Modification of the mechanical properties of polyamide 6 multifilaments in high-speed melt spinning with nano silicates
Modification of the mechanical properties of polyamide 6 multifilaments in high-speed melt spinning with nano silicates
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DOI：
10.1177/0040517512456756
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发表时间：
2012-09
影响因子：
2.3
通讯作者：
W. Steinmann;S. Walter;T. Gries;G. Seide;G. Roth
中科院分区：
文献类型：
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作者：
W. Steinmann;S. Walter;T. Gries;G. Seide;G. Roth
在过去的几年里，研究活动一直集中在用纳米级添加剂改性纤维性能上。最重要的研究领域之一是力学性能的改变，如韧性和比断裂载荷。在这项研究中，我们确定了纳米层状硅酸盐对聚酰胺6复丝纱线的拉伸性能的影响。首先证明了纤维的拉伸性在工业相关的高速熔融纺丝工艺中急剧增加。通过广角X射线衍射（WAXD）和差示扫描量热法（DSC）对材料的结构进行了表征。的结晶性能的变化，以及在硅酸盐的排列与纤维的应力-应变曲线进行比较，并从这些实验中得出的拉伸过程的分子机制。在第一步骤中，对于低拉伸比（DR），发生不受硅酸盐影响的晶体结构中的显著相变。超过这一点，未改性的纤维开始断裂，硅酸盐层之间发生滑动，这是纤维拉伸性能延长的原因。这一机制为纤维加工提供了新的可能性，可用于未来超细纤维的研究。
In the last few years research activities have been focused on the modification of fiber properties with nano-scaled additives. One of the most important fields of research is the alteration of mechanical properties such as the tenacity and the specific breaking load. In this study, we determined the influence of nano-phyllosilicates on the drawability of polyamide 6 multifilament yarns. It was first demonstrated that the drawability of the fibers drastically increased in an industrially relevant high-speed melt spinning process. Structural properties of the material are identified by wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). Changes in the crystalline properties as well as in the alignment of the silicates are compared with the stress–strain curves of the fibers, and a molecular mechanism for the drawing process is derived from these experiments. In a first step, a significant phase transition in the crystalline structure unaffected by the silicates occurs for low draw ratios (DRs). Beyond this point, where unmodified fibers start to break, a gliding between the silicate layers takes place, which is responsible for an extended drawability of the fibers. This mechanism leads to new possibilities for fiber processing, which can be used to research ultra-fine filaments in future studies.