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The Thermal Stability of Linear Trans‐quinacridone Pigments
Author(s) -
Jones F.,
Okui N.,
Patterson D.
Publication year - 1975
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1975.tb03220.x
Subject(s) - pigment , thermal stability , diffraction , chemistry , scanning electron microscope , cis–trans isomerism , crystallography , materials science , stereochemistry , organic chemistry , optics , physics , composite material
Although linear trans‐quinacridone was first synthesized some forty years ago, it has appeared as a commercial pigment much more recently and was the first red pigment of a new chemical class for a very long time. It can be prepared with a number of different crystal structures all having the same chemical formula, but different hues. The γ‐form is the most stable. The transformations between this form and the β‐form, which can be brought about by heat and solvents, have been examined by a combination of differential thermal analysis, scanning electron microscopy and X‐ray diffraction.