Dual‐Crosslink Physical Hydrogels with High Toughness Based on Synergistic Hydrogen Bonding and Hydrophobic Interactions,Macromolecular Rapid Communications

当前位置： X-MOL 学术 › Macromol. Rapid Commun. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Dual‐Crosslink Physical Hydrogels with High Toughness Based on Synergistic Hydrogen Bonding and Hydrophobic Interactions
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2018-01-31 , DOI: 10.1002/marc.201700806
Xiaohua Chang ₁ , Yuhui Geng ₁ , Heqing Cao ₁ , Jian Zhou ₁ , Ye Tian ₂ , Guorong Shan ₁ , Yongzhong Bao ₁ , Zi Liang Wu ₂ , Pengju Pan ₁

Affiliation

Constructing dual or multiple noncovalent crosslinks is highly effective to improve the mechanical and stimuli‐responsive properties of supramolecular physical hydrogels, due to the synergistic effects of different noncovalent bonds. Herein, a series of tough physical hydrogels are prepared by solution casting and subsequently swelling the films of poly(ureidopyrimidone methacrylate‐co‐stearyl acrylate‐co‐acrylic acid). The hydrophobic interactions between crystallizable alkyl chains and the quadruple hydrogen bonds between ureidopyrimidone (UPy) motifs serve as the dual crosslinks of hydrogels. Synergistic effects between the hydrophobic interactions and hydrogen bonds render the hydrogels excellent mechanical properties, with tensile breaking stress up to 4.6 MPa and breaking strain up to 680%. The UPy motifs promote the crystallization of alkyl chains and the hydrophobic alkyl chains also stabilize UPy–UPy hydrogen bonding. The resultant hydrogels are responsive to multiple external stimuli, such as temperature, pH, and ion; therefore, they show the thermal‐induced dual and metal ion‐induced triple shape memory behaviors.

中文翻译：

基于协同氢键和疏水相互作用的高韧性双交联物理水凝胶

由于不同的非共价键的协同作用，构造双或多个非共价交联键可非常有效地改善超分子物理水凝胶的机械和刺激响应特性。此处，一系列强硬物理凝胶的是通过溶液流延制得，并随后溶胀聚膜（脲基嘧啶丙烯酸甲酯-共-stearyl丙烯酸酯-共-丙烯酸）。可结晶烷基链与脲基嘧啶酮（UPy）基序之间的四个氢键之间的疏水相互作用充当水凝胶的双重交联。疏水相互作用和氢键之间的协同作用使水凝胶具有出色的机械性能，拉伸断裂应力高达4.6 MPa，断裂应变高达680％。UPy基序可促进烷基链的结晶，而疏水性烷基链也可稳定UPy–UPy氢键。生成的水凝胶对多种外部刺激（例如温度，pH和离子）有反应；因此，它们显示了热诱导的双重和金属离子诱导的三重形状记忆行为。

更新日期：2018-01-31

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11