Synthesis and applications of photocrosslinkable polydimethyl siloxanes—Part III. Synthesis of polysiloxanes with perfluorinated and acrylated urethane linked pendant groups
✍ Scribed by B. Boutevin; L. Abdellah; M.N. Dinia
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 573 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
The synthesis of photocrosslinkable polysiloxanes containing perfluorinated pendant groups and that of acrylated groups linked by urethanes moieties was performed. The synthesis was carried out by copolycondensation of a, o-dihydroxypolydimethylsiloxane and dichloro silanes bearing fluorinated and acetoxy groups. The acrylation was conducted by an o-isocyanato-acrylate on the polysiloxane polyol prepared by acetolysis of the previous copolysiloxanes. The chain lengths are checked by addition of a monochlorosilane in order to obtain n;i, values of about 104 mol/g. The influence of the fluorine content on the properties was investigated. Actually the critical superficial tension decreased from 25.5 to 21.0 and the T8 of the copolymer decreased to -120°C when a C,F,, group was introduced. The use of these copolymers by U.V. curing was evaluated on sheets of aluminium, of PET and paper. The adhesion on these substrates are very good and release properties were studied, showing that incorporation of C,F,, pendant group gave the best results.