Formaldehyde Free Renewable Thermosetting Foam Based on Biomass Tannin with a Lignin Additive  

作　　者：Bowen Liu Yunxia Zhou Hisham Essawy Shang Feng Xuehui Li Jingjing Liao Xiaojian Zhou Jun Zhang Sida Xie 

机构地区：[1]Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products,Southwest Forestry University,Kunming,650224,China [2]Department of Polymers and Pigments,National Research Centre,Cairo,12622,Egypt [3]Key Laboratory for Forest Resources Conservation and Utilisation in the Southwest Mountains of China(Southwest Forestry University),Ministry of Education,Kunming,650224,China

出　　处：《Journal of Renewable Materials》2022年第11期3009-3024,共16页可再生材料杂志（英文）

基　　金：The Natural Science Foundation of China(Grant No.31800482);the Yunnan Provincial Natural Science Foundation(Grant Nos.202101AT070038,2018FG001095 and 2018FD042);the Yunnan Provincial Youth Top Talent Project and Youth Talent Support Project and Middle-Age Reserve Talents of Academic and Technical Leaders(2019HB026);the 111 Project(D21027).

摘　　要：This study presents easily prepared free formaldehyde bio-based foam based on a prepared thermosetting resin comprising tannin–lignin–furfuryl alcohol-glyoxal(TLFG)via mechanical stirring in presence of ether as a foaming agent.The foam was developed through a co-polycondensation reaction of glyoxal and furfuryl alcohol with condensed tannin and lignin,which is a forest-derived product.Investigation using scanning electron microscopy(SEM)showed more closed-cell structure without cracks and collapse in the TLFG foam,with a higher apparent density with respect to tannin–furanic–formaldehyde(TFF)foam.Differential scanning calorimetry(DSC),dynamic thermomechanical analysis(DTMA),and thermogravimetric analysis(TGA)investigations revealed that the curing process of TLFG foam proceeds easily even at a lower temperature.Additionally,it acquired higher heat resistance than TFF foam.Moreover,TLFG has a more robust chemical network structure,which contributes efficiently to the mechanical strength and a lower pulverization degree compared with TFF-derived foam.Fourier transform infrared spectrometry(FTIR)and electrospray ionization mass spectrometry(ESI-MS)proved that the cross-inking reactions between tannin,lignin,furfuryl alcohol,and glyoxal have been proceeded efficiently.

关 键 词：Foam materials heat resistance TANNIN LIGNIN GLYOXAL compressive strength 

分 类 号：O64[理学—物理化学]