共查询到18条相似文献,搜索用时 156 毫秒
1.
染色对PTT纤维聚集态结构的影响 总被引:1,自引:0,他引:1
研究了染色温度和时间对PTT纤维上染率和聚集态结构的影响。结果表明,随染色温度升高,PTT纤维的上染率提高,最佳染色温度为110℃;在110℃时,染料分子容易进入纤维的非晶区,染色开始时纤维的上染率明显升高,染色时间对纤维上染率的影响不大;在90℃时,染色前期PTT纤维的上染率较低,随着染色时间的延长,纤维的结晶度和晶区取向降低,上染率明显升高;在130℃时,纤维的冷结晶过程容易发生,大分子链排列紧密,纤维的上染率降低。 相似文献
2.
3.
热定型对p-POD纤维结构和性能的影响 总被引:1,自引:0,他引:1
以对苯二甲酸和硫酸肼为单体,合成了聚对苯撑-1,3,4-噁二唑(p-POD),通过湿法纺丝制得了p- POD纤维。研究了热定型条件对p-POD纤维结构和性能的影响。结果表明,p-POD初生纤维随着热定型时间的增加环化度增大;短时间的热定型处理可使纤维的结晶度达到最大,长时间的热定型对纤维的结晶度贡献不大。热定型使p-POD纤维的取向度降低,增加了纤维表面的缺陷。热定型对p-POD纤维力学性能的影响不大,但对纤维的耐热性影响较大,经过热定型处理后,p-POD纤维的热分解温度提高了17℃。 相似文献
4.
在不同拉伸条件下,对聚丙烯腈(PAN)纤维进行热处理。借助傅里叶变换红外光谱、X射线衍射等表征手段,研究了PAN纤维热稳定化过程中,拉伸张力对纤维分子链聚集态结构及化学反应的影响。结果表明:PAN纤维热处理过程中,施加张力会在一定程度上影响纤维的环化反应。当热处理温度较低(180℃)时,施加张力可抑制环化反应的发生;热处理温度较高(大于200℃)时,拉伸张力有利于环化反应的发生。热处理过程中,施加张力,对PAN纤维结晶度影响较小,晶区取向和全取向度增加,晶粒尺寸增大。这是由于拉伸与温度双重作用影响了纤维的聚集态结构,导致参与环化反应的分子数量发生变化。 相似文献
5.
研究了染色条件对聚对苯二甲酸丙二酯(PTT)纤维上染率、纤维截面直径、力学性能和回弹性能的影响。结果表明:由于染料分子对纤维的膨润作用,使得纤维染色后截面直径增大,截面形状的圆整度提高,重量明显增大;使纤维的线密度增大,断裂强度降低,而初始模量、断裂伸长率和断裂比功变化的规律性不强。染色对于PTT纤维的拉伸回弹性有明显的影响,但对于其弯曲回弹性影响并不大。随着染色温度的提高,纤维的拉伸回弹率有所提高,而弯曲回弹率有所降低;但染色时间对拉伸和弯曲回弹率基本没有影响。 相似文献
6.
聚乳酸纤维分散染料染色工艺的研究 总被引:3,自引:0,他引:3
本文主要研究了聚乳酸纤维用分散染料的染色工艺染料在高于7n℃时上色,在100~110℃上染率达到最大,上染率随时间延长而增加,30分钟达到平衡;染浴的pH在3~7时对纤维的损伤较小,浴比对上染率影响较小,pH值上升.纤维强度随之降低,选择适合的染色助剂可提高上染率。 相似文献
7.
《合成纤维工业》2016,(2):34-38
采用UVA,UVB,UVC 3种波段紫外光分别对聚对苯撑苯并双噁唑(PBO)纤维进行照射,研究了不同照射时间下PBO纤维的结构与性能。结果表明:PBO纤维经不同波段紫外光照射6 d时,UVA照射后纤维噁唑环稳定性降低,断裂强力下降率为5.42%,UVB照射后纤维噁唑环开始发生开环,断裂强力下降率为13.46%,UVC照射后纤维噁唑环已打开,断裂强力下降率为18.96%;经UVA,UVB,UVC照射13 d后,PBO纤维断裂强力下降率分别为19.36%,38.65%,53.13%,PBO纤维大分子均遭到破坏;UVC照射后PBO纤维起始分解温度下降至51℃,UVA,UVB照射后PBO纤维基本能保持自身良好的热学性能;PBO纤维最敏感的紫外光是UVC,其次是UVB,最后是UVA。 相似文献
8.
