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Study on Properties of High Dielectric Constant Inductor/Polymer Composites Based on Microwave Technology

Author: ChangJianFei
Tutor: GuZuoJuan
School: Suzhou University
Course: Materials Science
Keywords: carbon nanotube expanded graphite sheets microwave curing dielectricproperties
CLC: TB33
Type: Master's thesis
Year: 2012
Downloads: 92
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Abstract


High dielectric constant (K value) materials have been widely applied in many fields such as information, electronics, and bio-engineering. As we have known, most investigations of high-K composites focus on how to improve the dispersion of function particles in the polymer matrix, and chemical (covalent) methods are the most commonly used way to improve the dispersion. But the method would destroy structures of functional particles and thus reduced electrical properties. How to achieve good dispersion without reducing electrical properties of function particles during preparing high-K composites, it is a very important problem to be solved now. In this thesis, we focus on improving the technology, MWCNT/EP composites and EG/EP composites were prepared by microwave curing and thermal curing respectively. The electrical properties and dielectric properties of the composites were systematic studied, and some interesting and important phenomena were found.During the research of MWCNT/EP composite, we found that the dispersion of MWCNTs in microwave curing composites is better than that in thermal curing composites. The key to the success of this process would be the dispersion of the MWCNTs in the monomer followed by rapid curing before the MWCNTs agglomerate, because the curing time of microwave curing is much shorter than thermal curing. And we also found that a certain degree of orientation of MWCNTs due to the electric and magnetic fields of the microwave. Better dispersion and a certain degree of orientation make MWCNTs in composite more difficult to form a conductive network, therefore, With the same content of MWCNTs, m-MWCNT/EP composites show a much higher dielectric constant and lower dielectric loss than t-MWCNT/EP composites. Specifically, the dielectric constant and loss at100Hz ofm-MWCNT/EP composite with0.04vol%MWCNTs are about2.5and0.05times the corresponding value of t-MWCNT/EP composites, respectively.During the research of EG/EP composite, we found EG in m-EG/EP composite more difficult to form a conductive network, due to the better dispersion of EG in m-EG/EP composite, therefore, With the same content of EG, m-EG/EP composites show a much higher dielectric constant and lower dielectric loss than t-EG/EP composites. In addition, microwave curing can make composites to achieve the strong intercalation of EG in epoxy resin, and m-EG/EP composites exhibit better thermal resistant than t-EG/EP composites, showing the higher glass transition temperature. At last, the new process consisting of vacuum technique and microwave curing is easy to achieve a good dispersion of EG in composites without using any solvents.There are several innovations in this paper, the relation of the dielectric properties of m-MWCNT/EP composite and microwave curing was first revealed. Second, m-EG/EP composite materials were prepared and discussed their unique dielectric properties first, and the last a new process consisting of vacuum technique and microwave curing which is easy to achieve a good dispersion of EG in composites without using any solvents was found first. In summary, microwave curing has a great impact on the dielectric properties of material, and the high-K composites with a higher dielectric constant and lower dielectric loss can be prepared by microwave curing.

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