Premium
Geometry and nature of the interfacial layer in polyimide coatings
Author(s) -
Startsev V. M.,
Kiselev M. R.,
Chugunova N. F.
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.760320202
Subject(s) - materials science , polyimide , volume fraction , polymer , composite material , layer (electronics) , coating , differential scanning calorimetry , aluminium , relaxation (psychology) , thermodynamics , psychology , social psychology , physics
A new approach to the quantitative evaluation of the thickness h i and the volume fraction V i of the interfacial layer in polyimide coatings has been developed using the model of a one‐sided polymer coating as a three‐phase system (a substrate, an interfacial layer and a polymer matrix) and the method of differential scanning calorimetry. The new approach is characterized by the fact that a “pure” polymer matrix is modeled with the help of free films obtained on mercury. The formulas for the calculation of the thickness and volume fraction of the interfacial layer have been proposed. The value h i has been determined in polymer coatings of different thicknesses on aluminium foil. This parameter has been shown to be independent of the film thickness if the latter is not larger than the length of the interfacial layer. An assumption has been made about the “mechanical” origin of thick (> 1–5 μm) interfacial layers, and their relaxation character has been revealed.