This paper studies the conductivity of poly (lactic acid) (PLA)/poly (ethylene oxide) (PEO)/carbon nanotubes (CNT) nanocomposites during degradation in neutral phosphate-buffered saline (PBS) solution by experimental and modeling results. PLA/PEO/CNT nanocomposites are prepared and the conductivity of samples is measured before and during degradation. This system can be applied as a degradation nanobiosensor, because the variation of conductivity expresses the extent of degradation. A simple model is developed to predict the variation of conductivity during hydrolytic degradation. The degradation of polymers improves the effectiveness of CNT networks in the samples growing the conductivity. The proper agreement between experimental and theoretical results approves the validity of the developed model. A longer degradation time destroys more polymer chains shortening the tunneling space between CNT. The percolation threshold increases during degradation, due to the degradation of interphase zones between polymer and CNT. The calculations demonstrate that the fraction of networked CNT decreases during degradation, because PBS solution attacks the CNT networks. These reasonable predictions validate the developed equations representing the variations of conductivity, tunneling distance, percolation threshold and the fraction of networked CNT in the samples during degradation.

本文通过实验和建模结果研究了聚乳酸（PLA）/聚环氧乙烷（PEO）/碳纳米管（CNT）纳米复合材料在中性磷酸盐缓冲盐水（PBS）溶液降解过程中的电导率。制备了PLA / PEO / CNT纳米复合材料，并在降解之前和降解过程中测量了样品的电导率。该系统可以用作降解纳米生物传感器，因为电导率的变化表示降解的程度。开发了一个简单的模型来预测水解降解过程中电导率的变化。聚合物的降解提高了提高导电性的样品中CNT网络的有效性。实验结果和理论结果之间的适当一致性证明了所开发模型的有效性。较长的降解时间会破坏更多的聚合物链，从而缩短CNT之间的隧穿空间。由于聚合物和CNT之间的相间区的降解，在渗透过程中渗透阈值增加。计算结果表明，由于PBS溶液攻击CNT网络，网络化CNT的比例在降解过程中降低。这些合理的预测验证了所开发的方程式，这些方程式代表了降解过程中样品中电导率，隧穿距离，渗滤阈值和网状CNT的分数的变化。因为PBS解决方案会攻击CNT网络。这些合理的预测验证了所开发的方程式，这些方程式代表了降解过程中样品中电导率，隧穿距离，渗滤阈值和网状CNT的分数的变化。因为PBS解决方案会攻击CNT网络。这些合理的预测验证了所开发的方程式，这些方程式代表了降解过程中样品中电导率，隧穿距离，渗滤阈值和网状CNT的分数的变化。