Study on Electromagnetic Properties of Sendust/MWCNTs/Polymer Composites
센더스트/다중벽 탄소나노튜브/폴리머 복합체의 전자기적 특성에 대한 연구

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dc.description학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2015. 2. 서용석.-
dc.description.abstractThis dissertation is about a study of making an electromagnetic wave absorption material that has high permeability and high permittivity. As a first step to make a hybrid composite that satisfy these two properties, a magnetic absorber (mixing Sendust with polymer) and a dielectric absorber (mixing MWCNTs with polymer) was made through melt mixing and solution mixing process. And to measure the permeability and permittivity of each absorber, vector network analyzer was used as a measurement tool.
The measurement results showed that the complex permeability and the electromagnetic wave absorption ability of a magnetic absorber increased in two conditions: when more amount of Sendsut was mixed and by using flake shape Sendust instead of bulk shape. While the complex permittivity and the electromagnetic wave absorption ability of a dielectric absorber proportionated to the weight ratio of MWCNTs.
Sendust/MWCNTs/polymer composites were created in order to make an electromagnetic wave absorption material as initially planned. We challenged to make the best hybrid composite that could gratify the conditions of preserving high permeability and high permittivity by changing the proportion of filler. In order to get a fixed permeability value contain of Sudust was fixed to 100 phr and 3 composites were made by adjusting the amount of MWCNTs to 5 phr, 10 phr and 15 phr. The result showed that the complex permittivity and the power loss increases as more filler was mixed but this was not promising because there was great reduction of reflection loss. The most realistic and effective hybrid composite was the composite with 5 phr of MWCNTs which was lighter and had excellent electromagnetic wave absorption with only 16 dB at a 4.6 GHz frequency.
dc.description.tableofcontentsChapterⅠ. Introduction
I-1. Electromagnetic interference (EMI) shielding
I-2. Materials for absorption of electromagnetic waves
I-2.1. Dielectric Absorption Material
I-2.2. Magnetic Absorption Materials
I-3. The Purpose of the Experiment

ChapterⅡ. Experimental Section
II-1. Materials
II-2. Sample preparation Process
II-2.1. Fabrication of Sendust/polymer composites
II-2.2. Fabrication of MWCNTs/polymer composites
II-2.3. Fabrication of MWCNTs/Sendust/polymer composite
II-3. Measurement of Electromagnetic Properties

ChapterⅢ. Results and Discussion
III-1. Electromagnetic Properties of Sendust/Polymer Composites
III-2. Electromagnetic Properties of MWCNTs/Polymer Composites
III-3. Electromagnetic Properties o Sendust/MWCNTs/Polymer Composites

Chapter Ⅳ. Conclusion
dc.format.extent4029644 bytes-
dc.publisher서울대학교 대학원-
dc.subjectMulti-walled carbon nanotube-
dc.subjectElectromagnetic wave-
dc.subjectEMI absorber-
dc.subjectElectromagnetic properties-
dc.titleStudy on Electromagnetic Properties of Sendust/MWCNTs/Polymer Composites-
dc.title.alternative센더스트/다중벽 탄소나노튜브/폴리머 복합체의 전자기적 특성에 대한 연구-
dc.contributor.AlternativeAuthorPark Seong-Eun-
dc.citation.pagesviii, 65-
dc.contributor.affiliation공과대학 재료공학부-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Theses (Master's Degree_재료공학부)
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