Well-Defined ABA Triblock Copolymers Containing Carbazole and Ethynyl Groups: Living Anionic Polymerization, Postpolymerization Modification, and Thermal Cross-Linking

• Published in: Macromolecular research Vol. 29; no. 7; pp. 470 - 476
• Main Author: Kang, Beom-Goo
• Format: Journal Article
• Language: English
• Published: Seoul The Polymer Society of Korea 01.07.2021; Springer Nature B.V; 한국고분자학회
• Subjects: Anionic polymerization; Block copolymers; Carbazoles; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Copolymerization; Corrosion resistance; Crosslinking; Differential scanning calorimetry; Energy levels; Molecular orbitals; Nanochemistry; Nanotechnology; Physical Chemistry; Polymer Sciences; Polyvinyl carbazole; Soft and Granular Matter; Thermogravimetric analysis; 고분자공학; block copolymer; deprotection; carbazole group; ethynyl group; thermal cross-linking; anionic polymerization
• ISSN: 1598-5032; 2092-7673
• DOI: 10.1007/s13233-021-9061-0

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-P BAB ). A triblock copolymer containing carbazole and (trimethylsilyl)ethynyl groups (P BAB ) is first prepared using potassium naphthalenide in tetrahyrdofuran at −78 °C for 60 min. Well-controlled poly (A) and P BAB can be obtained under the conditions employed in this anionic block copolymerization. The well-defined d-P BAB with thermally cross-linkable ethynyl group is then prepared by the deprotection of the trimethylsilyl group from P BAB without side reactions. The thermal cross-linking behavior of d-P BAB is investigated using thermogravimetric analysis and differential scanning calorimetry. The d-P BAB is cross-linked under different conditions, and it is observed that the d-P BAB film heated at 250 °C 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-P BAB are estimated to be −5.09 and −1.57 eV, respectively.