采用X射线衍射技术对梁山慈竹微纤丝角(MFA)的变异特性进行了研究, 并就微纤丝角对拉伸力学的影响进行了分析。 结果表明, 梁山慈竹微纤丝角随竹龄增加的变化较小, 三年生竹的微纤丝角最大, 为8.521°, 二、 三年生竹微纤丝角的平均值明显大于四、 五年生竹, 差异绝对值小于0.1°。 竹秆基部、 中部和上部微纤丝角的平均值分别为8.499°, 8.497°和8.483°, 变异系数在5%左右。 微纤丝角从竹青到竹黄呈增大的趋势。 方差分析表明, 径向部位对微纤丝角有显著性影响, 竹龄和纵向部位对微纤丝角无显著影响。 顺纹拉伸强度和杨氏模量呈线性相关(r=0.57)。 微纤丝角对力学性能有一定影响, 拉伸强度和杨氏模量中分别有35%和43%的变异由微纤丝角引起。

X-ray diffraction technology was used to rapidly predict variation in microfibril angle (MFA) in Dendrocalamus farinosus. The results show that there is little variation in MFA with bamboo age from 2a to 5a, and MFA of 3a is at the maximum with the value of 8.521°. The average value of MFA of 2a or 3a is greater than 4a or 5a with absolute differences less than 0.1°. MFA of base, middle and upper position respectively are 8.499°, 8.497° and 8.483° with coefficient of variation about 5%. There is an increasing tendency from the periphery to the inner of bamboo culms. Variance analysis indicates that MFA is highly sensitive to radial position, but insensitive to bamboo age and longitudinal position. The correlation coefficient of longitudinal strength and modulus of elasticity (MOE) is 0.57. MFA was responsible for 35% and 43% of the variation found in longitudinal strength and MOE respectively, which means MFA has a certain extent effect on mechanical properties.