Synthesis of highly transparent poly(amide–imide)s based on trimellitic acid and dependence of thermal properties on monomer sequence

• DOI: 10.1016/j.reactfunctpolym.2016.04.016
• Publication Date: 2016-04-27T15:59:08Z
• Authors: Yutaro Kobayashi; Yumi Fujiwara; Takuya Kitaoka; Yoshiyuki Oishi; Yuji Shibasaki
• Keywords: Imide; Thermogravimetric analysis; Amide; Thermal Stability; Thermostability; Trimellitic anhydride

Abstract Transparent, thermally stable, and semiaromatic poly(amide–imide)s were prepared from hydrogenated trimellitic anhydride chloride (h-TAC) with various aromatic diamines. The dependence of thermostability on the monomer sequence and terminal group was investigated. Thermogravimetric/differential thermal analysis (TG/DTA) was performed to evaluate the thermostabilities, which were found to be primarily affected by the monomer sequence in the polymer units. The 5% weight loss temperature (T d5 ) in N 2 , glass transition temperature ( T g ), and cutoff wavelength of the ultraviolet–visible (UV–Vis) spectrum (λ cut ) of the semiaromatic poly(amide–imide)s are 422–456 °C, 131–274 °C, and 293–321 nm, respectively, while those of wholly aromatic poly(amide–imide)s are 454–480 °C, 169–287 °C, and 415 nm, respectively.