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Electro-optical properties of Tripropyleneglycoldiacrylate/E7 composite materials are investigated. Films of these materials are prepared according to the Polymerization Induced Phase Separation method under Electron-Beam curing. The electro-optical responses depend strongly upon radiation dose. Shortly after film preparation, the transmission in the absence of electric field evolves with the time. Initially, the film is clear and become increasingly opaque as time evolves. This is especially the case for films prepared under low EB dose and gives evidence of the long process of phase separation in late stages. The decrease of transmission with the film thickness is also investigated. The results indicate that such a decrease is exponential but depend on the EB dose used to cure the precursor mixtures. [ABSTRACT FROM AUTHOR] more...