摘要
采用氯化锌/乙酰胺低共熔离子液（DES）处理2种木质素,加水作为反相溶剂得到再生木质素.研究用其替代部分苯酚制备木质素改性酚醛树脂（LPF）的基本性能变化,结合热重分析法（TGA）分析树脂的热解特性,引入Flynn-Wall-Ozawa模型量化了树脂的表观活化能.结果表明,经该DES处理前后的磨木木质素和酶解木质素均可在保持树脂基本性能稳定的前提下替代20％苯酚制备LPF.升温速率β影响树脂的热分解过程,4种LPF的初始分解温度、热解过程所需的活化能均高于未改性酚醛树脂（PF）,特别是经氯化锌/乙酰胺DES处理后的再生磨木木质素改性酚醛树脂（RMLPF）,其热降解温度更高,残炭率更多,热解过程所需的活化能比PF高出2～4倍,热稳定性明显提高.
Deep eutectics solvent （ DES ） with zinc chloride and acetamide was used to modify two kinds of lignin, the regenerated lignin （ RL ） was obtained by adding water as a reversed-phase solvent. The properties of lignin- phenol-formaldehyde resin （LPF） with lignin and RL substituted partial phenol were studied. Thermogravimetric analysis （ TGA ） was applied to investigate the pyrolysis process of LPF and the corresponding apparent activation energy （ AAE ） values were calculated with the Flynn-Wall-Ozawa model. The results showed that 20 % of phenol was replaced by milled wood lignin （ ML ） , corncob lignin （ CL ） , regenerated ML （ RML ） and regenerated CL （ RCL ） , respectively, the properties of 4 resins were similar with PF. The heating rate （ β ） affected the thermal decomposition of resins, the initial decomposition temperature and AAE values of pyrolysis process for four kinds of LPF resins were higher than PF, particularly for RMLPF, got the higher thermal degradation temperature and the more residues, and also the AAE values was 2-4 times higher than PF, indicating that its thermal stability was obviously improved.
出处
《林产工业》
北大核心
2016年第5期19-24,共6页
China Forest Products Industry
基金
国家自然科学基金资助项目(31370567)
江苏省自然科学基金资助项目(BK20131427)
江苏高校优势学科建设工程资助项目(PAPD)
关键词
低共熔离子液
木质素
酚醛树脂
热重分析
表观活化能
Deep eutectic solvent
Lignin
Phenol-formaldehyde resin
Thermogravimetric analysis
Apparent activation energy
