Polypropylene/bis(benzoxazolyl)stilbene mechanochromic blends, an attractive feature for colorimetric strain detection
Résumé
Bis(benzoxazolyl)stilbene (BBS) incorporation into polypropylene (PP) host leads to a mechanochromic polymer composite blend whose color can change (from green to blue) under UV excitation with mechanical strain. The aim of this study is to prove the feasibility of mechanical strain control by colorimetry on such a mechanochromic blend and to understand the mechanical, chemical and radiative behaviors differences between stretched and unstretched parts. The first part, dedicated to mechanical and radiative characterizations, leads to the choice of the dye concentration of 1%wt, where mechanical properties are preserved and photoluminescence output is optimized. Then, a colorimetric measurement system is set-up and show remarkable potential for strain evaluation by marking the necking initiation and the beginning of the first plastic flow. Moreover, the change in luminescence emission is concomitant with mechanical necking and continues during the first plastic flow. Secondly, the RGB image treatment analysis developed here involves the calculation of the image ratio of the green channel over the blue one. It promises remarkable capacities to detect and localize the very beginning of mechanical break on polymeric 2D structures.
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