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OALib Journal期刊
ISSN: 2333-9721
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牵伸作用对尼龙6纤维晶型结构及力学性能的影响
DOI: 10.11777/j.issn1000-3304.2014.14129, PP. 1643-1647
Keywords: 尼龙6,牵伸,晶型结构,力学性能
Abstract:
利用广角X射线衍射仪(WAXD)、傅里叶变换红外光谱仪(FTIR)、示差扫描量热仪(DSC)、声速取向测量仪、扫描电镜(SEM)以及纱线强伸度仪研究了不同牵伸倍数尼龙6复丝的晶型结构、熔融行为、取向度、表面形貌以及力学性能.结果表明,随着牵伸倍数的增加,伴随着γ晶型片晶的生长以及非晶区链段重排诱导α晶型的生成,尼龙6复丝的结晶度不断的提高,在牵伸倍数达到3倍时,样品中出现了α晶型的特征衍射峰,导致了其熔融温度的提高以及多重熔融峰的出现.同时,牵伸作用也增加了分子链沿纤维轴向的取向程度,消除了纤维表面的残余应力,改善了纤维的表面缺陷.在这些因素的共同作用下,尼龙6复丝的力学性能得到了一定程度的提高,当牵伸倍数为3倍时,拉伸强度与拉伸模量分别达到了5.0cN/dtex和28.9cN/dtex,与较低牵伸倍数相比较均有所提高.
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