聚N-羟乙基丙烯酰胺-明胶基水凝胶传感器的制备及性能
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泉州师范学院化工与材料学院

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福建省重大科技计划资助项目(2020HZ06019);福建省中青年教师教育科研项目(JAT190517);泉州师范学院引进人才科研启动经费(H19003,G16021)


Preparation and properties of pHEAA-gelatin-based hydrogel sensor
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    摘要:

    近年来,水凝胶在柔性可穿戴传感器领域展现出巨大的应用前景,但是如何通过简单高效的方法构建同时具有优异的拉伸性能、抗冻性能和粘附性能的水凝胶基传感器仍然具有挑战性。本文基于分子间的物理作用,采用简单高效“一锅法”,以聚N-羟乙基丙烯酰胺(PHEAA)和明胶(GE)作为水凝胶的基体材料,通过向凝胶前驱体溶液中加入氯化钠(NaCl)和乙二醇(EG)制备了PHEAA-GE-EG-NaCl水凝胶。利用万能拉力机(UTA)、红外光谱仪(FTIR)、差示扫描量热仪(DSC)、旋转流变仪(DHR)和电化学工作站对水凝胶进行结构和性能的表征。结果表明:PHEAA-GE-EG-NaCl水凝胶的拉伸应变是1567%;氯化钠(NaCl)和乙二醇(EG)的协同作用使PHEAA-GE-EG-NaCl水凝胶具有优异的抗冻性能,PHEAA-GE-EG-NaCl水凝胶在-30℃的拉伸应变和电导率分别高达558%和0.21S/m;同时,PHEAA-GE-EG-NaCl水凝胶对不同的基材(例如:玻璃、金属、纸、聚四氟乙烯等)都展现出优异的粘附性能;更为重要的是,PHEAA-GE-EG-NaCl水凝胶基应变传感器对大应变和小应变都具有优异的循环稳定性,能够在较宽的温度范围内(-30℃到25℃)稳定地检测人体大幅度的肢体运动和小幅度的生理信号;因此,PHEAA-GE-EG-NaCl水凝胶在柔性可穿戴传感器领域具有广泛的应用前景。

    Abstract:

    Recently, hydrogel has shown great application prospects in the field of flexible wearable sensor, but the simultaneous realization of remarkable tensile, anti-freezing and adhesion features via a facile method remains challenging. In this work, based on intermolecular physical interactions, poly(N-hydroxyethyl acrylamide) (PHEAA) and gelatin (GE) gel were employed to prepare PHEAA-GE-EG-NaCl hydrogel by adding sodium chloride (NaCl) and ethylene glycol (EG) into the gel precursor solution via a facile “one-pot” method. The universal tensile machine (UTA), fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), rotational rheometer (DHR) and electrochemical workstation were used to characterize the structure and properties of hydrogels. The results show the tensile strain of PHEAA-GE-EG-NaCl hydrogel is 1567%. Due to the presence of NaCl and ethylene glycol, the PHEAA-GE-EG-NaCl hydrogel possesses outstanding anti-freezing capability, it can maintain excellent stretchability (558%) and conductivity (0.21S/m) at -30°C. Meanwhile, PHEAA-GE-EG-NaCl hydrogel exhibits excellent adhesion property to different substrates such as glass, metal, paper, and polytetrafluoroethylene. More importantly, PHEAA-GE-EG-NaCl hydrogel-based strain sensor has excellent strain sensitivity and cyclic stability for both large strain and small strain, and it is capable of stably detecting and monitoring both large-scale human motions and subtle physiological signals in a wide temperature range (-30°C to 25°C). Therefore, PHEAA-GE-EG-NaCl hydrogel hydrogel holds promising potentials as wearable sensor.

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  • 收稿日期:2022-01-17
  • 最后修改日期:2022-03-29
  • 录用日期:2022-03-30
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