• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >UV excimer laser and low temperature plasma treatments of polyamide materials.
【24h】

UV excimer laser and low temperature plasma treatments of polyamide materials.

机译：紫外线准分子激光和聚酰胺材料的低温等离子体处理。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Polyamides have found widespread application in various industrial sectors, for example, they are used in apparel, home furnishings and similar uses. However, the requirements for high quality performance products are continually increasing and these promote a variety of surface treatments for polymer modification. UV excimer laser and low temperature plasma treatments are ideally suited for polyamide modification because they can change the physical and chemical properties of the material without affecting its bulk features.;This project aimed to study the modification of polyamides by UV excimer laser irradiation and low temperature plasma treatment. The morphological changes in the resulting samples were analysed by scanning electron microscopy (SEM) and tapping mode atomic force microscopy (TM-AFM). The chemical modifications were studied by x-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and chemical force microscopy (CFM). Change in degree of crystallinity was examined by differential scanning calorimetry (DSC).;After high-fluence laser irradiation, topographical results showed that ripples of micrometer size form on the fibre surface. By contrast, sub-micrometer size structures form on the polyamide surface when the applied laser energy is well below its ablation threshold. After high-fluence laser irradiation, chemical studies showed that the surface oxygen content of polyamide is reduced. A reverse result is obtained with low-fluence treatment. The DSC result showed no significant change in degree of crystallinity in either high-fluence or low-fluence treated samples.;The same modifications in polyamide surfaces were studied after low temperature plasma treatment with oxygen, argon or tetrafluoromethane gas. The most significant result was that the surface oxygen content of polyamide increased after oxygen and argon plasma treatments. Both treatments induced many hydroxyl (-OH) and carboxylic acid (-COOH) functional groups, which increased water absorption. However, after tetrafluoromethane plasma treatment it was found that the -CF, -CF2 and -CF3 groups were introduced to the polyamide surface and this enhanced the hydrophobicity of the fabric.;Suggested explanations are given of the mechanisms that produce the structure of the polyamide after the processes of laser irradiation (both high- and low-fluence) and plasma treatment. The fundamental approach used in modelling was considered the temperature profile of the material during the treatment. The development of high-fluence induced structures was caused by elevated temperatures in the subsurface volume and preexisting stress caused by fiber extrusion. The structure formation under LF laser irradiation was determined by thermal effect accompanied by the optical phenomenon of interference. Ripple structures formed by plasma were closely related to physical or chemical etching.;Possible applications of plasma and laser technologies in the textile and clothing industries are considered. Oxygen plasma seems to be the best candidate to improve the wettability of the fabric, while tetrafluoromethane plasma can be applied to produce a water repellent surface. Surface treatments including CF4 plasma, high-fluence and low-fluence laser treatments produce a deeper color in disperse dyed fabrics using the same amount of dyestuff as chemicals like leveling agents and dyestuff can be reduced during the textile manufacturing process.;UV laser and low temperature plasma modification processes are promising techniques for polymer/fabric surface modification and have industrial potential as they are environmentally friendly dry processes which do not involve any solvents.
机译：聚酰胺已在各种工业领域中得到广泛应用，例如，它们被用于服装，家具和类似用途。然而，对高质量产品的要求不断增加，并且这些要求促进了用于聚合物改性的多种表面处理。 UV受激准分子激光和低温等离子体处理非常适合用于聚酰胺改性，因为它们可以改变材料的物理和化学性质而不会影响其体积特征。;该项目旨在研究UV受激准分子激光辐照和低温对聚酰胺的改性等离子处理。通过扫描电子显微镜（SEM）和敲击模式原子力显微镜（TM-AFM）分析所得样品的形态变化。通过X射线光电子能谱（XPS），飞行时间二次离子质谱（ToF-SIMS）和化学力显微镜（CFM）研究了化学修饰。通过差示扫描量热法（DSC）检查了结晶度的变化。高通量激光照射后，形貌结果表明在纤维表面上形成了微米级的波纹。相反，当所施加的激光能量远低于其烧蚀阈值时，亚微米尺寸的结构会在聚酰胺表面形成。在高通量激光照射后，化学研究表明聚酰胺的表面氧含量降低了。使用低通量处理可获得相反的结果。 DSC结果表明，无论是高通量还是低通量处理的样品，其结晶度均无显着变化。在用氧气，氩气或四氟甲烷气体进行低温等离子体处理后，研究了聚酰胺表面的相同改性。最显着的结果是，经过氧气和氩气等离子体处理后，聚酰胺的表面含氧量增加了。两种处理均诱导许多羟基（-OH）和羧酸（-COOH）官能团，从而增加了吸水率。然而，在四氟甲烷等离子体处理之后，发现-CF，-CF2和-CF3基团被引入到聚酰胺表面，这增强了织物的疏水性。;给出了产生聚酰胺结构的机理的建议解释。经过激光照射（高通量和低通量）和等离子处理之后。在建模过程中使用的基本方法被认为是材料在处理过程中的温度曲线。高通量诱导结构的发展是由于地下体积的温度升高和纤维挤出引起的预先存在的应力引起的。 LF激光辐照下的结构形成是由热效应以及伴随的光学干涉现象决定的。等离子体形成的波纹结构与物理或化学蚀刻密切相关。；考虑了等离子体和激光技术在纺织和服装工业中的可能应用。氧等离子体似乎是改善织物润湿性的最佳候选者，而四氟甲烷等离子体可用于产生疏水表面。包括CF4等离子体，高通量和低通量激光处理在内的表面处理使用相同量的染料在分散染色的织物中产生更深的颜色，因为在纺织品制造过程中可以减少流平剂和染料等化学物质的使用; UV激光低温度等离子体改性工艺是用于聚合物/织物表面改性的有前途的技术，并且具有工业潜力，因为它们是不涉及任何溶剂的环保干法工艺。

著录项

  • 作者

    Yip, Yiu Wan Joanne.;

  • 作者单位

    Hong Kong Polytechnic University (Hong Kong).;

  • 授予单位 Hong Kong Polytechnic University (Hong Kong).;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 341 p.
  • 总页数 341
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号