Preparation of lignin-based silica composite nanoparticles and its application in HDPE
According to the presence situation that lignin-based SiO2composite nanoparticles are difficult for industry application, owing to serious aggregation and low lignin capacity, phosphatized alkali lignin (PAL) was prepared through phosphorylation reaction using alkali lignin (AL) from the alkaline pulping spent liquor of poplar as main material. The lignin/silica composite nanoparticles (L-SiO2) was combined from 1 part nanosilica with 1.2 part (by mass) synthesized PAL by acidulation co-precipitation method. Subsequently, L-SiO2 was added into HDPE to prepare L-SiO2/HDPE composites. Results of FT-IR, XPS, TEM, TG and static contact angle showed that PAL was bonded to silica through hydrogen bonds. L-SiO2 accounted for 47% (mass) LQA. Compared to crude silica, the particle size of L-SiO2 increased from 25 to 40 nm and the agglomeration of particle decreased noticeably. More importantly, the surface of L-SiO2 became more hydrophobic, which made them disperse better in HDPE. The tensile strength and elongation at break of prepared L-SiO2/HDPE composites were 48.68% and 73.57%, respectively, higher than those of AL/HDPE.
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NSTL
万方数据
维普
