文献类型：期刊文献

英文题名：Effect of incorporation of lignin as bio-polyol on the performance of rigid lightweight wood-polyurethane composite foams

作者：Luo, Shupin[1,2] Gao, Li[1,2] Guo, Wenjing[1,2]

第一作者：罗书品

通信作者：Gao, L[1];Gao, L[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry New Technol, 1 Dongxiaofu, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, 1 Dongxiaofu, Beijing 100091, Peoples R China

年份：2020

卷号：66

期号：1

外文期刊名：JOURNAL OF WOOD SCIENCE

收录：;EI(收录号：20201508398607);Scopus(收录号：2-s2.0-85082869720);WOS:【SCI-EXPANDED(收录号:WOS:000523014800001)】；

基金：This work was financially supported by the National Key Research and Development Program of China "Manufacturing technology of lightweight woodbased material" (2018YFD0600301) and the Special Fund of Chinese Academy of Forestry for Fundamental Scientific Research (CAFYBB2017ZX003-3).

语种：英文

外文关键词：Wood; Lignin; Polyurethane; Lightweight composite; Compressive properties

摘要：Density reduction has become a topical issue in wood composite materials for application in building and furniture. In this study, lightweight wood-polyurethane (W-PU) composite foams with the addition of 30 wt% wood particles were prepared. Industrial kraft lignin was used as bio-polyol to substitute partial petroleum-based diethylene glycol (DEG) to synthesize rigid W-PU foams. The effect of varying lignin contents (5, 10, 15 and 20 wt% based on DEG mass) on the reactivity, morphology, density, compressive properties, water absorption and thermal stability of the foams was evaluated. Fourier transform infrared (FTIR) analysis confirmed the formation of characteristic urethane linkages in all the foam samples. With the incorporation of lignin, the foam cellular shape became irregular with formation of large cells. W-PU foams exhibited poor cellular structures with a larger number of open cells. The density of W-PU foams increased from 47 to 96 kg/m(3) as the lignin content increased from 0 to 20%. Although the foam reactivity was decreased by the incorporation of lignin, both the compressive strength and modulus were increased upon the incorporation of lignin. Furthermore, the specific compressive strength and modulus of W-PU foams increased by 55% and 48% with lignin content increasing from 0 to 20%, and the 20-day water absorption decreased by 38%. Thermal gravimetric analysis showed that the incorporation of lignin did not significantly affect the thermal degradation behaviour of foam, but it rather increased the mass of char residue. This study provides a promising method for value-added utilization of technical lignin in W-PU lightweight composites.