DMTA and DSC analyses of composite PA 6,6 with glass fibre after dye addition and ageing

Adam Gnatowski, Dariusz Kwiatkowski, Jacek Nabiałek

Quarterly No. 3, 2011 pages 247-251

DOI:

keywords: composites, dynamic properties, thermal properties, structure, polyamide 6,6, glass fibre, dye, ageing

abstract Determination of the influence of a dye addition and electrochemical ageing on the change of dynamic mechanical properties, investigated by the DMTA method for samples made of polyamide 6,6 composite with glass fibre was the aim of this work. Using this equipment, the dynamical properties of polyamide 6,6 composite in relation to the temperature and frequency were determined. The samples were bended with a frequency of 1 Hz and 10 Hz in a temperature range from −50 to 160°C and a heating rate of 2 K/min. A decrease of the value storage modulus for PA 6,6 with a content of 25% of glass fibre addicion after ageing was observed. A similar dependence was obtained for samples with dye addition. A similar dependence also was obtained for the frequency 1 and 10 Hz. With an increase of temperature, the storage modulus decreases. It was found, that after electrochemical ageing, the value of tanδ decreases. Investigation of the crystallinity degree using the DSC method as well as the investigation of the structure using optical microscopy have been made. The DSC investigations prove the decrease in the crystallization degree of PA 6,6/glass fibre composite for the samples with ageing and dye addition. The investigation results provide information about dyed PA 6,6/glass fibre composite behaviour after ageing, which can be useful in practice, when selecting the material for parts that will have to work in conditions of electrochemical ageing.