超高分子量聚乙烯纤维牵伸温度研究

Study on the Temperature of Ultrahigh Molecular Weight Polyethylene in the Drawing Process

超高分子量聚乙烯纤维只有经过多级牵伸,才能成为高强度、高模量的高性能纤维。在牵伸工艺中涉及到牵伸温度及牵伸倍率两个工艺参数。本文从牵伸温度角度出发,采用多级牵伸得到了高性能聚乙烯纤维,利用强伸仪、DSC等表征手段,系统地研究了各级牵伸温度对超高分子量聚乙烯纤维性能影响规律,探索最佳牵伸温度组合。本项研究表明,牵伸温度直接影响最大牵伸倍率,最终影响到纤维的力学性能,采用三级牵伸可以使纤维力学性能达到较高水平,最佳温度组合为137.5℃—147.3℃—147.3℃,纤维强度32cN.dtex-1。

Ultrahigh molecular weight polyethylene would become high performance fibers with high strength and high modulus by ultra-drawing. The temperature and draw ratio are significant spinning parameters. In this article, the effect of drawing temperature on the properties of UHMWPE fibers and the most appropriate temperature were systematically studied on with the help of tensile testing and DSC analysis. The results showed that the drawing temperature impacted on the maximum draw ratio, and ultimately affected the mechanical properties of fibers. In addition, the three draft allowed the mechanical properties of fibers to achieve a higher level, and the strength of the fiber .was 32 cN·dtex-1 when the best temperature combination was 137.5℃--147.3℃--147.3℃.