离子液体[Bmim]Cl工艺竹纤维素包装膜制备

Preparation and properties of bamboo cellulose packaging film by ionic liquid [Bmim] Cl process

为研究温度和竹粉粒径对竹纤维素溶解率影响,以竹粉为原料,离子液体[Bmim]Cl为溶剂,甘油为增塑剂,制备竹纤维素包装膜,利用X射线衍射、傅里叶红外光谱和热重分析等表征手段研究竹纤维素在[Bmim]Cl中溶解前后的变化。研究结果发现:竹粉粒径越大,竹粉的溶解率越小,当[Bmim]Cl溶解处理竹粉5.0 h后,60目和200目粒径竹粉的溶解率分别为12.3%和21.8%。竹纤维素在离子液体[Bmim]Cl溶解过程属于物理过程,X射线衍射表明晶型完成由纤维素Ⅰ向纤维素Ⅱ的转变;热重分析表明竹纤维素再生前后具有良好的热稳定性。竹纤维浓度由5%增加到20%,薄膜的拉伸强度从7 MPa提高到14 MPa,断裂伸长率从2%提高到7.6%。研究结果为竹纤维素在包装领域开发和利用提供理论支持。

In order to study the effect of temperature and bamboo powder particle size on the dissolution rate of bamboo cellulose,bamboo cellulose packaging film was prepared with bamboo powder as raw material,ionic liquid [Bmim]Cl as solvent and glycerol as plasticizer.X-ray diffraction,Fourier transform infrared spectroscopy and thermogravimetric analysis were used to study the changes of bamboo cellulose before and after dissolution in [bmim]Cl.The results show that the larger the particle size of bamboo powder,the smaller the dissolution rate of bamboo powder.When bamboo powder was dissolved by [bmim]Cl for 5.0 h,the dissolution rates of 60 mesh and 200 mesh bamboo powder were 12.3% and 21.8% respectively.The dissolution process of bamboo cellulose in ionic liquid [bmim]Cl belongs to physical process.X-ray diffraction shows that the crystal form has completed the transformation from cellulose I to cellulose II;Thermogravimetric analysis shows that bamboo cellulose has good thermal stability before and after regeneration.The concentration of bamboo cellulose increases from 5% to 20%,the tensile strength of the film increases from 7 MPa to 14 MPa,and the elongation at break increases from 2% to 7.6%.The research results provide theoretical support for the development and utilization of bamboo cellulose in the field of packaging.