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Quantitative mapping of stress in soft materials by mechanochemistry

Abstract : Spiropyran (SP) has been incorporated into the first and the second networks of multiple network elastomers, respectively. SP transformed into merocyanin (MC) and changed its color (from colorless to blue or purple) in response to the external mechanical stimulus. The color change procedure in uniaxial extension was quantified by color analysis. A calibration curve of chromatic change as a function of stress was obtain in the same family of materials except quadruple networks. Varying the cross-linking density of the first network, SP was demonstrated to be a stress sensor. The stress distribution around the crack tip before and after propagation was obtained by applying the calibration curve of step cyclic loading. Additionally, the activation of SP in the second network showed the fracture mechanism and the reinforcement of multiple networks. To detect the strain field in the elastomers, particles tracking approach was applied. The stress and strain distribution obtained in this manuscript are helpful for the architecture of molecular model of multiple network elastomers.
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Yinjun Chen. Quantitative mapping of stress in soft materials by mechanochemistry. Chemical Physics [physics.chem-ph]. Université Paris sciences et lettres, 2018. English. ⟨NNT : 2018PSLET014⟩. ⟨tel-02496939⟩

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