Stimuli-responsive transformation in carbon nanotube/expanding microsphere-polymer composites

被引:22
作者
Loomis, James [1 ]
Xu, Peng [1 ]
Panchapakesan, Balaji [1 ]
机构
[1] Univ Louisville, Small Syst Lab, Dept Mech Engn, Louisville, KY 40292 USA
基金
美国国家科学基金会;
关键词
NANOTUBE COMPOSITES; THERMOPLASTIC ELASTOMERS; GLASS-TRANSITION; ACTUATORS; NANOCOMPOSITES; FILMS; ADAPTRONICS; TEMPERATURE; RECOVERY;
D O I
10.1088/0957-4484/24/18/185703
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Our work introduces a class of stimuli-responsive expanding polymer composites with the ability to unidirectionally transform their physical dimensions, elastic modulus, density, and electrical resistance. Carbon nanotubes and core-shell acrylic microspheres were dispersed in polydimethylsiloxane, resulting in composites that exhibit a binary set of material properties. Upon thermal or infrared stimuli, the liquid cores encapsulated within the microspheres vaporize, expanding the surrounding shells and stretching the matrix. The microsphere expansion results in visible dimensional changes, regions of reduced polymeric chain mobility, nanotube tensioning, and overall elastic to plastic-like transformation of the composite. Here, we show composite transformations including macroscopic volume expansion (>500%), density reduction (>80%), and elastic modulus increase (>675%). Additionally, conductive nanotubes allow for remote expansion monitoring and exhibit distinct loading-dependent electrical responses. With the ability to pattern regions of tailorable expansion, strength, and electrical resistance into a single polymer skin, these composites present opportunities as structural and electrical building blocks in smart systems.
引用
收藏
页数:13
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