Dielectric elastomers (DEs) as one class of electronic type of electroactive polymers (EAPs) can be deformed under electrical stimulation, and have important applications in the soft robots , wearable electronic devices, and medical rehabilitation machinery so on. In this work, the bending actuation mechanism, and electromechanical properties of nanostructured dielectric poly (styrene-b-(ethylene-co-butylene)-b-styrene)/white mineral oil (SEBS/WO) blend films were investigated under free electrodes condition. The morphology and mechanical properties of SEBS/WO films were adjusted by the content of WO, where the WO selectively swelled the poly (ethylene-co-butylene) (PEB) domains. The phase transition of lamellar (LAM) structure to hexagonal array packed cylinder (HEX) of SEBS/WO films was observed when added WO content larger than 17 wt%. The modulus and the polystyrene (PS) domain radius of SEBS/WO blend films with HEX structure were decreased as increase of WO weight fraction. The bending displacement of SEBS/WO films was almost linearly dependent on the applied electric voltages, and the single cantilever model based calculated bending force was almost linearly dependent on inverse of PS domain radius for SEBS/WO films with HEX morphology. The bending actuation mechanism of SEBS/WO films with HEX morphology was suggested that the bending actuation of SEBS/WO films was caused by electrostatic attraction force between inter-PS domains induced squeezing deformation of poly (ethylene-co-butylene) (PEB) domains. The SEBS/WO blend films with 50 wt% of WO content showed 6.54 mm (corresponding to 23.56°) at 2 kV (50 V/mm of nominal electric field). Our results can provide new insight on development of nanostructured electroactive elastomers for applications in the soft actuator materials.
Ying Lei,Jianyang Zhang,Haoquan Zhuang,Tao Yin,Pengcheng Lin
High-power consumption causes excessive heat of 5G devices, compromising performance and lifespan. Phase change materials (PCMs) enable passive, constant-temperature thermal management but suffer from leakage and low thermal conductivity, limiting their application. In this work, a strategy of heat transfer enhancement in thermal energy storage gels by size engineering of boron nitride (BN) towards 5G thermal management is proposed. Specifically, tetradecanol (TD), whose thermal storage temperature is close to the thermal management temperature of electronic devices, is selected as the working medium. Based on the van der Waals force and hydrogen bond between TD and styrene-ethylene-butylene-styrene (SEBS), TD@SEBS@BN gels (TSBGs) with suppressed leakage are formed. The enthalpy of the TSBG is as high as 128.12 J g −1 , stably storing heat at around 35.84°C. The synergistic enhancement of heat transfer of TSBGs by large/small-sized BN is studied. An efficient heat transfer network has been established by coupling large-sized BN (average 30 μm) and small-sized BN (average 1 μm). The thermal conductivity of TSBG is increased from 0.304 W m −1 K −1 to a high value of 0.966 W m −1 K −1 (an increase of 317.76%). The efficient thermal management of 5G electronic components is finally realized using TSBGs.
Yunpeng Huang,Xi Lin,Yidong Peng,Jiancheng Dong,Shili Xiao,Tianxi Liu
The rapid development of wearable electronics has driven demand for flexible, multifunctional fiber-based materials that can enable real-time physiological monitoring and adaptive responses. We report the design and fabrication of a core-sheath structured, dual-responsive fiber sensor featuring a conductive core and a thermochromic sheath via coaxial wet-spinning. The core comprises a conductive styrene-ethylene-butylene-styrene/carbon nanotubes-Ti 3 C 2 T x (SEBS/CNTs-Ti 3 C 2 T x ) composite optimized for strain sensing, while the sheath incorporates thermochromic microcapsules (TMs) within a SEBS matrix for temperature sensitivity. This integrated architecture enables simultaneous and independent detection of mechanical deformation and thermal variation, which demonstrates sharp and reversible color transitions within a 25–40 °C range, offering visual feedback to physiological temperatures. Furthermore, the conductive CNTs-Ti 3 C 2 T x hybrid network within the core facilitates sensitive strain-resistance behavior, with a maximum gauge factor of 214 at 100 % strain and reliable electromechanical performance over 3000 cycles. When applied to joints and vital regions (e.g., wrist, throat, knees), the fibers provide stable and high-fidelity signals during motion, pulse detection, and vocalization. Collectively, the integrated mechanical compliance, thermal responsiveness, and strain-sensing capacity position these fibers as promising candidates for next-generation wearable electronic systems, enabling smart diagnostics, physiological monitoring, and adaptive interfacing.
危险品化学品经营许可证（带存储）