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首页> 外文期刊>Journal of Applied Polymer Science >Polyoxymethylene orientation by equal-channel multiple angular extrusion
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Polyoxymethylene orientation by equal-channel multiple angular extrusion

机译：等通道多角度挤出法制备聚甲醛

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摘要

The effect of conditions and routes of deformation in the course of equal-channel multiple-angular extrusion (ECMAE) on physical and mechanical properties of polyoxymethylene (POM) have been studied. As deformation routes, Route C (shear planes are parallel, and the simple shear direction of every deformation zone is changed through 180°) and Route E (shear planes are turned through ±45° around the extrusion axis and the normal to the axis, and simple shear direction is changed through 180° or ±90° with respect to the deformation zone) were selected. It has been shown that ECMAE provides the increase of modulus of elasticity E more than twice, tensile strength σ _T increases in four times. At the same time, strain at break ε _b is reduced by 1.5%. The value of the achieved effects depends on the accumulated deformation and the selected deformation route. The best set of physical and mechanical characteristics was observed in the case of Route E. According to SEM data, Route C results in partial pore healing and E provides total pore healing both in longitudinal and transversal direction. The observed effects are related to orientation order formation, increase of cristallinity degree and reduction of structure imperfection of extrudates.
机译：研究了等通道多角挤压（ECMAE）过程中变形条件和路径对聚甲醛（POM）物理和机械性能的影响。作为变形路线，路线C（剪切面平行，每个变形区的简单剪切方向改变180°）和路线E（剪切面绕着挤出轴和法线方向旋转±45°），并选择相对于变形区域为180°或±90°的简单剪切方向）。已经表明，ECMAE提供的弹性模量E增加了两倍以上，抗张强度σ_T增加了四倍。同时，断裂应变ε_b降低了1.5％。达到的效果值取决于累积的变形和所选的变形路径。在路线E的情况下，观察到了最佳的物理和机械特性。根据SEM数据，路线C导致部分毛孔愈合，而E在纵向和横向均提供了总的毛孔愈合。观察到的效果与取向顺序的形成，结晶度的增加和挤出物的结构缺陷的减少有关。

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