Absorbtion mechanism

Bronaugh R. In Bronaugh R, Maibach H, eds. Percutaneous Absorbtion Mechanisms-Methodology-Drug Delivery. New York, Basel, Hong Kong Marcel Dekker, Inc., 1989 423-427. 

The absorbed water molecules are more strongly bound to alkylsulfonated rather than perfluorinated polymers. One can assume that this is related to the difference in the absorbtion mechanisms and to the physical state of absorbed water in PBI-PS and perfluorinated polymer electrolytes. 

In contrast, the dielectric losses in ceramics are directly related to microstructural and grain boundary properties. Thus polycrystalline materials, such as alumina, can have an order of magnitude higher loss than their single crystal counterparts. It is this extrinsic nature of the absorbtion mechanism which Ho believes accounts, at least in part, for the rapid rise in loss tangent of polycrystalline ceramics. Further, the mechanism giving rise to the observed loss at low and moderate temperatures appeared to be quite different from that at higher temperatures. 

Particulates can either cross into the lymphatics at the spaces in the tracheobronchial wall where epithelial cells directly overlay lymphoid tissue or pass through the endothelium of thin capillary walls in the air spaces. The transfer is a portion of a clearance mechanism that assists the lung in maintaining its normal function of gas exchange. Absorbtion and transport mechanisms of a variety of materials that enter the lymphatics continue to be studied. It was shown early in this century that water, dyes, proteins, bacteria, lipids, and particulates enter the lymphatic system relatively easily. The rates of transport and quantity vary with the size and chemistry of the material. Classic studies by Kihara (1924 1950) and Nishikawa (1941) dem-... 

Figure 1.3 present spectra of XLV dye solution absorbtion in the mixture of formic and trifluoro-acetic acids, solutions of dyed fibres before and after spinneret, which are practically laid on each other, showing full solution of the dye and good homogeneization of polymer melt. It should be noted that the samples of fibres, being studied, fully dissolved in solvents without formation of residues (possible products of dye and PCA interaction), which tells about inertia of components regarding each other. Blinding screen was caused mainly by impurities of mechanical nature. 

Otaigbe, U.J. O.D. Adams. Bioabsorbable soy protein plastic composites Effect of polyphosphate fillers on water absorbtion and mechanical properties. /. Environ. Polym. Degrad. 1997b, 5, 199-208. 

All polymers are susceptible to the absorbtion of moisture. In general this results in a reduction in mechanical properties and glass transition temperature. 

Y. Altun, M. Dogan, and E. Bayramli, Effect of alkaline treatment and pre-impregnation on mechanical and water absorbtion properties of pine wood flour containing poly (lactic acid) based green-composites. 7 Polym. Environ. 21(3), 850-856 (2013). 

While the water absorbtion of PPO -PA blend is a straight function of the polyamide content (fig.10), the net effect on the mechanical properties shows major synergism as Indicated in the tensile stress-strain diagram (fig. 11) where the dry as molded and 50 % relative humidity conditioned PP0 /PA blends maintains very close properties. A major drop In tensile strength is observed for Its parent polyamide 66. 

Turner J, Kurtz S, Bracco P, Costa L. The effect of cholesteryl acetate absorbtion on the mechanical behavior of crosslinked and conventional UHMWPE. Tram 53rd Orthop Res Soc 2003 28 1423. 

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