**4. Conclusions**

In this chapter, nano-composite polyimide films with different amounts of Al2O3 are prepared by in-situ polymerization. PI films with and without surface molecular modification are prepared. Based on the DC corona method and PEA method, the surface charge and space charge dynamic of the sample were analyzed. The main research results obtained are as follows:


*Effect of Molecular Structure Modification and Nano-Doping on Charge Transportation… DOI: http://dx.doi.org/10.5772/intechopen.92024*
