CN110567617B - 一种柔性压力传感器及其制备方法 - Google Patents
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
Abstract
本发明属于柔性导电高分子压力传感器技术领域，公开一种柔性压力传感器及其制备方法。步骤如下：按重量百分比，称取原料：聚醚嵌段酰胺80‑99.99%、石墨烯0.01‑20%；将聚醚嵌段酰胺和石墨烯加入转矩流变仪的混合室中，在温度140‑180℃、转速为60‑80 rpm条件下混合5‑10 min；混合样品在平板硫化机的模板上先140‑180℃预热10‑15 min，预热后再将样品在10‑15 MPa的压力下硫化至少4 min，即得柔性压力传感器。本发明制备的柔性压力传感器具有良好的灵敏度和传感稳定性，并且在循环加载稳定后具有良好的可恢复性和再现性，在压力传感中表现出良好的识别性。
Description
技术领域
本发明属于柔性导电高分子压力传感器技术领域，具体涉及一种柔性压力传感器及其制备方法。
背景技术
基于暴露于机械变形时电阻变化的压力传感器由于其广泛的应用（包括健康监测和运动检测）而吸引了很多关注。高灵敏度、良好的重现性和良好的加工性是满意的压力传感所必需的。最近，基于CPC（Conductive Polymer Composite，导电高分子复合材料）的传感器由于其在暴露于拉伸或压缩应变时的电阻变化的快速响应而被广泛研究。通常，基于CPC的传感器总是呈现正电压系数（PPC）的电阻效应，即CPC的电阻随着外部刺激压力的增加而增加。例如，热塑性聚氨酯（TPU）/石墨烯，环氧/CNT，聚丙烯/CNT，和TPU/碳纳米管（CNT）显示出良好的应变传感能力和PPC抗性效应。但是，上述CPC传感器还具有基质的有限拉伸性和不良填料-聚合物相互作用的缺点，因此，如何选择具有令人满意的拉伸性和出色加工性的合适聚合物基体对压力传感具有重要意义。
发明内容
本发明的目的在于提供一种柔性压力传感器及其制备方法。
为实现上述目的，本发明采取的技术方案如下：
一种柔性压力传感器的制备方法，步骤如下：
（1）、按重量百分比，称取原料：聚醚嵌段酰胺80-99.99%、石墨烯0.01-20%；
（2）、将聚醚嵌段酰胺和石墨烯加入转矩流变仪的混合室中，在温度140-180 ℃、转速为60-80 rpm条件下混合5-10 min；
（3）、混合样品在平板硫化机的模板上先140-180 ℃预热10-15 min，预热后再将样品在10-15 MPa的压力下硫化至少4 min，即得柔性压力传感器。
利用上述制备方法制备的柔性压力传感器。
有益效果：
（1）聚醚嵌段酰胺（PEBAX）是一种相对较新的热塑性弹性体，由聚酰胺嵌段（结晶硬链段）和聚醚嵌段（软链段）组成，本发明选择聚醚嵌段酰胺作为材料的基体，通过在聚合物基底中掺杂石墨烯使其具有导电性，改变材料的微观结构，构筑独特的表面形貌，使弹性材料能够将所承受的压力完全转化为弹性形变，并在外力消失时迅速释放弹性势能恢复原状；
（2）本发明制备方法采用易获取的原料，经过简单制备步骤即可得到具有快速响应性和高灵敏度的压力传感器，且制备过程中无需任何溶剂，操作简单，容易实施，易于工业化生产；
（3）本发明制备的柔性压力传感器具有良好的灵敏度和传感稳定性，并且在循环加载稳定后具有良好的可恢复性和再现性，在压力传感中表现出良好的识别性；本发明柔性压力传感器可用于穿戴足底压力测量、人体运动健康监测、带有压力传感器的枕头等，本发明柔性压力传感器还可用于电磁屏蔽材料等。
附图说明
图1：本发明制备的柔性压力传感器的实物图；
图2：柔性压力传感器循环负载5次，直至24.67KPa高压的电导率-压力行为。
具体实施方式
下面给出具体实施例以对本发明的技术方案作进一步说明，但是值得说明的是：以下实施例不能理解为对本发明保护范围的限制，本领域技术人员根据上述本发明的内容，对本发明作一些非本质性的改进和调整仍属于本发明的保护范围。
实施例1
一种柔性压力传感器的制备方法，步骤如下：
（1）、按重量百分比，称取原料：聚醚嵌段酰胺（PEBAX）99.5%、石墨烯0.5%；
（2）、将聚醚嵌段酰胺和石墨烯加入XSS-330转矩流变仪的混合室中，在混合温度175 ℃、转速为80 rpm条件下混合6 min；
（3）、混合样品在LN-50T平板硫化机的模板上先175 ℃预热10 min，预热后再将样品在15 MPa的压力下硫化4 min，即得柔性压力传感器。
实施例2
与实施例1的不同之处在于，原料配比为：聚醚嵌段酰胺（PEBAX）98%、石墨烯2%；其它同实施例1。
实施例3
与实施例1的不同之处在于，原料配比为：聚醚嵌段酰胺（PEBAX）95%、石墨烯5%；其它同实施例1。
实施例4
与实施例1的不同之处在于，原料配比为：聚醚嵌段酰胺（PEBAX）90%、石墨烯10%；其它同实施例1。
性能测试实验
利用PC68型高阻计（上海精密科学仪器有限公司）及与其配套的电极箱对实施例1-4所得柔性压力传感器分别测试其电导率随压力的变化，测试时打开电极箱顶部的盖子，直接在测量电极顶端添加不同重量的砝码来实现压力的变化。电导率随压力的变化结果如图2所示，发现：电导率的值随着压力的增加而逐渐增加，卸载后，电导率几乎恢复到初始水平，引起可逆现象。这是因为：对于原始的石墨烯导电网络，石墨烯导电网络的薄片-薄片连接在PEBAX中形成，当外部压力施加在样品上时，由于石墨烯的机械柔韧性，它沿着PEBAX链延伸和蠕变，导致形成更多的石墨烯-石墨烯接触，并减少导电石墨烯填料之间的隧道距离，同时，发生了一些破坏导电通路；导电网络的重建在加载过程中占主导地位，因此获得了增加的导电性；在卸载过程中，由于PEBAX具有出色的弹性，新的导电网络恢复到原始状态，引起可逆现象。
Claims (2)
1.一种柔性压力传感器的制备方法，其特征在于，步骤如下：
（1）、按重量百分比，称取原料：聚醚嵌段酰胺80-99.99%、石墨烯0.01-20%；
（2）、将聚醚嵌段酰胺和石墨烯加入转矩流变仪的混合室中，在温度140-180 ℃、转速为60-80 rpm条件下混合5-10 min；
（3）、混合样品在平板硫化机的模板上先140-180 ℃预热10-15 min，预热后再将样品在10-15 MPa的压力下硫化至少4 min，即得柔性压力传感器。
2.一种如权利要求1所述制备方法制备的柔性压力传感器。
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