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Sunday, 31 May 2020
Raw materials & technologies, Applications

Shape memory composite self-healing coatings for corrosion protection

Tuesday, 19 July 2016

A shape memory composite (SMC) coating with a self-healing ability was prepared by a facile method based on a thermoresponsive shape memory polymer (SMP) that utilised carnauba wax microparticles as healing agent.

Carnauba is a wax of the leaves of the palm <emphasize>Copernicia cerifera</emphasize>, a plant native to the north-east of Brazil. Source: Tacarijus - Own work;
Carnauba is a wax of the leaves of the palm Copernicia cerifera, a plant native to the north-east of Brazil. Source: Tacarij...

Damages to the SMC coating was healed via heating, which triggered a two-step healing mechanism consisting of defect closure through a shape memory effect at 65 °C and then defect sealing by molten wax at 90 °C.

Key role of carnauba wax confirmed

The surface morphologies of the scratched and healed coatings as well as a wax-free SMP coating were first studied by optical stereomicroscopy and scanning electron microscopy (SEM). To assess the recovery of the coating’s barrier properties, macroscopic and localised information was obtained by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM), respectively. The healing performance was also evaluated by comparing the macroscopic morphologies of the intact, damaged and healed coatings after long-term immersion. The results from both tests were in agreement and confirmed the key roles of carnauba wax microparticles in the complete recovery of the barrier properties of initially damaged coatings upon thermally assisted self-healing.

The study is published in: Progress in Organic Coatings, Volume 97, August 2016, Pages 261–268

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