Abstract
Both dry and wet single filaments of cotton and polyester are observed under optical microscope and electron microscope. The wet filaments are obtained by keeping the filaments in the atmosphere of R. H. 100% for about one day.
The surfaces of both dry and wet polyester filaments have smooth appearance.
There are many rumples on the surface of cotton filament kept in 100% R. H. The surface is made considerably larger by these rumples.
The difference in surface structure between cotton and polyester seems to explain the difference in the moisture absorption power between the two materials.
