Crosslinking of 1,9-bis[glycidyloxypropyl]penta- (1H,1H,2H,2H-perfluoroalkylmethylsiloxane)s with ,-diaminoalkanes:: The cure behavior and film properties
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AbstractA series of nine films were prepared via phenolcatalyzed thermal crosslinking reactions of 1,9bis [glycidyloxypropyl]pentasiloxanes {1,9bis[glycidyloxypro pyl]decamethylpentasiloxane (I), 1,9bis[glycidyloxypropyl]3,5,7tris(3,3,3trifluoropropyl)heptamethylpentasiloxane (II), and 1,9bis[glycidyloxypropyl]3,5,7tris(1H,1H,2H, 2Hperfluorooctyl)heptamethylpentasiloxane (III)} with ,diaminoalkanes [1,6diaminohexane (a), 1,8diaminooctane (b), and 1,12diaminododecane (c)]. The crosslink density was controlled by the choice of ac. The cure behavior of IIII with ac was studied with differential scanning calorimetry. The mechanical properties of the films were determined by dynamic mechanical thermal analysis. Their thermal stability was analyzed by thermogravimetric analysis. The surface properties of the films were evaluated with static contactangle measurements. These films represented a novel class of epoxies with an unusual combination of properties: high flexibility (low glasstransition temperature), good thermal stability, and hydrophobic surfaces. 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 203210, 2004
