caa a22 4500 475765052 CHVBK 20180406123603.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1007/s003960000352 doi (NATIONALLICENCE)springer-10.1007/s003960000352 Synthesis and properties of poly(amide-imide)s containing a N -methylcarbazole group [Elektronische Daten] [C.-P. Yang, R.-S. Chen, C.-C. Chang] A new dicarboxylic acid monomer containing the N-methylcarbazole and imide structures, 3,6-bis(trimellitimido)-N-methylcarbazole (I), was prepared from the condensation of 3,6-diamino-N-methylcarbazole (c) and trimellitic anhydride. The diamine c was synthesized in three steps starting from the methylation of carbazole, followed by nitration and catalytic hydrazine reduction. A series of N-methylcarbazole-containing poly(amide-imide)s were synthesized by direct polycondensation from the diimide-diacid I with various aromatic diamines. These poly(amide-imide)s had inherent viscosities of 0.66-1.47 dl/g and were readily soluble in a variety of organic solvents, including N-methyl-2-pyrrolidone and N,N-dimethylacetamide (DMAc). Transparent, flexible, and tough films of these polymers could be cast from DMAc solutions, and these films exhibited excellent mechanical strength. The glass-transition temperatures of these poly(amide-imide)s were in the range 317-362 °C. All the poly (amide-imide) did not degrade noticeably below 480 °C in nitrogen, and the 10% weight loss temperatures and char yields at 800 °C were above 520 °C and 60% in nitrogen, respectively, indicating high thermal stability. Springer-Verlag Berlin Heidelberg, 2000 Key words Poly(amide-imide) nationallicence 3,6-Bis(trimellitimido)-N-methylcarbazole nationallicence 3,6-Diamino-N-methylcarbazole nationallicence Thermal stability nationallicence Yang C.-P Department of Chemical Engineering Tatung University 40 Chungshan North Road Section 3, Taipei 104, Taiwan e-mail: cpyang@ttu.edu.tw Tel.: +886-2-25925252 ext. 2977 Fax: +886-2-25861939, TW aut Chen R.-S Department of Chemical Engineering Tatung University 40 Chungshan North Road Section 3, Taipei 104, Taiwan e-mail: cpyang@ttu.edu.tw Tel.: +886-2-25925252 ext. 2977 Fax: +886-2-25861939, TW aut Chang C.-C Department of Chemical Engineering Tatung University 40 Chungshan North Road Section 3, Taipei 104, Taiwan e-mail: cpyang@ttu.edu.tw Tel.: +886-2-25925252 ext. 2977 Fax: +886-2-25861939, TW aut https://doi.org/10.1007/s003960000352 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000352 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang C.-P Department of Chemical Engineering Tatung University 40 Chungshan North Road Section 3, Taipei 104, Taiwan e-mail: cpyang@ttu.edu.tw Tel.: +886-2-25925252 ext. 2977 Fax: +886-2-25861939, TW aut NATIONALLICENCE 700 1- Chen R.-S Department of Chemical Engineering Tatung University 40 Chungshan North Road Section 3, Taipei 104, Taiwan e-mail: cpyang@ttu.edu.tw Tel.: +886-2-25925252 ext. 2977 Fax: +886-2-25861939, TW aut NATIONALLICENCE 700 1- Chang C.-C Department of Chemical Engineering Tatung University 40 Chungshan North Road Section 3, Taipei 104, Taiwan e-mail: cpyang@ttu.edu.tw Tel.: +886-2-25925252 ext. 2977 Fax: +886-2-25861939, TW aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer