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Electrical dissipation factor: Guide to molding quality graphite/resin composites
Author(s) -
Pike R. A.,
Douglas F. C.,
Wisner G. R.
Publication year - 1971
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.760110609
Subject(s) - materials science , composite material , epoxy , compression molding , graphite , dissipation , polyimide , void (composites) , molding (decorative) , dissipation factor , transfer molding , capacitance , penetration (warfare) , mold , chemistry , physics , optoelectronics , electrode , layer (electronics) , operations research , dielectric , engineering , thermodynamics
Determination of the change in electrical dissipation factor and capacitance of epoxy/graphite and polyimide/graphite composites during compression molding provides a reproducible means of obtaining low void content composites by permitting accurate application of low pressure at the resin gel point. Of the two parameters, change in dissipation factor was found to be the more sensitive to molecular changes in the resin matrix as well as to variations in solvent content, particularly with the polyimide systems. The simple laboratory equipment required to carry out these electrical measurements is described.