研究了碱处理对PTT纤维的结构性能及其表面形态的影响。结果表明:PTT纤维经碱处理后,表面形成明显的坑穴,结晶结构和热性能变化不大,强度有所降低,吸湿性能、染色性能有所提高。当减量率达到16.35%时,其上染率明显提高。研究结果对改善PTT纤维的染色性能及开发PTT纤维混纺或交织物同浴碱处理具有一定的意义。 相似文献
9.
研究了改性聚芳噁二唑(POD)纤维分别在300℃热空气中、氙灯照射老化过程中、H_2O_2溶液以及酸碱溶液浸泡过程中纤维力学性能的变化情况,并与间位芳纶和聚酰亚胺纤维进行对比。结果表明:300℃热空气中,经过168 h老化,改性POD纤维的强度保持率在50%左右,纤维的断裂伸长率保持率在20%左右;在氙灯照射72 h后,纤维强度保持率在80%以上,纤维伸长率保持率在50%以上;改性POD纤维的耐氧化性和耐碱性较好。 相似文献
10.
11.
Improving the UV resistance of aromatic poly(l,3,4‐oxadiazole) fiber using a disperse dye modified with octavinyl POSS. Part 1: Preparation of dye and dyeing
下载免费PDF全文
![点击此处可从《应用聚合物科学杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Modified dyes were obtained by grafting of disperse dyes with octavinyl polyhedral oligomeric silsesquioxanes (POSS) using a Friedel‐Crafts alkylation reaction and using different ratios of POSS and the original disperse dye. The modified dyes are used to dye aromatic poly(l,3,4‐oxadiazole) (p‐POD) fiber to improve its UV resistance. Then the structure of the modified dye is characterized by Fourier transform infrared spectroscopy and NMR, and the effects of the structure of the modified dye and the dyeing conditions on the UV resistance and color strength (K/S value) of the dyed samples are investigated. The results indicated that the UV adsorption peaks of the modified dye solutions are located at the specified UV wavelengths. The UV resistance of the p‐POD fiber dyed with the modified dye (1:3) can be effectively improved, and the dyed p‐POD fiber can obtain a higher K/S value simultaneously. During the dyeing process, increasing the dyeing temperature and prolonging the dyeing time are both beneficial in improving the anti‐UV ability of the dyed p‐POD fiber; these changes can effectively promote the fixation of dye molecules into p‐POD fibers due to stimulating the motion of dye molecules and p‐POD macromolecules. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44745. 相似文献
12.
13.
14.
15.
介绍了腈纶的上色性能,研究了细旦腈纶染浴pH值和染浴温度对细旦腈纶染色的影响。结果表明:适当降低起染温度,控制好升温速度和保温时间,调整合适的染浴pH值,可有效提高细旦腈纶的染色效果。 相似文献
16.
17.
水解条件对改性腈纶染色性能的影响 总被引:3,自引:0,他引:3
探讨了水解温度、氢氧化钠浓度和水解时间对改性腈纶的染色性能的影响。纤维水解后结构发生了变化,用阳离子染料上染水解纤维时,染料的平衡上染量有较大的提高。提高水解温度、增加氢氧化钠浓度和延长水解时间,均能提高改性腈纶的染色性能。考虑到纤维的力学性能,较为适宜的水解条件为氢氧化钠质量分数12%~15%,水解温度低于90℃,水解时间为12~15 min。 相似文献
18.
Ultrasonic‐assisted dyeing: II. Nylon fibre structure and comparative dyeing rate with reactive dyes
Comparative dyeing kinetics of nylon‐6 fibre with different reactive dyes using conventional and ultrasonic conditions are presented. The time/dye‐uptake isotherms are revealing the enhanced dye‐uptake in the second phase of dyeing (diffusion phase). The data of dyeing rate fit well with the integrated form of the first‐order rate equation and values of dyeing rate constant and half‐time of dyeing are discussed. Ultrasonic efficiency in accelerating the dyeing rate relative to conventional heating was examined for all dyes used to show that ultrasonics are most effective for a dyeing system which has difficulty in achieving high dye‐uptake. To clarify the role of fibre fine structure and whether it is affected during dyeing with ultrasonic waves, time‐dependent ultrasonic pre‐treatment of nylon‐6 fibres and its effect on the colour strength obtained is presented. X‐ray diffraction studies on nylon‐6 fibres conventionally and ultrasonically pre‐treated have shown that the percentage of fibre crystallinity has become higher in ultrasonically treated fibre in comparison with that of conventionally treated. Although the increased crystallinity of the fibre, which occurs simultaneously during the ultrasonic dyeing process, would retard dye uptake, it seems that the enhanced effect of power ultrasonic is high enough to overcome this side‐effect on the fibre. © 2003 Society of Chemical Industry 相似文献