<正>可生物分解的纳米复合材料是新一代材料，微米和纳米级纤维素纤丝具有环保性和潜在的低密度及高强度，可用来制造能生物分解的纳米复合材料。为了描述用一种新的机械方法从Lyocell纤维中分离出的纤丝的特性，以及探索这种纤丝能否增强生物分解的聚合物，笔者用偏振光显微镜（PLM）和扫描电子显微镜（SEM）研究了纤丝的几何特性，用宽角X光衍射法（WAXD）分析了其结晶度，纤维的纤丝化程度用水分保持值（WRV）进行了评价；纤丝增强的聚乳酸（PLA）纳米生物复合材料由模压法制备，用拉伸试验来检测其力学强度，采用SEM来观察其断面特性。结果表明：纤丝提高了PLA的弹性模量和拉伸强度，但纤丝和聚合物基质之间的结合强度很弱。

The enzymology characteristics of immoobilized and free 13-glucosidase were investigated. The optimal pH of immobilized and free 13-glucosidase was 4.5. The optimal temperature of immobihzed β-glucosidase was 60 C, which was 5 C lower than that of free 13 glucosi dase. hs stabilities of pH and storing were obviously higher than that of free β-glucosidasc, but its thermal stability was a little lower than that of free 13-glucosidase. The apparent Km and Km of immobilized and free 13-glucosidase were 0.52 mmol/L and 2.4 mmol/L, respec tively. The immobilized 13 glucosidase was used to hydrolyze 10g/L cellobiose solmion re peatedly, its half life time was about 31days.