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Synthesis and characterization of new soluble and thermostable polyimides via novel diisocyanates
Author(s) -
Barikani Mehdi,
Yeganeh Hamid,
Ataei Shahram Mehdipour
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199912)48:12<1264::aid-pi293>3.0.co;2-n
Subject(s) - pyromellitic dianhydride , thermal stability , phthalic anhydride , polymer chemistry , condensation polymer , materials science , imide , monomer , solubility , polymer , diamine , polyimide , inherent viscosity , intrinsic viscosity , chemical engineering , organic chemistry , chemistry , composite material , layer (electronics) , catalysis , engineering
A facile synthesis of two novel diisocyanates containing methylene groups and preformed imide structure is described. Furthermore, six thermally stable and soluble polyimides were synthesized by polycondensation of these two diisocyanates with pyromellitic dianhydride (PMDA), 3, 3 ′,4, 4 ′‐benzophenonetetracarboxylic dianhydride (BTDA) and hexafluoroisopropylidene‐2,2‐bis‐(phthalic anhydride) (6FDA) in N,N ‐dimethyl acetamide. All monomers and polymers were characterized by conventional methods and their physical properties such as solution viscosity, solubility properties, thermal stability and thermal behaviour were studied. © 1999 Society of Chemical Industry