On the formation of defects in drawn polypropylene fibres
On the formation of defects in drawn polypropylene fibres
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DOI：
10.1016/0032-3861(96)81090-1
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发表时间：
1996
期刊：
影响因子：
4.6
通讯作者：
M. I. A. E. Maaty;D. Bassett;R. Olley;M. Dobb;J. Tomka;I. Wang
中科院分区：
文献类型：
--
作者：
M. I. A. E. Maaty;D. Bassett;R. Olley;M. Dobb;J. Tomka;I. Wang
拉伸聚丙烯纤维由具有低取向的准晶结构的初生纤维生产。在60°C下进行拉伸以防止次晶形式转变成单斜结构。用高锰酸腐蚀后的电子显微镜研究了初生纤维和一系列拉伸纤维的内部织构。在拉伸比为7和7以上时，可以观察到沿纤维沿着的一系列横向带。均匀区域与缺陷带交替，在蚀刻之后，缺陷带呈现为纵向空腔。随着拉伸比λ的增加，缺陷带变得更加规则并且高度增加，在λ = 8.3时几乎占据了所有样品。的缺陷，这是区域的密度降低，可能是空隙的性质，进行了讨论，并建议其形成的简化模型。
Drawn polypropylene fibres were produced from as-spun fibres with a paracrystalline structure of low orientation. Drawing was carried out at 60°C in order to prevent the transformation of the paracrystalline form into the monoclinic structure. The internal texture of the as-spun fibre and of a series of drawn fibres has been investigated by electron microscopy following permanganic etching. At draw ratios of 7 and above a series of transverse bands can be observed along the fibres. Homogeneous regions alternate with bands of defects which, after etching, appear as longitudinal cavities. Defect bands become more regular and increase in height with increasing draw ratio, λ, occupying almost all the sample at λ = 8.3. The nature of the defects, which are regions of reduced density, possibly voids, is discussed and a simplified model for their formation is suggested.