Abstract
Aramid nanofibers (ANFs) have been extensively explored in various fields since their emergence as high-performance nanoscale building blocks. ANF films exhibit strong sensitivity to ultraviolet (UV) irradiation which could deteriorate their performances. However, the sensitivity to UV irradiation has not been sufficiently understood yet. In this paper, for the first time, the surface structure and performance evolution of UV-irradiated ANF films are evaluated systematically. Results demonstrate that the fibrous nanofibers on the ANF films surface have been ultimately degraded into powdery nanoparticles, resulting from the chain scission, and the oxidation of amides groups in the ANFs. Moreover, newly formed anhydride has also been detected, which is derived from the chemical crosslinking of the oxidation products of the ANFs. Due to such structural evolution, some parameters of the ANF films display a downward trend within 72 h, and then a rising trend in the next 96 h. These parameters include the surface roughness, mechanical properties, water contact angles and temperature of weight loss at 10% (TG10%) of ANF films, while the crystallinity and temperature of maximum derivative weight curve (Tmax) present opposite results.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
