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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Sensitivity of Dielectric Properties to Wear Process on Carbon Nanofiber/High-Density Polyethylene Composites | Liu et al. Nanoscale Res Lett 2011 6 7 http www.nanoscalereslett.eom content 6 1 7 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Sensitivity of Dielectric Properties to Wear Process on Carbon Nanofiber High-Density Polyethylene Composites Tian Liu Weston Wood Wei-Hong Zhong Abstract We examined the correlation of wear effects with dielectric properties of carbon nanofibers CNFs untreated and organosilane-treated -reinforced high-density polyethylene HDPE composites. Wear testing for the nanocomposites over up to 120 h was carried out and then dielectric permittivity and dielectric loss factor of the polymer composites with the increased wear time were studied. Scanning electron microscope and optical microscope observations were made to analyze the microstructure features of the nanocomposites. The results reveal that there exist approximate linear relationships of permittivity with wear coefficient for the nanocomposites. Composites containing silanized CNFs with the sufficiently thick coating exhibited high wear resistance. The change in permittivity was more sensitive to the increased wear coefficient for the nanocomposites with lower wear resistance. This work provides potential for further research on the application of dielectric signals to detect the effects of wear process on lifetime of polymeric materials. Introduction Making polymers into nanocomposites with the addition of appropriate nanofillers has been shown to be an effective way to obtain a multitude of enhanced properties and even extend to multi-functionalities not normally considered possible for polymeric materials. A variety of properties such as physical thermal mechanical and others as well as combinations of them have been investigated for numerous nanocomposites in order to meet the burgeoning demands of industry. For example carbon nanofillers such as carbon nanotubes CNTs and carbon nanofibers CNFs not only improve electrical conductivity and dielectric .
