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[单选题]
导电橡胶可以将被测压力的变化转化为()
A
电阻变化b.电感变化c.电容变化d.电荷量的变化
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试题答案:
A
答案解释:
掺入导电填料的胶体基本可以看作是一个电阻R,在胶体不受力的情况下,材料中的导电粒子彼此不接触,颗粒间存在聚合物隔离层,使导电颗粒中自由电子的定向运动收到阻碍,电流无法通过。当胶体受力时,导电粒子被迫彼此接近,从而形成导电粒子网络,并表现出导电性。随着外力变化,胶体中导电粒子的分布也发生改变,从而改变材料的电阻R,使这种导电胶体表现出压力-电阻特性。
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