Extreme Tribological Characteristics of Copolymers Induced by Dynamic Rheological Instability AITranslate

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DOI：https://doi.org/10.1021/acsapm.1c00423

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Nonlinear tribological behavior of polymeric microparticles under extreme collision conditions is required for an in-depth understanding of advanced applications in the fields of defense, biomedicine, and manufacturing. Laser-induced projectile impact tests with an incidence angle of 45° are conducted to investigate the tribological response at the contact interface of block copolymers with glassy–rubbery phases and a stationary substrate to induce deformations with an ultrahigh strain rate. Morphological-phase-dependent tribological and rheological responses are quantified from the mechanical interactions involving adiabatic heating, plastic flow, and interfacial shear instability. An effective coefficient of friction mechanism that depends on the rheological transition activated by impact velocity is proposed to specify the rheological response of the copolymers.