Evolution of the morphology and the mechanical properties of ternary PE/PA6/GF composites during annealing
Evolution of the morphology and the mechanical properties of ternary PE/PA6/GF composites during annealing
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DOI：
10.1016/j.polymer.2007.08.037
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发表时间：
2007-10
期刊：
影响因子：
4.6
通讯作者：
P. Malchev;G. D. Vos;B. Norder;S. Picken;A. Gotsis
中科院分区：
文献类型：
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作者：
P. Malchev;G. D. Vos;B. Norder;S. Picken;A. Gotsis
采用双螺杆挤出机同时熔融挤出聚乙烯（PE）、聚酰胺-6 （PA6）和短玻璃纤维制备三元复合材料。如果纤维与PA6兼容，则在加工过程中在基体（PE）内建立由次要PA6相域焊接的纤维网络。虽然添加了少量的PA6，但纤维的存在促进了该相的连续性。因此，三元混合物类似于共连续二元混合物的形态。本文研究了三元复合材料在PA6熔点以上退火后的稳定性。观察到动态拉伸模量的增加。与共连续二元共混物的行为相反，三元复合材料的性能往往因形貌变粗而恶化，它导致纤维之间产生更强的接触和更好的机械性能。这种行为可以用最近发展起来的力学模型来解释。
Ternary composites have been prepared via simultaneous melt extrusion of polyethylene (PE), polyamide-6 (PA6) and short glass fibres in a twin screw extruder. If the fibres are compatible with PA6 a network of fibres welded by domains of the minor PA6 phase is build within the matrix (PE) during the processing. Although a small amount of PA6 is added, the presence of the fibres promotes the continuity of this phase. Thus, the ternary mixture resembles the morphology of a co-continuous binary blend. In this paper the stability of the ternary composites upon annealing at temperatures above the melting of PA6 is studied. An increase of the dynamic tensile modulus is observed. Contrary to the behaviour of co-continuous binary blends, for which the properties often deteriorate due to morphology coarsening, in the ternary composites, it leads to the creation of stronger contacts between the fibres and better mechanical performance. This behaviour is accounted for by a recently developed mechanical model.