Impregnation of polymers

Supercritical Fluid Impregnation of Polymers for Drug Delivery... 

For mechanical test such as tensile test and flexural test, the impregnation of polymer-blend to the carbon fiber was carried out several soakings of the fiber in the polymer-blend dispersion consists of PTFE (98.2 wt%) and fluorinated-pitch (1.8 wt%). A sheet of chemical crosslinked pre-forming sample was prepared under the pressure at around 20 MPa and then heat-treated at 350 °C 5 °C for 30 minutes. Samples were irradiated by EB up to 1000 kGy at 335 °C 3 °C in nitrogen gas atmosphere. 

The 1990s witnessed the spread of supercritical techniques around the world very large industrial units were built in the United States and Australia for the treatment of coffee, tea, and hops. By the end of the 1990s, the discovery of new applications for supercritical fluids, such as for the production of microparticles, aerogels, and impregnation of polymers, strengthened the growing importance of supercritical CO2. 

Kikic, 1. Vecchione, F. (2003) Supercritical Impregnation of Polymers. Curr. Opin. Solid State Mater. Sci. Vol.7, No.4-5, pp.399-405... 

Supercritical modification of polymers was studied by several scientists to improve or change the properties of polymers. Polymers can either be chemically or physically modified. Examples of chemical modifications are the functionalization of polymers (grafting) or a chemical reaction of the functional groups of polymers to obtain new materials [38, 39]. Examples of physical modifications are the preparation of polymer blends, impregnation of polymers with additives [46], or foaming of polymers [59-61]. Another studied topic of polymer modification and impregnation is the supercritical dyeing of polymer fibers [40, 41). 

Kikic, I. and F. Vecchione, Supercritical impregnation of polymers. Current Opinion in Solid State Materials Science, 2003. 7(4,5) p. 399 05. 

Alessi, P., Cortesi, A., Kikic, I. and Colombo, I. (1998) Effect of Operating Parameters on the Impregnation of Polymers with Drugs, Proceedings of the 5 Meeting on Supercritical Fluids, Nice, pp. 373-378. 

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