摘要
受自然界中植物形变原理的启示,将仿生不对称结构和形状记忆聚合物结合,探索制备具有复杂形变功能的新型仿生材料。研究利用光热转换特性,在透明的形状记忆Nafion膜表面采用黑色染料构筑图案化表面,在均匀近红外光照射下诱导出具有空间分布特点的温度场,引发局部形状回复,调控材料的复杂形变过程。该方法可通过简单的实验设计获得具有稳定结构的光诱导的复杂形变材料。与此同时,该图案化形状记忆材料的形变和表面图案均可以通过有机溶剂及后续退火过程擦除,因此,该方法可成功实现形变信息的写入,存储,显示,擦除的循环,并有望进一步发展成为一种非电子操控式的信息处理平台。
Spatially nonuniform stresses induced shape deformations represent a powerful tool to fabricate“four dimensional(4D)materials”,which are featured by shape changes on the time scale.Previous experimental methods,however,mainly focus on reversible shape shifts,restricting the applications in the fields of biomedical implants,electronic devices,etc.More importantly,most of these methods suffer from difficulties in reshaping,since the geometric information is defined permanently.Herein,a new kind of self-shaping materials is described to offer both stable three dimensional(3D)shapes and shape reprogrammability by creatively fusing the superiorities of the shape memory polymers and the internal stress induced shape deformations.A pre-strained shape memory polymer Nafion,which was optically transparent,was chosen as the substrate.Black patterns“painted”on the substrate offered spatially heterogeneous light absorption,which heated the substrate locally.As a result,the fabricated materials afforded complicated yet predictable 3D shape transitions.More impressively,the painted patterns and the obtained 3D shapes could be erased by immersion in ethanol and heating,which demonstrated that the materials could be reprogrammed to afford different deformations.
作者
陈婷珽
计冲
王珺
金桥
CHEN Tingting;JI Chong;WANG Jun;JIN Qiao(MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China;Zhejiang Hangzhou High School,Hangzhou 310003,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2018年第10期1-5,共5页
Journal of Functional Materials
基金
国家自然科学基金重点资助项目(51333005).
关键词
形状记忆聚合物
光热转化
复杂形变
二次图案化
内应力
shape memory polymers
photothermal conversion
three dimensional shape transitions
shape reprogrammability
internal stresses
