【摘要】 测定了纤维素在不同结构的离子液体——1-烯丙基-3-甲基咪唑氯化物([AMIM]Cl)和1-丁基-3-甲基咪唑氯化物([BMIM]Cl)中的溶解度和溶解速率。结果发现:相同条件下,纤维素在[AMIM]Cl中具有较大的溶解度和较快的溶解速率;随着纤维素聚合度的增大,相同条件下,纤维素在离子液体中的溶解度降低。进一步通过WXRD、FT-IR、13C NMR和黏度法分析了溶解前后纤维素的化学结构、结晶结构和聚合度,结果表明:纤维素在离子液体中的溶解属于直接溶解,纤维素经离子液体溶解和再生后,晶型由纤维素I转变为纤维素II;溶解时间和温度对再生纤维素的聚合度有较大的影响,随着溶解时间的延长和溶解温度的提高,再生纤维素聚合度降低。更多还原

【Abstract】 The solubility and the dissolution rate of cellulose in two ionic liquids with different structure AMIMCl and BMIMCl were investigated. The results showed that it had higher solubility and faster dissolution rate of cellulose in AMIMCl than in BMIMCl. The solubility of cellulose in ionic liquids decreased with the increase of degree of polymerization (DP). The crystalline structure, chemical structure and DP were characterized using X-ray diffraction, FT-IR spectroscopy, 13C NMR spectroscopy and viscosity method. It was shown that ionic liquids were direct solvents for cellulose. The crystalline form of cellulose transformed from cellulose I to cellulose II after regeneration from ionic liquids. The DP of cellulose decreased with the increase of dissolution time and dissolution temperature.更多还原