Stretchable Polyurethane Sponge Scaffold Strengthened Shear Stiffening Polymer and Its Enhanced Safeguarding Performance

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• 作者：Sheng Wang ; Shouhu Xuan ; Yunpeng Wang ; Chenhui Xu ; Ya Mao ; Mei Liu ; Linfeng Bai ; Wanquan Jiang ; Xinglong Gong
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 24, 2016
• 年：2016
• 卷：8
• 期：7
• 页码：4946-4954
• 全文大小：547K
• ISSN：1944-8252

文摘

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.