共查询到19条相似文献,搜索用时 125 毫秒
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本文采用超高温高压法对芳纶1313进行染色,分别研究了染料种类和染色温度对芳纶1313纱线染色日晒牢度、K/S值及染透性等方面影响,结果发现,分散染料所染纱线的各项染色性能都比阳离子染料和还原染料好;随染色温度升高,日晒牢度、纤维表面颜色深度及其纤维染透性都得到了不同程度的改善,而纱线的断裂强度随染色温度的升高变化不大。 相似文献
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将聚对苯二甲酸乙二醇酯(PET)和玉石粉按一定质量比例共混熔融,制备出含玉石粉质量分数为0~1.8%的玉石粉/PET共混切片(简称共混切片)。分析了玉石粉含量对共混切片的流变性能、可纺性及玉石粉/PET预取向丝(POY)力学性能的影响。结果表明:随剪切速率的增加,共混切片黏度下降,其熔体为切力变稀流体;在相同剪切速率下,随着玉石粉含量增加,共混切片表观黏度变小,提高熔体温度,共混切片表观黏度变小;纺丝过程中,玉石粉质量分数超过1%时,断头现象增加;采用合适的喷丝孔孔径,有利于改善熔体的可纺性;随着玉石粉含量增加,纤维断裂强度和断裂伸长率都显著减少。 相似文献
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《合成技术及应用》2021,36(1):11-16
黑色缝纫线型短纤维在夏季高温季节容易出现断裂强力下降,纱线强力降低。在常规半光PET切片(特性黏度为0.680 dL/g)中添加质量分数7.0%黑色母粒(特性黏度为0.685 dL/g)混合后,进行熔融纺丝。通过优化牵伸工艺,三级牵伸工艺下的成品短纤维的物理性能明细优于两级牵伸工艺,且放置一个月后三级牵伸工艺的成品短纤维的断裂强度衰减幅度小。采用三级牵伸工艺,第一牵伸倍率为3.3、第二牵伸倍率为1.23、第三牵伸倍率为1.03、紧张热定型温度为210℃时,成品短纤维的断裂强度最高,达到6.31 cN/dtex, 180℃干热收缩率较小为3.28%。三级牵伸工艺下成品纤维的结晶度为43.4%,晶胞尺寸相对较为规整,取向度为90.1%,说明此工艺下成品纤维大分子取向结构较好,因此纤维的断裂强度较高。 相似文献
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研究了聚芳砜酰胺(PSA)纤维制备过程中各阶段拉伸倍数对纤维最终力学性能的影响,并制备出最高断裂强度达到3.62 cN/dtex的PSA纤维。要得到综合力学性能较高的PSA纤维,合适的表观喷头拉伸倍数为-50%~30%、塑化拉伸倍数为2、热拉伸倍数为2。PSA为较难结晶的高聚物,不论是聚合物粉末还是拉伸纤维,其结晶度都较低。PSA纤维的大分子取向与纤维的断裂强度关系十分密切,大分子取向因子与纤维的断裂强度呈线性关系,提高大分子取向程度是提高PSA纤维强度的重要途径。 相似文献
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S. H. Zeronian 《应用聚合物科学杂志》1970,14(2):365-372
The reactivity of mercerized, ethanol-washed, never-dried cotton, as indicated by acetylation, is higher than that of mercerized, water-washed, never-dried cotton. Hygroscopicity measurements indicate that the ethanol-washed cotton is not fully amorphous. They also reveal that the accessibility of cotton treated with caustic soda solution of mercerizing strength will be higher than that of cotton treated with ethylamine regardless of whether water or a solvent of lower hydrogen-bonding capacity is used to extract the swelling agent. Based on microscopic examination, acetylation of mercerized, ethanol-washed fibers apparently takes place relatively uniformly. The breaking load of cotton fibers is similar to that of mercerized, ethanol-washed cotton fibers of about 8% acetyl content. However, the crystallinity of these materials, as shown by hygroscopicity studies, is markedly different. This indicates that the fine structure of the cotton fiber can be modified considerably without causing a loss in strength. Yarn tensile tests indicate that mercerized, ethanol-washed cotton yarn with acetyl content between 10% and 30% has a breaking load which is about 12% lower than that of cotton. 相似文献
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