Abstract
The thermal ageing of a neat epoxy matrix has been studied at 473 K in air by three complementary analytical techniques: optical microscopy, dynamic mechanical analysis and nano-indentation. Thermal oxidation is restricted in a superficial layer of about 195 μm of maximal thickness. It consists in a predominant chain scission process involving, in particular, chemical groups whose β motions have the highest degree of cooperativity and thus, are responsible for the high temperature side of β dissipation band. As a result, chain scissions decrease catastrophically the glass transition temperature, but also increase significantly the storage modulus at glassy plateau between T β and T α. This phenomenon is called “internal antiplasticization”. Starting from these observations, the Di Marzio and Gilbert’s theories have been used in order to establish relationships between the glass transition temperature and number of chain scissions, and between the storage modulus and β transition activity respectively. The challenge is now to establish a relationship between the β transition activity and the concentration of the corresponding chemical groups.
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Terekhina, S., Mille, M., Fayolle, B. et al. Oxidation induced changes in viscoelastic properties of a thermostable epoxy matrix. Polym. Sci. Ser. A 55, 614–624 (2013). https://doi.org/10.1134/S0965545X13090058
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DOI: https://doi.org/10.1134/S0965545X13090058