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Moisture absorption phenomenon in permeable fiber polymer composites
Author(s) -
Rao R. M. V. G. K.,
Balasubramanian N.,
Chanda Manas
Publication year - 1981
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1981.070261209
Subject(s) - composite material , materials science , fiber , composite number , volume fraction , moisture , natural fiber , thermal diffusivity , epoxy , diffusion , synthetic fiber , absorption (acoustics) , absorption of water , glass fiber , thermodynamics , physics
Studies were conducted on the moisture absorption characteristics of jute fiber composites based on polyester and epoxy resin systems, under constant humidity (ø) and ambient temperature ( T ) conditions. The initial slope of the moisture absorption curve (a direct measure of the composite diffusivity) increased with increased superficial fiber volume fraction ( V f ), where as the time ( t m ' ), needed to reach the equilibrium moisture absorption value showed a reversed trend. This behavior is just a reverse to that observed 1 in case of composites with practically impermeable fibers (e.g., glass and graphite) in the same resin matrices. The theoretical expressions governing moisture diffusion phenomenon in impermeable fiber composites were modified and analyzed for the case of composites containing a permeable fiber. The experimental data obtained on the latter were then discussed in relation to the modified theory. The meaning of a correct fiber volume fraction ( V f ,) as applicable to permeable fiber composites was defined.