4 years ago

A perfluoropolyether-based elastomers library with on-demand thermorheological features

A perfluoropolyether-based elastomers library with on-demand thermorheological features
Perfluoropolyether (PFPE)-based materials were obtained through thermal 1,3-dipolar Huisgen reactions. The formulations consisted in a combination of PFPE-functionalized oligomers (PFPE-diyne A2 and PFPE-diazide B2) and a pentaerythritol triazide cross-linker C3. Increasing the amount of C3 induced an increase of the cross-link density. This approach gave rise to materials ranging from rubber-like to gels. The networks formation was found to be governed by a constant activation energy and it was assumed that the whole process is controlled by the fast reaction between A2 and C3. Two glass transition temperatures were evidenced, one ascribed to hydrogen bonds that gradually shifted to a lower temperature with decreasing C3, while the other one was attributed to PFPE segments that constantly appeared at -−105°C. Thermogravimetric analyses under air recorded at a low heating rate of 1°Cmin−1 provided a valid estimate of the true temperature of degradation of the materials (ca. 200°C).

Publisher URL: www.sciencedirect.com/science

DOI: S0014305717309734

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