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폴리에테르이미드 용융중합 공정개선을 위한 신규 디아민 합성 및 중합
서완기(Wan Gi Seo),박노균(No Kyun Park),정유리(Yuri Jeong),김호섭(Ho Sub Kim),김상균(Sang Kyun Kim),손영교(Young Kyo Son),송상민(Sang Min Song),김윤호(Yun Ho Kim),원종찬(Jong Chan Won) 한국고분자학회 2020 폴리머 Vol.44 No.2
Melt process of polyetherimide (PEI) has a difficulty to precisely control mixing ratio of monomers, which results in failure of production on an industrial scale. Especially, a typical diamine monomer obstructs the feeder of the hot extruder due to its low melting point (mp) of 64℃. In this work, we suggest that a novel diamine monomer, DABI, can be substituted for the conventional monomer. The molecular structure of DABI was designed with the A-B-A structure with amide linkage, where A was m-PDA and B was BPADA, and was identified by structural analysis (1H NMR and FTIR). DABI showed a high yield of 98% in synthesis process and a high mp of 152℃ in thermal analysis (DSC). Finally, we obtain high molecular weight of PEI via melt process with DABI, which indicates that DABI can solve the problem with imbalance in the mixing ratio in melt process.