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首页> 外文期刊>Journal of Applied Polymer Science >Cavitation during deformation of polymers on the example of polypropylene
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Cavitation during deformation of polymers on the example of polypropylene

机译：以聚丙烯为例的聚合物变形过程中的空化

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Cavitation during uniaxial deformation of isotactic polypropylene (PP) was studied in samples having different amounts of α and β crystals. It has been shown that deformation is always accompanied by neck formation. Because the very beginning the plastic deformation is accompanied by cavitation. The scale of cavitation, determined with the use of X-ray scattering and volume measurements increases with an increase of the content of β phase in the examined samples. Cavities change their shape with deformation-at first they are elongated perpendicularly to the direction of stretching, next, at the strain of 1.5, they reorient in the direction of deformation, which is connected with changes in the surrounding lamellar structure. The calculations of Guinier's radius showed that two populations of voids are present in deformed PP samples, characterized by the gyration radii of 5 and 13 nm for small deformations. Estimations based on the volume increase and sizes of cavities indicate that typically more than one cavity are present in amorphous layers adhering to lamella surfaces.
机译：在具有不同数量的α和β晶体的样品中研究了全同立构聚丙烯（PP）单轴变形过程中的空化现象。已经表明，变形总是伴随着颈部的形成。因为最开始塑性变形伴随着气穴现象。使用X射线散射和体积测量确定的空化规模随所检查样品中β相含量的增加而增加。腔随着变形而改变形状：首先，它们垂直于拉伸方向伸长，然后在应变为1.5时，它们沿变形方向重新定向，这与周围的层状结构的变化有关。吉尼尔半径的计算表明，变形的PP样品中存在两个空隙，其特征是小变形时的旋转半径为5和13 nm。基于孔的体积增加和尺寸的估计表明，通常在粘附于薄片表面的无定形层中存在一个以上的孔。

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