what is hygroscopicity, impregnation?
Answers
Answer:
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Explanation:
This study describes the use of cassava starch acetate (CSA) to impregnate Kraft paper and its influence on the water vapor permeability (Kw). This barrier property depends on the water vapor diffusion coefficient (Deff) and the material hygroscopicity properties (adsorptivity, β). The influences of Deff and β on the Kw value were studied. Kraft paper samples were impregnated at atmospheric pressure and under vacuum. The results showed an important decrease on the Kw values, which was associated with two factors: (a) the partial filling of the Kraft paper superficial and internal pores by the impregnated CSA, reducing the Kw; (b) as CSA is much less hygroscopic than paper, its adsorptivity is reduced significantly by impregnation. This paper demonstrates that CSA impregnation of Kraft paper is an interesting alternative for the improvement of the hygroscopic properties and water vapor permeability of the Kraft paper.
Answer:
Hygroscopy :
Hygroscopy is the phenomenon of attracting and holding water molecules via either absorption or adsorption from the surrounding environment, which is usually at normal or room temperature.If water molecules become suspended among the substance's molecules, adsorbing substances can become physically changed, e.g., changing in volume, boiling point, viscosity or some other physical characteristic or property of the substance.
Impregnation :
Impregnation(Noun) The act of making pregnant; fertilization. impregnation(Noun) The fact or process of imbuing or saturating with something; diffusion of some element, idea etc. through a medium or substance.to make pregnant; get with child or young. to fertilize. to cause to be infused or permeated throughout, as with a substance; saturate: to impregnate a handkerchief with cheap perfume.