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首页> 外文期刊>Textile Research Journal >Surface Morphologies of Polypropylene Fibers Studied by Atomic Force Microscopy
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Surface Morphologies of Polypropylene Fibers Studied by Atomic Force Microscopy

机译：用原子力显微镜研究聚丙烯纤维的表面形态

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摘要

Surface morphologies of compact-spun polypropylene fibers spun with varying spin and tow draw ratios are characterized with atomic force microscopy (AFM). The surface structures are correlated to x-ray diffraction, birefringence, and fiber tenacity. The surface morphology of as-spun fibers is spherulitic at spin draw ratios lower than 500. With increasign spin draw raio, the morphologies develop into epitaxially crystallized structures, and a shish-kebab morphology is evident with spin draw ratios higher than 1000. When tow drawing is applied to spherulitic as-spun fibers, the surface morphology transforms into a fibrillar structure between draw ratios of 2.0 an 3.0. With the highest applicable draw ratio of 4.4, the microfibrils consist of alternating crystal blocks and amorphous regions with a periodicity of 12.3 nm. The difference between the long period values determined by AFM and SAXS is 2 on averge, indicating that the lamellae spacing between the surface and the bulk of the fibers is almost equal. Discontinuities in the long period as a function of spin and tow draw ratios are assigned to the morphological transformations revealed by AFM.
机译：用原子力显微镜（AFM）表征了具有不同纺丝和丝束牵引比的紧密纺聚丙烯纤维的表面形貌。表面结构与X射线衍射，双折射和纤维韧性相关。当纺丝拉伸比低于500时，初生纤维的表面形态呈球形。随着纺丝拉伸比的增加，该形态发展为外延结晶结构，而纺丝拉伸比高于1000时，则明显出现了烤肉串的形态。将拉伸应用于球形初生纤维，其表面形态在拉伸比为2.0至3.0之间转变为原纤维结构。微纤维的最高适用拉伸比为4.4，由交替的晶体块和周期为12.3 nm的非晶区组成。由AFM和SAXS确定的长周期值之间的差异平均为2，这表明纤维的表面和主体之间的薄片间距几乎相等。长期不连续性随纺丝和丝束拉伸比的变化被归因于AFM揭示的形态转变。

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