木质素含量对纤维素纳米纤维热稳定性的影响

Effect of Lignin Content on the Thermal Stability of Cellulose Nanofiber

关键词:  纤维素纳米纤维  预处理  木质素  热稳定性

Key Words:cellulose nanofiber  pretreatment  lignin  thermal stability

摘要:分别采用热水、绿液及漂白预处理以改变蔗渣和云杉纤维素纳米纤维的木质素含量，探究残余木质素含量对纤维素纳米纤维热稳定性能的影响。结果表明，经过热水预处理制备的蔗渣和云杉纤维素纳米纤维的木质素含量分别比经过绿液预处理制备的蔗渣和云杉纤维素纳米纤维高16.1%和8.9%，比经过漂白预处理制备的蔗渣和云杉纤维素纳米纤维的高22.7%和24.3%，半纤维素含量相对较低。经过热水预处理制备的蔗渣和云杉纤维素纳米纤维的热稳定性分别比经过漂白预处理制备的蔗渣和云杉纤维素纳米纤维的热稳定性提高了约4.3%和5.4%。

Abstract:The hot water， green liquor and bleach pretreatment were used to change the lignin content of bagasse and spruce cellulose nanofibers and explore the effect of residue lignin content on the thermal stability of cellulose nanofibers. The results indicated that the lignin content of SCB-HW and SP-HW was 16.1% and 8.9% higher than SCB-GL and SP-GL， 22.7% and 24.3% higher than SCB-B and SP-B， while hemicellulose the content was relatively low. The thermal stability of SCB-HW and SP-HW was 4.3% and 5.4% higher than that of SCB-B and SP-B， respectively. Conclusively， the different pretreatment changed the lignin and hemicellulose content of cellulose nanofibers and impacted the thermal stability of cellulose nanofibers.