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首页> 外文期刊>Journal of Applied Polymer Science >Strengthening and stiffening of ramie yarns by applying cyclic load treatment
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Strengthening and stiffening of ramie yarns by applying cyclic load treatment

机译：麻纱线的周期性加荷处理使其硬化和硬化

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A cyclic load treatment was developed by applying a load on ramie yams up to a proper value and then unloading for different number of cycles under high temperature or wet state. The results of tensile tests revealed that compared to the untreated yarns, a significant increase of around 20-50% in tensile strength was obtained for the cyclic load-treated yarns. Young's modulus of cyclic load-treated yarns was increased drastically, one to two times higher than the initial value. The number of cycles had an influence on improving the tensile properties of ramie yarns. After the individual heat or wet treatment without cyclic load, it was found that tensile strength of treated yarns remained unchanged as the original value while Young's modulus was decreased remarkably, which implies that the introduction of cyclic load to individual heat or wet treatment plays a crucial role in strengthening and stiffening of ramie yarns. It was considered that the improved effect was correlated with the decreased microfibrillar angle and the increased orientation of amorphous region in fiber microstructure because the crystallinity and crystalline orientation of ramie yarns calculated from X-ray diffraction diagrams showed little change after cyclic load treatment. (C) 2008 Wiley Periodicals, Inc.
机译：通过在麻纱上施加最大适当值的负载，然后在高温或湿润状态下进行不同数量的循环卸载，从而开发出一种循环负载处理方法。拉伸试验的结果表明，与未处理的纱线相比，经循环负载处理的纱线的抗张强度显着提高了约20-50％。循环载荷处理过的纱线的杨氏模量急剧增加，比初始值高一到两倍。循环次数对改善麻纱的拉伸性能有影响。经过单独的热处理或湿法处理后没有循环载荷，发现处理过的纱线的拉伸强度保持原始值不变，而杨氏模量却显着降低，这表明将循环载荷引入单独的热处理或湿法处理至关重要。在增强和增强yarn麻纱线中的作用。可以认为，改善的效果与纤维微结构中微纤丝角的减小和非晶区取向的增加有关，这是因为由X射线衍射图计算得出的ie麻纱的结晶度和结晶取向在循环载荷处理后几乎没有变化。 （C）2008 Wiley期刊公司

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