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Mechanical and Thermal Properties of Networks Prepared from Reactive Poly(urethane‐imide)s and Blocked Polyurethane Prepolymer
Author(s) -
Iyer N. Padmanabha,
Gnanarajan T. Philip,
Radhakrishnan Ganga
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20020301)203:4<712::aid-macp712>3.0.co;2-f
Subject(s) - prepolymer , imide , polyurethane , thermal stability , polymer chemistry , octane , materials science , polymer , polyimide , pyromellitic dianhydride , chemistry , composite material , organic chemistry , layer (electronics)
Reactive poly(urethane‐imide)s with varying functionality were prepared using 4,8‐diphenyl‐1,5‐diazabicyclo(3.3.0)octane‐2,3,6,7‐tetracarboxylic dianhydride, 4,8‐(di‐ p ‐phenylol)‐1,5‐diazabicyclo(3.3.0)octane‐2,3,6,7‐tetracarboxylic dianhydride and N ‐methylaniline blocked polyurethane prepolymer ( 1 ). The resulting polymers with reactive phenylol groups, pendent in the dianhydride, were treated with 1 to give poly(urethane‐imide) networks. The cast films were characterized by FT‐IR, TG, static and dynamic mechanical analyses. Thermal stability of the polymers was found to be higher than that of the conventional polyurethane. Higher cross‐linking leads to lower damping and improved strength.