纖維素為地球上儲存豐富的高分子資源，可迅速再生。本研究利用天然棉漿當材料，以硫酸酸降解棉漿製備奈米纖維素，並混合奈米絹雲母研製聚乳酸奈米複合材料，以提昇其附加價值。本研究製備之奈米複合材，進行原子力顯微鏡、熱重分析儀與靜態接觸角測量儀等儀器檢測，分析奈米複合材的表面性質。本實驗使用之硫酸水解棉漿實驗條件為：硫酸濃度60% 、固液比1:20 、溫度45℃ 、反應時間5 min 條件下製得奈米纖維素，得率為54.43% ，經雷射粒徑分析儀分析實驗結果顯示，可得產物粒徑為58.77-458.7 nm，平均尺度為318.99 nm。靜態接觸角測量儀分析結果指出聚乳酸為疏水性材料，添加奈米纖維素與奈米絹雲母，可降低表面疏水性。原子力顯微鏡分析結果顯示，表面粗糙度大幅下降約84.78% ；場發式掃描電子顯微鏡觀測結果顯示，奈米纖維素與奈米絹雲母的添加量僅需5% ，便可顯著提升複合材表面的平滑程度。熱重力分析結果顯示，添加5% 奈米纖維素與奈米絹雲母可增加約30℃ 熱裂解溫度。

Cellulose is the most abundantly generated natural polymer resources, which is capable of rapid renewal. In this study, cotton pulp was hydrolyzed by sulfuric acid in order to produce nanocrystalline
cellulose (NCC). Then this library produced NCC was incorporated in polylactic acid (PLA) with nano-sericite (NS) to produce nano-composite and to enhance value-addition to original materials. All the nano-composites prepared in this study were characterized using atomic force microscopy (AFM),TGA, and static contact angle analyzer to determine its surface properties.The optimal condition for hydrolyzing cotton with sulfuric acid entailed a sulfuric acid concentration 60%, solid-to-liquor ratio 1: 20, temperature 45℃, and reaction time 5 min. The maximum yield of NCC is 54.4%. Laser particle sizer analyzes shows that NCC had particle diameters of 58.8~458.7 nm, and an average diameter of 319.0 nm. Static contact angle analysis results suggested that PLA was hydrophobic, whereas adding NCC and NS increased the hygroscopicity of the composite
surface. AFM analysis suggested that the surface roughness reduced 84.78%. According to FE-SEM results, adding only 5% NCC and 5% NS can highly increase the surface smoothness of composite. On the other hand, TGA analysis indicated that adding 5% nanocrystalline celluloses and 5% nanosericite raised pyrolysis temperature of the composite by ca. 30℃.