将荧光分子导入棉纤维细胞壁的非晶区,用偏振荧光分光光度计测量其荧光强度偏振分量的角分布,据此求出细胞壁非晶区物质的取向度.结果表明:非晶区物质中的分子取向不是随意的.用偏振荧光法测定陆地棉纤维中非晶区物质的取向度f为0.2左右.在荧光剂浓度为0.01％条件下,浸渍时间至少需要48h. The fluorescence molecules were introduced into the amorphous region of the cotton fiber cell wall, and the angular distribution of the polarization components of the fluorescence intensity was measured by polarization fluorescence spectrophotometer to obtain the orientation degree of the amorphous material in the cell wall. The results showed that The molecular orientation is not arbitrary.Using polarization fluorescence method to determine the orientational degree f of amorphous material in Upland cotton fiber is about 0.2.Under the conditions of 0.01% phosphor concentration, the immersion time need at least 48h.