Characterization and analysis of toughened bio-oil-basedphenolic foam prepared from poplar

摘要

Different catalysts (NaOH, H2O2, and NaOH/H2O2) was used to catalyze the conversion of poplar to bio-oil, which was then used to synthesize bio-oil-based phenolic foam (BPM). The bio-oil and BPM were characterized with GC-MS, FT-IR, TGA, optical microscope, extreme oxygen index analyzer, and universal testing machine. The results showed that the BPM had the better flame retardancy. The maximum limiting oxygen index was 37.7 found on the BPM prepared from NaOH/H2O2-catalyzed bio-oil. Compared with NaOH or H2O2, the NaOH/H2O2 presented synergistic catalysis in producing bio-oil with the highest phenolic content. The BPM synthesized with the bio-oil substitution at 20 showed the maximum compressive strength of 0.27 MPa. After the microscopic observation and TGA, it was found that BPM prepared from NaOH/H2O2 catalyzed bio-oil had more uniform and tiny bubbles, and higher thermal stability. In addition, a reasonable reaction mechanism was provided to explain the role of bio-oil in BPM synthesis.