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Preparation and Electrical Properties of PI/MWNTs Nano-hybrid Films

Author: DiaoPengHe
Tutor: ZhangMingYan
School: Harbin University of Science and Technology
Course: Polymer Chemistry and Physics
Keywords: Polyimide Multi-walled carbon nanotubes Hybrid Films Electrical properties
CLC: TB383.2
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
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Abstract


Polyimide (PI) as a high-performance engineering materials , has excellent physical and chemical properties in a wide temperature range , can be widely applied in the fields of aviation / aerospace , electrical / electronic . Over the past decade, to meet the various fields of higher PI material performance requirements , the domestic and foreign scholars with various types of inorganic nanoparticles component modified PI compared with other inorganic nanoparticles , carbon nanotubes (MWNTs) have a great many excellent properties of the aspect ratio, high strength , one-dimensional conductivity, high thermal conductivity, etc. , become modified PI's in recent years , research hotspot . Paper to be adopted MWNTs PI modified , using two methods of the different aspect ratios of MWNTs functionalizing treatment , and the function of MWNTs uniformly dispersed in a solvent of N , N - dimethyl acetamide (DMAc) in MWNTs DMAc solution generated in situ hybridization were benzene polyamic acid glue , and then the glass cast film formation , After gradually warming thermal imidization , three series of PI / MWNTs nanohybrid film . This article on hybrid thin film surface and cross section were used to characterize the electrical properties of the hybrid films were analyzed . The study results showed that : MWNTs functional processing to improve its dispersibility in a solution and the hybrid films , enhanced compatibility with the PI matrix . Doping amount is less than 0.7wt% , three hybrid film resistance corona time with the doping amount of increase in the first elevated and then decreased system A corona resistant up to 7.75h system B 5.75h, C system for 9.5h; doping amount is less than 5wt% , the dielectric constant of the hybrid films becomes large with the increase in the amount of MWNTs doped , in the frequency range of 10 ~ 2Hz ~ 10 ~ 6Hz with frequency increases and decreases; doping amount is less than 0.56wt% , the dielectric loss of the hybrid films increased with increasing frequency in the frequency range of 10 ~ 2Hz ~ 10 ~ 6Hz , as the doping amount of the improvement system A dielectric becomes large ; doping amount is less than 1.5wt% , the three systems hybrid showed a decreasing trend of the dielectric strength of the film with the improvement of MWNTs doping amount , the same doping amount , minimum intensity , C system . MWNTs introduction of PI film corona resistance improvement of hybrid thin film dielectric constant and dielectric loss and dielectric strength of regularity .

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