论文部分内容阅读
在3000～5000m/min纺速下制备Fully Crystallinity Yam(FCY)纤维,利用X光衍射、密度梯度等测定了无定形区的含量;并结合声速计算得到无定形区的平均取向。在M-K理论的基础上,重新定义了结构化指数,并计算得到无定形区的微细结构分布。结果表明:在其它工艺条件不变,热板位置、温度、长度分别为544mm、200℃、1800mm时,涤纶FCY的最佳纺丝速度为3 500m/min。即在3 500 m/min纺速形成的无定形结构较均匀、致密。其无定形含量低,无定形取向高,动态力学转变温度高。从tanδ～T曲线可以计算无定形区的分布,在3 500m/min纺速n_(max)、《n》及aum from ≥4 F(n)等较高,峰面积较小,相应的无定形结构较强,无定形含量较低。所得结果与其它方法的结果一致。从tanδ～T曲线可以计算无定形区的分布,且本方法与其它方法相比,更灵敏,更有效,可获得更多的信息。
Fully Crystallinity Yam (FCY) fibers were prepared at spinning speeds of 3000-5000m / min. The amorphous regions were determined by X-ray diffraction and density gradient. The average orientation of the amorphous regions was calculated by combining with the velocity of sound. On the basis of M-K theory, the structural index is redefined and the microstructure distribution of the amorphous region is calculated. The results show that the optimum spinning speed of polyester FCY is 3 500m / min under the condition of other process conditions, the hot plate position, temperature and length are 544mm, 200 ℃ and 1800mm respectively. That is, the amorphous structure formed at spinning speed of 3 500 m / min is more uniform and dense. Its amorphous content is low, high amorphous orientation, high dynamic transition temperature. From the tanδ ~ T curve, the distribution of amorphous zone can be calculated. At 3 500m / min spinning speed n max, “n” and aum from ≥4 F (n) and so on, the peak area is smaller and the corresponding amorphous Strong structure, low amorphous content. The results obtained are consistent with the results of other methods. The distribution of amorphous regions can be calculated from the tanδ ~ T curve, and the method is more sensitive and effective than other methods for more information.