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arXiv 1707.09077cond-mat.softcond-mat.mtrl-sci
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基于潜在交联的应变硬化凝胶

Strain-stiffening gels based on latent crosslinking

Yen H. Tran, Matthew J. Rasmuson, Todd S. Emrick, John Klier, Shelly R. Peyton

摘要:

凝胶是一类越来越重要的软材料,其应用范围从再生医学到商品材料。凝胶的一个主要缺点是它们的相对机械弱点,这在应变下会进一步恶化。我们报告了一类新的响应凝胶与潜在的交联部分,表现出应变硬化行为。这种性质是由二硫化物的不稳定性引起的,二硫化物最初以受保护的状态分离,然后按需活化交联。当受到机械压缩时,活性硫醇基团被诱导形成链间交联,从而产生在应变下增强的凝胶。分子屏蔽设计元素调节聚合物网络的应变敏感性和自发交联倾向。这些应变响应凝胶代表了具有按需硬化性能的新型先进材料的合理设计,在弹性体,粘合剂,泡沫,薄膜和纤维中具有潜在的应用。

英文摘要:

Gels are an increasingly important class of soft materials with applications ranging from regenerative medicine to commodity materials. A major drawback of gels is their relative mechanical weakness, which worsens further under strain. We report a new class of responsive gels with latent crosslinking moieties that exhibit strain-stiffening behavior. This property results from the lability of disulfides, initially isolated in a protected state, then activated to crosslink on-demand. The active thiol groups are induced to form inter-chain crosslinks when subjected to mechanical compression, resulting in a gel that strengthens under strain. Molecular shielding design elements regulate the strain-sensitivity and spontaneous crosslinking tendencies of the polymer network. These strain-responsive gels represent a rational design of new advanced materials with on-demand stiffening properties with potential applications in elastomers, adhesives, foams, films, and fibers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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