改性甘蔗渣微晶纤维素特性及其对明胶膜性能的影响

Preparation and properties of modified bagasse microcrystalline cellulose/gelatin membrane

该研究以甘蔗渣微晶纤维素为原料,制备了醚化微晶纤维素和乙酰化微晶纤维素,利用扫描电镜、X-射线衍射、傅里叶变换红外光谱及差示扫描量热分析了2种改性甘蔗渣微晶纤维素性质。同时以明胶为成膜基质,研究了2种改性甘蔗渣微晶纤维素对复合膜性能的影响,结合上述方法分析复合膜的结构及热稳定性。结果表明,甘蔗渣微晶纤维素改性后,形貌未发生明显变化,改性基团成功被接入,结晶度、熔融温度均有降低。明胶与甘蔗渣微晶纤维素、醚化微晶纤维素、乙酰化微晶纤维素的复合膜透水透气性及机械性能均低于明胶膜,乙酰化微晶纤维素的相关性能最好,3种微晶纤维素均与明胶有良好的相容性,结构致密,稳定性增强。

In this paper,etherified microcrystalline cellulose and acetylated microcrystalline cellulose were prepared from bagasse microcrystalline cellulose.The properties of two kinds of modified bagasse microcrystalline cellulose were analyzed by scanning electron microscopy,X-ray diffraction,Fourier transform infrared spectroscopy,and differential scanning calorimetry.At the same time,the effects of two kinds of modified bagasse microcrystalline cellulose on the properties of the composite membrane were studied.The structure and thermal stability of the composite membrane were analyzed by scanning electron microscopy,X-ray diffraction,Fourier transform infrared spectroscopy,and differential scanning calorimetry.Results showed that after bagasse microcrystalline cellulose modification,the morphology did not change significantly,the modified groups were successfully incorporated,and the crystallinity and melting temperature decreased.The water permeability and mechanical properties of the composite membranes of gelatin,bagasse microcrystalline cellulose,etherified microcrystalline cellulose,and acetylated microcrystalline cellulose were lower than those of gelatin films.Acetylated microcrystalline cellulose had the best performance.The three microcrystalline celluloses had good compatibility with gelatin,compact structure,and enhanced stability.