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Preparation of copoly(amide‐imide)s via direct polycondensation
Author(s) -
Choi KilYeong,
Hong YoungTaik
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971180122
Subject(s) - imide , condensation polymer , thionyl chloride , polyamide , polymer chemistry , trimellitic anhydride , amide , materials science , glass transition , thermal decomposition , diamine , triphenyl phosphite , chemistry , polymer , chloride , organic chemistry , composite material
Preparation of various kinds of copoly(amide‐imide) was carried out via direct polycondensation of trimellitic anhydride (TMA) with the corresponding diamine mixture in the presence of an equimolar amount of thionyl chloride (TC) as a condensing agent followed by thermal imidization. The resulting copoly(amide‐imide)s had inherent viscosities in the range of 41 to 68 mL g −1 and glass transition temperatures of 215°C to 291°C. These copoly(amide‐imide)s had relatively good thermomechanical properties. That is, the initial decomposition temperature (IDT) and tensile strength were 350–409°C and 104–121 MPa, respectively. The melt viscosities of the copoly(amide‐imide)s measured at 345°C under a frequency of 10 2 rad s −1 were in the range of 4.8 × 10 2 ∼ 4.5 ˜ 10 3 Pa s depending on comonomers, which are somewhat lower than that commerciallized PAI with 5.6 × 10 3 Pa s.