Stretchable Polyurethane Sponge Scaffold Strengthened Shear Stiffening Polymer and Its Enhanced Safeguarding Performance
Stretchable Polyurethane Sponge Scaffold Strengthened Shear Stiffening Polymer and Its Enhanced Safeguarding Performance
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可拉伸聚氨酯海绵支架增强抗剪聚合物及其增强防护性能
DOI：
10.1021/acsami.5b12083
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发表时间：
2016
影响因子：
9.5
通讯作者：
Gong Xinglong
中科院分区：
文献类型：
--
作者：
Wang Sheng;Xuan Shouhu;Wang Yunpeng;Xu Chenhui;Mao Ya;Liu Mei;Bai Linfeng;Jiang Wanquan;Gong Xinglong
开发了一种简单且可扩展的“浸渍和干燥”方法，用于制造具有优异的剪切硬化效果、抗蠕变性和粘合性能的可拉伸聚氨酯海绵基聚合物复合材料。复合材料的刚度可调，储能模量（G'）随着剪切频率的增加自动增加3个数量级，G'max高达1.55 MPa。重要的是，具有理想阻尼能力的复合材料即使在连续26个循环的动态冲击载荷下，冲击力也降低了2个数量级，且没有明显的机械退化。此外，还提出了一种增强机制，发现“B-O交叉键”和聚合物链的缠结归因于剪切硬化特性。最后，优异的粘附能力和疏水性保证了复合材料具有可靠的机械性能和更长的使用寿命。
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 theG′maxcould 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.