characterization of Rigid Polyurethane Foams with Different Loadings of Lignin-Derived Polycarboxylic Acids

College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, China

Correspondence should be addressed to Yanchao Zhu; nc.ude.ulj@uhz_oahcnay

Received 14 December 2018; Revised 1 April 2019; Accepted 15 April 2019; Published 19 May 2019

Academic Editor: Domenico Acierno

Copyright © 2019 Ruiqi Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Lignin was modified by oxidation to prepare lignin-derived polycarboxylic acids (LPCAs). LPCAs can be introduced into rigid polyurethane foams (RPUFs) via 1,4-dioxane. The expansion ratio and compressive strength of RPUFs were observed. When the loading of LPCAs was 0.67 wt% (based on polyol), the compressive strength of RPUF was the highest and was about 59.2% higher than that of the blank RPUF. The reinforcing mechanism of LPCAs was supposed that the interactions between LPCAs and RPUFs increased the strength of the cell walls. When the loading of LPCAs was less than 0.33 wt%, the expansion ratio of RPUFs increased slightly. The water resistance of RPUFs was not affected by LPCAs, suggesting that RPUFs with LPCAs could be used in a humid environment. Besides, the application of the oxidative modification products of lignin was broadened.