Effect of absorbed dose on structure and properties of dimeric acid polyamide

Abstract

Using a high-energy electron beam to study the influence of different absorbed doses on the structure and performance of dimeric acid polyamide. Fourier infrared spectroscopy confirmed that the C=C bond participated in the crosslinking reaction during the radiation process. With a increase in the absorbed doses, the softening point, gel content, rotational viscosity, and differential scanning calorimetry (DSC) melting peak Tm increased significantly,while the data of DSC melting enthalpy ΔHm declined slightly. According to the results of rheological data, as the absorbed doses increases, the viscosity η and the corresponding temperature Tj of the intersection of G' and G" increasing significantly, viscosity η and Tj were (195±5) Pa·s and 118.2 ℃, respectively, without the treatment of electron beam treatment. These values increased to (1 500±50) Pa·s and 144.7 ℃, respectively, with an absorbed dose of 120 kGy.

Keywords

• electron beam irradiation
• radiation crosslinking
• dimeric acid polyamide