利用纤维素工业废丝/胶高效制备再生纤维素纳米晶

Efficient preparation of regenerated cellulose nanocrystals with industrial cellulose scrap filament/gel

为解决再生纤维素工业丝的废丝以及生产过程中的废丝/胶的再利用问题,设计了以再生纤维素工业废丝或废丝/胶为原料高效制备再生纤维素纳米晶(RCNC)的方法,并通过傅里叶变换红外光谱、马尔文激光粒度仪、扫描电子显微镜、X射线衍射和原子力显微镜等方法,对比了利用新溶剂法再生纤维素工业废丝/胶、粘胶再生纤维素工业废丝和浆粕制得的RCNC、CNC的结构性能上的区别。结果表明:新溶剂法再生纤维素工业丝废丝/胶高取向度、高结晶度和结构简单的特性使其可以在更温和的条件下酸解,制备的RCNC得率高达到65.09%,远大于以浆粕为原料制备CNC的得率,且具有更高的结晶度。与粘胶纤维素工业废丝制得的RCNC相比,两者具有相似的尺寸与形貌,都为纳米级的棒状结构,长度和长径比分别为93 nm±26 nm和35±20,表明此方法对于不同来源的纤维素工业丝废丝具有一定的普适性。

In order to solve the reutilization problems of waste filament of regenerated cellulose industrial filament and waste filament/gel during production,a method for efficient preparation of regenerated cellulose nanocrystal(RCNC)using industrial waste filament of regenerated cellulose industrial filament or waste filament/gel as raw materials was designed.The structural performances of new solvent method,industrial waste filament of viscose regeneration cellulose,RCNC prepared with pulp and CNC were compared by Fourier transform infrared spectroscopy,Malvern laser particle size analyzer,scanning electron microscopy,X-ray diffraction,atomic force microscopy and so on.The results demonstrated that regeneration cellulose industrial waste filament/gel with new solvent method could be acid-hydrolyzed under milder conditions due to its characteristics as high orientation,high crystallinity and simple structure.The yield of RCNC obtained reached 65.09%,which was significantly higher than the yield of CNC prepared from pulp,and exhibited higher crystallinity.Compared with RCNC obtained from viscose industrial waste filament,both had similar size and morphology presenting a nanoscale rod-like structure with lengths and aspect ratios of 93 nm±26 nm and 35±20,respectively.This indicated that the method had a certain universality for industrial cellulose waste filaments from different sources.