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Blending of poly(benzimidazole) (PBI) with a low molecular weight ether imide model compound
Author(s) -
De Jong B.,
Waddon A. J.,
Karasz F. E.,
Macknight W. J.
Publication year - 1992
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760321510
Subject(s) - materials science , differential scanning calorimetry , imide , benzimidazole , ether , glass transition , casting , phase (matter) , optical microscope , polymer chemistry , chemical engineering , composite material , scanning electron microscope , polymer , organic chemistry , thermodynamics , chemistry , physics , engineering
Poly(benzimidazole) (PBI) was solution‐blended with a low molecular weight ether‐imide analog to Ultem 1000. The as‐cast blends were found to form one‐phase structures over the whole of the composition range. By the use of optical microscopy and differential scanning calorimetry, the blends were found to phase separate on heating above the blend glass transition temperature ( T g ) but did not remix on cooling. It was concluded that the blends formed on room temperature casting were nonequilibrium and remained one‐phase simply because they were well below T g .