Formation of a large‐scale shish‐kebab structure of polyoxymethylene in the melt spinning and the crystalline morphology evolution after hot stretching |
| |
| Authors: | Lin Li Tao Zhou Jianzhong Liu Qianping Ran Guangdou Ye Jihai Zhang Pengqing Liu Aiming Zhang Zhiqian Yang Degen Xu Jiaping Liu |
| |
| Institution: | 1. State Key Laboratory of High Performance Civil Engineering, Nanjing, China;2. State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute, Sichuan University, Chengdu, China |
| |
| Abstract: | Polyoxymethylene (POM) fiber was produced by melt spinning with a high take‐up speed, which imposed a strong flow field. An unexpected formation of a shish‐kebab morphology with multiple shish of POM fibers was reported for the first time. This morphology is a large‐scale shish kebab with a diameter of 10.5 µm. Further orientation of the POM fiber was obtained by hot stretching twice at 160°C. Two crystalline morphology evolution processes were also observed: (i) the process from the large‐scale shish‐kebab to the deformed small shish‐kebab and (ii) the process from the deformed small shish‐kebab to the perfect whiskers. Compared with the melt spinning fiber, fiber tensile strength with first and second hot stretching increased by 976% and 1705%, respectively. The crystalline melting behavior of fibers significantly changes after the first and second hot stretching. The flow field induces a large number of extended chain crystals. Copyright © 2014 John Wiley & Sons, Ltd. |
| |
| Keywords: | polyoxymethylene shish kebab morphology evolution melt spinning |
|
|
