Well-Defined ABA Triblock Copolymers Containing Carbazole and Ethynyl Groups: Living Anionic Polymerization, Postpolymerization Modification, and Thermal Cross-LinkingWell-Defined ABA Triblock Copolymers Containing Carbazole and Ethynyl Groups: Living Anionic Polymerization, Postpolymerization Modification, and Thermal Cross-Linking
- Other Titles
- Well-Defined ABA Triblock Copolymers Containing Carbazole and Ethynyl Groups: Living Anionic Polymerization, Postpolymerization Modification, and Thermal Cross-Linking
- Authors
- 강범구
- Issue Date
- Jul-2021
- Publisher
- 한국고분자학회
- Keywords
- anionic polymerization; block copolymer; carbazole group; ethynyl group; deprotection; thermal cross-linking.
- Citation
- Macromolecular Research, v.29, no.7, pp.470 - 476
- Journal Title
- Macromolecular Research
- Volume
- 29
- Number
- 7
- Start Page
- 470
- End Page
- 476
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/41060
- DOI
- 10.1007/s13233-021-9061-0
- ISSN
- 1598-5032
- Abstract
- A block copolymer that can be thermally cross-linked is synthesized by copolymerization of N-phenyl-2-vinylcarbazole (A) and trimethyl(2-(4-vinylphenyl) ethynyl)silane (B), followed by a deprotection reaction (d-PBAB). A t riblock copolymer containing carbazole and (trimethylsilyl)ethynyl groups (PBAB) is first prepared using potassium naphthalenide in tetrahyrdofuran at -78℃for 60 min.
Well-controlled poly(A) and PBAB can be obtained under the conditions employed in this anionic block copolymerization. The well-defined d-PBAB with thermally cross-linkable ethynyl group is then prepared by the deprotection of the trimethylsilyl group from PBAB without side reactions. The thermal cross-linking behavior of d-PBAB is investigated using thermogravimetric analysis and differential scanning calorimetry. The d-PBAB is cross-linked under different conditions, and it is observed that the d-PBAB film heated at 250℃for 60 min shows excellent solvent resistance and increased film density. In addition, the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels of cross-linked d-PBAB are estimated to be -5.09 and -1.57 eV, respectively.
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