Study on the Molecular Mobility in the Polyamide/SrFeO Composites by In Situ Infrared Spectroscopy

Key Words:composites; FT-IR; glass transition; polyamides

Abstract:Polyamide 6(PA6) and its composite with strontium ferrite (SrFeO) magnetic powders at different concentration levels (33%, 80%) are in situ investigated by temperature-dependent Fourier transform infrared spectroscopy (FT-IR). It is found that the intensity changes of the "free" (nonhydrogen bonded) N-H stretching vibration as a function of temperature can be used to determine the glass transition (T-g) and melting temperature (T-m); whereas the hydrogen-bonded N-H stretching vibration is only sensitive to T-m. Our results reveal that high SrFeO contents increase the T-g and T-m of PA6. These observations suggest that the molecular chains of PA6 are confined with increasing content of SrFeO.

Volume:51

Issue:9

Translation or Not:no