title: Stretchable Polyurethane Sponge Scaffold Strengthened Shear Stiffening Polymer and Its Enhanced Safeguarding Performance.
abstract: A simple and scalable "dip and dry" method was developed for fabricating stretchable polyurethane sponge-based polymer composite with excellent shear stiffening effect, creep resisting and adhesion property. The stiffness of the composite was tunable, the storage modulus (G') could automatically increase 3 orders of magnitude with the increasing of shear frequency, and the G'max could reach to as high as 1.55 MPa. Importantly, the composite with ideal damping capacity reduced the impact force by 2 orders of magnitude even under 26 cycles of consecutive dynamic impact loading with no obvious mechanical degradation. Moreover, an enhancing mechanism was proposed and it was found the "B-O cross bond" and the entanglement of polymer chains were attributed to the shear stiffening characteristic. Finally, the excellent adhesion ability and hydrophobicity guarantee the composite with reliable mechanical performance and longer lifespan.
authors.affiliation: Department of Chemistry, University of Science and Technology of China (USTC) , Hefei 230026, P. R. China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, USTC , Hefei 230027, P. R. China.
authors.forename: Shouhu
authors.initials: S
authors.lastname: Xuan
authors.affiliation: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, USTC , Hefei 230027, P. R. China.
authors.forename: Yunpeng
authors.initials: Y
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, USTC , Hefei 230027, P. R. China.
authors.forename: Chenhui
authors.initials: C
authors.lastname: Xu
authors.affiliation: Department of Chemistry, University of Science and Technology of China (USTC) , Hefei 230026, P. R. China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Mao
authors.affiliation: Department of Chemistry, University of Science and Technology of China (USTC) , Hefei 230026, P. R. China.
authors.forename: Mei
authors.initials: M
authors.lastname: Liu
authors.affiliation: Department of Chemistry, University of Science and Technology of China (USTC) , Hefei 230026, P. R. China.
authors.forename: Linfeng
authors.initials: L
authors.lastname: Bai
authors.affiliation: Department of Chemistry, University of Science and Technology of China (USTC) , Hefei 230026, P. R. China.
authors.forename: Wanquan
authors.initials: W
authors.lastname: Jiang
authors.affiliation: CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, USTC , Hefei 230027, P. R. China.
authors.forename: Xinglong
authors.initials: X
authors.lastname: Gong
keywords: adhesion; energy dissipation; hydrophobicity; shear stiffening; stretchable polyurethane sponge