Publications
Detailed Information
A Study on Dielectric or Adsorption Properties of Network Polymers Containing Cyclotriphosphazene Rings
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 장지영 | - |
dc.contributor.author | 전희선 | - |
dc.date.accessioned | 2018-05-29T03:23:53Z | - |
dc.date.available | 2018-05-29T03:23:53Z | - |
dc.date.issued | 2018-02 | - |
dc.identifier.other | 000000149805 | - |
dc.identifier.uri | https://hdl.handle.net/10371/141472 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 공과대학 재료공학부, 2018. 2. 장지영. | - |
dc.description.abstract | Cyclotriphospazenes are cyclic compounds having alternate nitrogen and phosphorus atoms. With a diverse combination of two substituent groups attached to the phosphorous atoms, they can have a broad range of chemical and physical properties. In this study, reactive cyclotriphosphazene derivatives were synthesized and used for the preparation of functional materials.
Firstly, flame retardant and low dielectric epoxy resins based on cyclotriphosphazene were studied. Cyclotriphosphazenes having epoxy groups and 2-biphenol (B-PE), 4-phenylphenol (P-PE), and 2-naphtol (N-PE) as co-substituents were synthesized. Highly cross-linked polymers were obtained by thermal polymerization with an active ester type hardener and dimethylaminopyridine. The resulting epoxy polymers showed good thermal stability. The temperatures of 5% weight loss, measured by TGA, were above 300℃. The polymers having B-PE, P-PE, and N-PE as co-substituents showed low dielectric constants of about 2.192, 2.388, and 2.175 and low dielectric losses of about 6.08 * 10-3, 6.13 * 10-3, and 4.97 * 10-3 at 10 GHz, respectively. The flame-retardant property of the B-PE polymer was excellent, showing a very high LOI value of 31. Secondly, porous cyclophosphazene-based polymers were prepared by Friedel-Crafts alkylation reaction of a biphenol substituted cyclophosphazene and dichloroxylene or bis(chloromethyl)biphenyl. Dichloroxylene and bis(chloromethyl)biphenyl acted as linkers and the microporosities of the polymers were tuned by adjusting their molar ratios to the cyclotriphosphazene monomer. All PCPs showed large Brunauer-Emmett-Teller surface areas, hierarchical pore size distributions, and good CO2 uptake properties. | - |
dc.description.tableofcontents | ChapterI. 1
I-1.References 8 ChapterII. 10 II-1.Introduction 11 II-2.Experiment 13 II-3.Results and Discussion 19 II-3-1.Monomer Synthesis 19 II-3-2.Thermal Polymerization 22 II-3-3.Dielectric Properties 25 II-3-4.Flame Retardant Property 27 II-4.Conclusions 28 II-5.References 30 ChapterIII. 34 III-1.Introduction 35 III-2.Experiment 36 III-3.Results and Discussion 39 III-3-1.Monomer Synthesis and Polymerization 39 III-3-2.Properties of PCPs 43 III-4.Conclusions 47 III-5.References 48 Appendix 51 국문요약 54 | - |
dc.format | application/pdf | - |
dc.format.extent | 1229068 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | Cyclotriphosphazene | - |
dc.subject | epoxy | - |
dc.subject | low dielectric | - |
dc.subject | flame retardant | - |
dc.subject | microporous polymer | - |
dc.subject | carbon dioxide adsorption. | - |
dc.subject.ddc | 620.1 | - |
dc.title | A Study on Dielectric or Adsorption Properties of Network Polymers Containing Cyclotriphosphazene Rings | - |
dc.type | Thesis | - |
dc.description.degree | Master | - |
dc.contributor.affiliation | 공과대학 재료공학부 | - |
dc.date.awarded | 2018-02 | - |
- Appears in Collections:
- Files in This Item:
Item View & Download Count
Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.