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Pre‐Stretched Double Network Polymer Films Based on Agarose and Polyacrylamide with Sensitive Humidity‐Responsive Deformation, Shape Memory, and Self‐Healing Properties
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-01-30 , DOI: 10.1002/macp.201900518 Yao Zhang 1 , Shuaifeng Zhou 1 , Lidong Zhang 1 , Qiwen Yan 1 , Lina Mao 1 , Yiqian Wu 1 , Wei Huang 1
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-01-30 , DOI: 10.1002/macp.201900518 Yao Zhang 1 , Shuaifeng Zhou 1 , Lidong Zhang 1 , Qiwen Yan 1 , Lina Mao 1 , Yiqian Wu 1 , Wei Huang 1
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A series of pre‐stretched double network (DN) polymer films based on agarose and polyacrylamide (Agar/PAM) are prepared. These films show the rapid and large deformation in response to humidity due to the release of contraction stress. The pre‐stretched dry film can curl toward the humidity direction into a scroll‐like structure in an extremely short time. The deformation direction can be also well controlled by the stretching direction. The released contraction stress increases with the increase of tensile strain. The DN Agar/PAM hydrogel film shows good water‐induced shape memory effect. It can be stretched to form various temporary shapes such as circle, square, and spiral. The shape fixing and recovery ratios are both close to 100%. The released large contraction stress accelerates the shape recovery process. The recovery time increases with the increase of film thickness. The DN dry film shows the good water‐induced self‐healing ability. The healed film maintains about 88% tensile strength (103 MPa) of the original film. Due to these good properties, the pre‐stretched DN dry films can be fabricated into a soft robot jack which can easily lift up to ≈20 times its own weight within 8 s.
中文翻译：
基于琼脂糖和聚丙烯酰胺的预拉伸双网络聚合物薄膜，具有敏感的湿度响应变形，形状记忆和自愈特性
制备了一系列基于琼脂糖和聚丙烯酰胺（Agar / PAM）的预拉伸双网络（DN）聚合物薄膜。这些薄膜由于收缩应力的释放而显示出对湿度的快速且大的变形。预拉伸的干膜可以在极短的时间内向湿度方向卷曲成卷状结构。变形方向也可以通过拉伸方向很好地控制。释放的收缩应力随着拉伸应变的增加而增加。DN Agar / PAM水凝胶膜显示出良好的水诱导形状记忆效果。可以拉伸它以形成各种临时形状，例如圆形，正方形和螺旋形。形状固定和回复率均接近100％。释放的大收缩应力加速了形状恢复过程。恢复时间随着膜厚度的增加而增加。DN干膜显示出良好的水诱导自修复能力。修复后的薄膜保持原始薄膜的约88％拉伸强度（103 MPa）。由于这些良好的性能，可以将预拉伸的DN干膜制成柔软的机械手千斤顶，该千斤顶可以很容易在8 s内升起约20倍于自身重量的重量。
更新日期：2020-01-30
中文翻译：
基于琼脂糖和聚丙烯酰胺的预拉伸双网络聚合物薄膜，具有敏感的湿度响应变形，形状记忆和自愈特性
制备了一系列基于琼脂糖和聚丙烯酰胺（Agar / PAM）的预拉伸双网络（DN）聚合物薄膜。这些薄膜由于收缩应力的释放而显示出对湿度的快速且大的变形。预拉伸的干膜可以在极短的时间内向湿度方向卷曲成卷状结构。变形方向也可以通过拉伸方向很好地控制。释放的收缩应力随着拉伸应变的增加而增加。DN Agar / PAM水凝胶膜显示出良好的水诱导形状记忆效果。可以拉伸它以形成各种临时形状，例如圆形，正方形和螺旋形。形状固定和回复率均接近100％。释放的大收缩应力加速了形状恢复过程。恢复时间随着膜厚度的增加而增加。DN干膜显示出良好的水诱导自修复能力。修复后的薄膜保持原始薄膜的约88％拉伸强度（103 MPa）。由于这些良好的性能，可以将预拉伸的DN干膜制成柔软的机械手千斤顶，该千斤顶可以很容易在8 s内升起约20倍于自身重量的重量。
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