Studies on nucleophilic aromatic substitution polymerization for advanced poly(biphenylene oxide)s containing ortho-bis(trifluoromethyl) groups = 오쏘-비스(트리플루오로메틸)그룹을 포함하는 향상된 폴리(바이페닐렌 옥사이드)의 친핵성 방향족 치환 중합에 대한 연구

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Poly(biphenylene oxide)s (PBPOs) containing two pendent trifluoromethyl groups were synthesized from AB-type monomers, 4’-hydroxy-4-fluoro-3,5-bis(trifluoromethyl)biphenyl and its 3’-hydroxyl isomer. The displacement reaction of fluorine leaving group activated by the two trifluoromethyl groups at the ortho-positions produced high-molecular-weight polymers with $M_n$ up to 101,000 g/mol, indicating the nucleophilic aromatic substitution reaction proceeded effectively. PBPOs with para-, meta-, and mixed ether linkages were obtained and well characterized by FTIR and $^1H/^{19}F$ NMR spectroscopies. All PBPOs were amorphous and soluble in a wide range of organic solvents, and exhibited even more enhanced thermal stability than the previously reported two meta-trifluoromethyl substituted analogues. Increasing the para-linkage fraction in the polymer generally improved solubility and increased $T_g$ in contrast to the meta-trifluoromethyl case, where para-linked polymer was poorly soluble and semicrystalline. This suggests that the ortho-trifluoromethyl substituents are more effective for the synthesis of para-linked PBPOs. They also showed low refractive indices and birefringence values.
Advisors
Lee, Hee-Seungresearcher이희승researcher
Description
한국과학기술원 :화학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학과, 2020.2,[iv, 33 p. :]

Keywords

Poly(biphenylene oxide)▼aPoly(biphenylene oxide)▼aTrifluoromethyl group▼aNucleophilic Aromatic Substitution reaction▼asoluble polymer; 폴리페닐렌옥사이드▼a폴리바이페닐렌옥사이드▼a트리플루오로메틸▼a방향족 친핵체 반응▼a용해성 고분자

URI
http://hdl.handle.net/10203/283851
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=909932&flag=dissertation
Appears in Collection
CH-Theses_Master(석사논문)
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