• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of coatings technology and research >Critical role of particle/polymer interface in photostability of nano-filled polymeric coatings
【24h】

Critical role of particle/polymer interface in photostability of nano-filled polymeric coatings

机译：颗粒/聚合物界面在纳米填充聚合物涂层光稳定性中的关键作用

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

Nanoparticle-filled polymeric coatings have attracted great interest in recent years because the incorporation of nanofillers can significantly enhance the mechanical, electrical, optical, thermal, and antimicrobial properties of coatings. Due to the small size of the fillers, the volume fraction of the nanoparticle/ polymer interfacial area in nano-filled systems is drastically increased, and the interfacial region becomes important in the performance of the nano-filled system. However, techniques used for characterizing nanopar-ticle/polymer interfaces are limited, and thus, the mechanism by which interfacial properties affect the photostability and the long-term performance of nano-filled polymeric coatings is not well understood. In this study, the role of the nanoparticle/polymer interface on the ultraviolet (UV) stability of a nano-ZnO-filled polyurethane (PU) coating system was investigated. The effects of parameters influencing the particle/ polymer interfacial properties, such as size, loading, surface modification of the nanoparticles, on photo-degradation of ZnO/PU films were evaluated. The nature of the interfacial regions before and after UV exposures were characterized by atomic force microscopy (AFM)-based techniques. Results have shown that the interfacial properties strongly affect chemical, thermo-mechanical, and morphological properties of the UV-exposed ZnO/PU films. By combining tapping mode AFM and novel electric force microscopy (EFM), the particle/polymer interfacial regions have been successfully detected directly from the surface of the ZnO/PU films. Further, our results indicate that ZnO nanoparticles can function as a photocatalyst or a photostabilizer, depending on the UV exposure conditions. A hypothesis is proposed that the polymers in the vicinity of the ZnO/PU interface are preferentially degraded or protected, depending on whether ZnO nanoparticles act as a photocatalyst or a photostabilizer in the polymers. This study clearly demonstrates that the particle/polymer interface plays a critical role in the photostability of nano-filled polymeric coatings.
机译：近年来，纳米粒子填充的聚合物涂料引起了极大的兴趣，因为掺入纳米填料可以显着提高涂料的机械，电，光学，热和抗菌性能。由于填料的尺寸小，纳米填充系统中纳米颗粒/聚合物界面区域的体积分数急剧增加，并且界面区域在纳米填充系统的性能中变得重要。然而，用于表征纳米粒子/聚合物界面的技术是有限的，因此，人们对界面性质影响光稳定性和纳米填充聚合物涂层的长期性能的机理还不甚了解。在这项研究中，研究了纳米颗粒/聚合物界面对纳米ZnO填充聚氨酯（PU）涂料体系的紫外线（UV）稳定性的作用。评估了影响颗粒/聚合物界面特性的参数，例如尺寸，负载，纳米颗粒的表面改性，对ZnO / PU薄膜光降解的影响。通过基于原子力显微镜（AFM）的技术对UV暴露前后的界面区域进行了表征。结果表明，界面性质强烈影响紫外线暴露的ZnO / PU膜的化学，热机械和形态学性质。通过结合振实模式原子力显微镜和新型电力显微镜（EFM），已经成功地直接从ZnO / PU膜的表面检测到了颗粒/聚合物界面区域。此外，我们的结果表明，取决于紫外线暴露条件，ZnO纳米颗粒可以充当光催化剂或光稳定剂。提出了一种假设，即取决于ZnO纳米粒子在聚合物中充当光催化剂还是光稳定剂，ZnO / PU界面附近的聚合物会优先降解或受到保护。这项研究清楚地表明，颗粒/聚合物界面在纳米填充聚合物涂层的光稳定性中起着至关重要的作用。

著录项

  • 来源
    《Journal of coatings technology and research》 |2012年第3期|p.251-267|共17页
  • 作者

    Xiaohong Gu; Guodong Chen; Minhua Zhao; Stephanie S. Watson; Tinh Nguyen; Joannie W. Chin; Jonathan W. Martin;

  • 作者单位

    Materials and Construction Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Materials and Construction Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Materials and Construction Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Materials and Construction Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Materials and Construction Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Materials and Construction Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

    Materials and Construction Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ZnO nanoparticles; interface; photodegradation; accelerated test; polyurethane; waterborne; polymeric coatings; UV irradiation; NIST SPHERE;

    机译：ZnO纳米颗粒;接口;光降解加速测试;聚氨酯水性聚合物涂料;紫外线照射NIST球;

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