Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Physics Department, Faculty of Science, Umm Al-Qura University, Makkah, Saudi Arabia.
Microsc Res Tech. 2019 Nov;82(11):1922-1927. doi: 10.1002/jemt.23360. Epub 2019 Aug 13.
The development of crystallinity and orientation during the melt spinning of polyamides (nylon 66) was investigated. This study reports the question of the orientation and crystallinity determination of nylon 66 by means of differential scanning calorimetry, optical polarized microscope, and X-ray diffraction techniques during the cold drawing process. The different structural properties such as crystallinity, crystal size, birefringence, and different orientation functions were measured as a function of the draw ratio. From the obtained thermogram, it is clear that the melting temperature of the drawn nylon 66 fibers did not show a significant change due to the cold drawing process. As the draw ratio increase, the crystallinity and crystal size increase. The drawing process improves the chain orientations along the fiber axis of nylon 66 fibers. The orientations of the chain segments enhanced due to the cold drawing process of nylon 66 fibers.
研究了聚酰胺（尼龙 66）在熔融纺丝过程中的结晶度和取向的发展。本研究通过差示扫描量热法、偏光显微镜和 X 射线衍射技术，报告了在冷拉伸过程中通过尼龙 66 的取向和结晶度测定的问题。不同的结构性能，如结晶度、晶体尺寸、双折射和不同的取向函数，作为拉伸比的函数进行了测量。从获得的热谱图可以清楚地看出，由于冷拉伸过程，拉伸尼龙 66 纤维的熔点没有明显变化。随着拉伸比的增加，结晶度和晶体尺寸增加。拉伸过程提高了尼龙 66 纤维沿纤维轴的链取向。由于尼龙 66 纤维的冷拉伸过程，链段的取向得到增强。
