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以最新的CO2/DBU/DMSO溶解体系溶解活化纤维素,以σ -戊内酯为原料合成纤维素接枝聚σ -戊内酯,探索了不同反应时间、反应温度、σ -戊内酯与纤维素脱水葡萄糖单元摩尔比、不同有机碱对纤维素取代度的影响,并利用红外谱图对不同反应条件下产物进行表征,具体分析影响因素.对纤维素接枝聚σ -戊内酯进行核磁、红外、XRD、TGA、DSC、GPC分析,探索结构与性质的关系.“,”In this paper, cellulose has been dissolved successfully in newly developed solvent system superbases/DMSO/CO2, on which the cellulose-grafting-poly (σ -valerolactone) was synthesized through ring-opening polymerization of σ -valerolactone initiated by cellulose and in DMSO without adding extra external catalysts. It was believed that the superbases not only participated in the dissolution of cellulose, but also acted as an organocatalyst in the in situ subsequent ring-opening polymerization of σ -valerolactone initiated by cellulose. The effects of the structure of superbases, the mole ratio of σ -valerolactone to cellulose, the reaction time and temperature on the grafting efficiency were studied. The structure and thermochemical properties of the as-prepared cellulose-graft-poly(σ -valerolactone) was characterized by NMR, FT-IR, XRD, TGA, DSC and GPC. The results demonstrated that DBU and TBD presented the best performance among the superbases applied.