- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Hexahedral LED Arrays with Row and Column Control Lines Formed by Selective Liquid-Phase Plasticization and Nondisruptive Tucking-Based Origami
摘要： Origami/kirigami of flexible electronics is a promising way to produce 3D electronics because well-developed silicon-based technologies can be used for the planar circuitry layout. However, it is still a challenge to enable general row and column control lines to develop 3D addressable sensory and display systems. This study addresses this issue via selective plasticization of an acrylonitrile butadiene styrene (ABS) film with N,N-dimethylformamide (DMF) through polydimethylsiloxane (PDMS) microfluidic channels. The use of DMF provides plasticization in a controllable manner because of the fast absorption of the DMF in the liquid phase during the plasticization process, a prolonged retention time of DMF in the ABS film at room temperature during the transformation process, and fast desorption at 60–80 °C for the deplasticization process. The use of microfluidic channels allows high-resolution selective plasticization to enable extreme cases of local bending or even folding inward and outward, thereby enabling tucking-based origami with no crack generation. The lamination of membrane-type electronic devices to an ABS film followed by selective plasticization and transformation enables nondisruptive tucking-based origami at the electronics level, such as for the demonstration of a hexahedral light-emitting diode (LED) array with general row and column control lines.
关键词： tucking-based origami,plasticization,microchannel,3D electronics,flexible electronics
更新于2025-09-23 15:19:57
-
Moisture absorption and hydrothermal aging of phenylethynyl-terminated pyromellitic dianhydride-type asymmetric polyimide and composites
摘要： The effects of moisture on a polymerized monomeric reactant (PMR)-type polyimide (TriA X) and associated composites were investigated. Water uptake tests were performed on the polyimide at various temperatures and relative humidity levels to investigate moisture absorption behavior. Two-stage moisture absorption was observed, in which the first stage was diffusion controlled, whereas the second stage was moisture plasticization controlled. As exposure temperature increased, the equilibrium moisture content of the polyimide decreased, indicating an exothermic absorption process. The Arrhenius temperature dependence and moisture saturation as functions of temperature and humidity in the neat polymer were determined using curve fitting based on the published mathematical models. Long-term hydrothermal aging at 95°C was conducted on the neat polyimide and associated carbon fiber composites. Reversible hydrolytic reactions and a trace of irreversible hydrolysis were observed in the long-term exposure. The tensile ductility of the neat polyimide and the short-beam shear strength of the composites decreased with increasing aging time, while the tensile strength and modulus and thermal properties of the polyimide exhibited little change after 2000-h aging, demonstrating hydrothermal stability. The decrease in the ductility of the neat polymer after long-term moisture exposure was attributed to the network structure change, driven by hydrolysis and moisture plasticization.
关键词： β-relaxation,hydrothermal aging,moisture absorption,thermal properties,hydrolysis,Polyimide,composite,mechanical properties,plasticization
更新于2025-09-04 15:30:14