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首页> 外文期刊>Journal of Materials Science >X-ray diffraction investigations of a-polyamide б films: orientation and structural changes upon uni- and biaxial drawing
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X-ray diffraction investigations of a-polyamide б films: orientation and structural changes upon uni- and biaxial drawing

机译：α-聚酰胺б膜的X射线衍射研究：单轴和双轴拉伸后的取向和结构变化

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摘要

We have investigated the influence of drawing on orientation, crystallinity, and structural properties of polyamide 6 films using X-ray diffraction. The samples were uniaxially and biaxially stretched resulting in the formation of monoclinic crystallites (a-form) in the size range of 8-10 nm. Depending on the drawing ratio, a degree of crystallinity of up to 60% is obtained. The average orientation of the crystallite axes was evaluated using the pole figure technique. The b*-axis, which corresponds to the chain diréction of the polyamide molecules, lies in the film plane and shows a preferred orientation upon drawing. For uniaxial drawing, b* aligns with the drawing direction. For biaxially drawn films, which were prepared using the sequential stretching method, the second drawing determines the orientation of b*, at least at the center of the films. At the sides, b* is located between the two drawing directions reflecting the inhomogeneous distribution of mechanical stress during stretching.
机译：我们使用X射线衍射研究了拉伸对聚酰胺6薄膜的取向，结晶度和结构性能的影响。将样品单轴和双轴拉伸，从而形成尺寸范围为8-10 nm的单斜晶体（a型）。取决于拉伸比，获得高达60％的结晶度。使用极图技术评估微晶轴的平均取向。 b *轴对应于聚酰胺分子的链向，位于膜平面中，并且在拉伸时显示出优选的取向。对于单轴拉伸，b *与拉伸方向对齐。对于使用顺序拉伸方法制备的双轴拉伸薄膜，第二次拉伸至少在薄膜中心确定了b *的方向。在侧面，b *位于两个拉伸方向之间，反映了拉伸过程中机械应力的不均匀分布。

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