Poly films radiation grafting

Film Preparation. Hema and NVP were radiation-grafted onto Silastic to make poly (HEMA)/Silastic and poly (NVP)/Silastic hydrogels as previously described (13). 

The poly (HEM A) sheets were prepared by B. Ratner using a special technique he developed. The HEMA solutions were poured between glass plates, and polymerization was chemically initiated. The chemical and physical properties of this material are very similar to those of radiation-grafted poly (HEMA) insofar as protein adsorption is concerned. Heterogeneous or homogeneous poly (HEMA) films were made by polymerization in solvents in which the poly (HEMA) is insoluble or soluble, respectively the result is a white opaque material in the first case and a transparent material in the second case. The resulting films were washed free of excess monomer and then soaked in the buffer to be used in the fibrinogen adsorption experiment for 10 days at 37 °C prior to the actual experiment. 

Figure 4. Fibrinogen adsorption onto radiation-grafted poly(HEMA)/ Silastic Effect of graft level. Films grafted to the degree depicted were equilibrated at 37°C for 20 hrs in 1 mg/ml fibrinogen solution in 0.01 M HEPES, 0.147M NaCl, 0.02% azide, pH 7.4 and then rinsed by dilution displacement and extensive soaking with buffer at room...

Higgins, S.J., K.V. Lovell, R.M.G. Rajapakse, N.M. Walsby. 2003. Grafting and electrochemical characterisation of poly-(3,4-ethylenedioxythiophene) films, on Nafion and on radiation-grafted polystyrenesulfonate-polyvinylidene fluoride composite surfaces. J Mater Chem 13 2485. 

The objective of this chapter is to review the latest progress in the preparation of radiation-grafted PEMs for fuel cells using EB. In particular, the results associated with the preparation and the properties of two types of membranes having polystyrene sulfonic acid (PSSA) grafted to poly(vinylidene fluoride) (PVDF) films are reviewed. The fundamentals of RIG operation with EB accelerators are also briefly reviewed to furnish a clear understanding of the mechanism of PEM formation and how membrane composition and, consequently, their properties can be controlled. 

Herman H, Slade RCT, Varcoe JR (2003) The radiation-grafting of vinylbenzyl chloride onto poly(hexafluoropfopylene-co-letrafluoroethylene) films with subsequent conversion to alkaline anion-exchange mcanbranes optimisation of the experimental conditions and characterization. J Membr Sci 218 147-163... 

Chen J, Asano M, Maekawa Y, Yoshida M. Polymer electrolyte hybrid membranes prepared by radiation grafting of p-styryltrimethoxysilane into poly (ethylene-co-tetrafluo-roethylene) films. J Membr Sci 2007 296 77-82. 

T. Momose, H. Yoshioka, . Ishigaki and J. Okamoto, Radiation grafting of ,/9,y9-trifluoros-tyrene onto poly(ethylene-tetrafluoroethylene) film by preirradiation method. I. Effects of preirradiation dose, monomer concentration, reaction temperature, and film thickness, J. Appl. Polym. Sci. 37, 2817 (1989). 

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