Fluorosilicone polyimides

Scheme 6.15 Structure of fluorosilicone polyimide. Taken from Ref. [67].

Z. Gu, P. Zhang, Q. Han, Q. Huang, M. Kang, Y. Huang, Synthesis and characterization of novel fluorosilicone polyimides with high optical transparency. High Perfor. Polym. 26 (3) (2014)335-346. 

Silicone and butadiene/acrylonitrile elastomers have been successfully incorporated into an addition polyimide adhesive LARC-13. Two approaches were used to accomplish this task. Fluorosilicone (Silastic) and vinyl-terminated (Sylgard) silicone rubbers were physically blended into the adhesive amic acid and aromatic ATBN and aromatic amine-terminated silicone elastomers were chemically reacted into the prepolymer backbone. Each of the four resins displayed a distinct and separate Tg for the resin and elastomer phases. Incorporation of elastomer particles at a concentration of 15% by weight solids resulted in a 6- to 7-fold increase in peel strength and a 3- to 5-fold increase in the fracture toughness of LARC-13. This improvement in toughness was accomplished at a sacrifice in the elevated temperature adhesive strength of the material. 

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