Preparation of Semirigid igid Polyurethane Foam (PUF) with Liquefied Bamboo residues
Bamboo residues is an abundant and renewable lignocellulosic biomass, and as one of the byproducts of fast growing biodiesel industry in China, crude glycerol is surplus for the traditional chemical industries. In present investigation, bamboo residues was liquefied by using a solvent mixture consisting of polyethylene glycol 400 and crude glycerol(4/l,w/w) at 160℃ for 180 min and sulfuric acid 4％. The liquefied bamboo(LB) had a hydroxyl number from 178.36 mgKOH/g to 200.51 mgKOH/g and viscosities from 507mPaS to 2201 mPa-S. Polyurethane (PU) foams were prepared from liquefied bamboo residues with variable amount of polyaryl polymethylene isocyanate (PAPI), with water as blowing agent, silicone as surfactant and triethylenediamine and dibutyltine dilaurate as co-catalyst. The mechanical properties of LB-PU foams with different NCO/OH ratio were studied on a universal tensile tester. With the increase of NCO/OH ratio from 0.4 to 1.4, compressive strength LB-PU foams first raised, reached their maximum values at NCO/OH ratio of 1.0, and then declined; with the increase of wood content at a NCO/OH ratio of 1.0, both Compressive strength and Densities decreased; FT-IR studied the chemical structure of LB-PU foams, and variation of cell structure of LB-PU foams was studied by SEM. Thermal decomposition behaviour of LB-PU foams was studied by TG/DTA.
bamboo residues liquefaction LB-PU foams physical properties FT-IR thermal properties
Long-Lan Gao Yu-Huan Liu Hong Peng Roger Ruan
Key Laboratory of Food Science of MOE,Nanchang University,Nanchang 330047,China;Engineering Research Engineering Research Center for Biomass Conversion,MOE,Nanchang 330047,China
国际会议
广州
英文
1450-1455
2008-12-03（万方平台首次上网日期，不代表论文的发表时间）