POS1-0211
High-Rate Responsive Polyborosiloxane with Exceptional Impact Stiffening and Energy Absorption for Impact Protection
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Yue Huang (College of Polymer Science and Engineering, Sichuan University)
Co-Author(s)
Abstract
Impact-stiffening polymers are attractive for adaptive protection because they remain compliant under normal conditions yet rapidly stiffen under impact. As a representative system, polyborosiloxane (PBS) has been widely explored for impact mitigation, but its further upgrading of stiffening efficiency and impact resistance remains limited due to the constraints of conventional molecular design. Herein, we develop a new type PBS through an unconventional structural engineering approach. This design simultaneously couples ambient-state softness and dimensional stability with rapid impact-triggered stiffening. Upon impact, the network forms transient reinforcing skeleton to bear the force, accompanied by efficient energy dissipation through reversible dissociation and reassociation. As a result, the newly developed PBS achieves a stiffening ratio of 8275, a relaxation time of only 47 ms, and an impact-force attenuation of up to 93% at a thickness of 0.3 mm. Under high strain-rate loading, it delivers a modulus of 2.95 GPa, a compressive strength of 47.1 MPa, and an energy-absorption capacity of 10.21 MJ/m3. Beyond bulk impact protection, this material can also function as an effective structural filler. This work provides a molecular-level strategy for engineering PBS-based adaptive protective materials with high-rate responsiveness and outstanding impact resistance.
