Touch sensitive device comprising electroactive film, display device comprising the same, and method of manufacturing the electroactive film

A touch sensitive device comprising:

• an electroactive film comprising a siloxane polymer formed from crosslinking a polysiloxane represented by Chemical Formula 1 with a silicon-based crosslinker represented by Chemical Formula 2,
• wherein the polysiloxane represented by Chemical Formula 1 has terminal vinyl groups, and wherein the terminal vinyl groups react with a Si—H or a Si—OH present in the silicon-based crosslinker of Chemical Formula 2 to be crosslinked,
• wherein the silicon-based crosslinker represented by Chemical Formula 2 forms ferroelectric polymer regions in the siloxane polymer
• wherein the polysiloxane represented by Chemical Formula 1 forms dielectric elastomer regions in the siloxane polymer,
• wherein the ferroelectric polymer regions and the dielectric elastomer regions are alternatively stacked layer by layer in a multilayer structure when the electroactive film is elongated,
• wherein the electroactive film has a dielectric constant that increases 15% to 54.4% when the electroactive film is uniaxially or biaxially elongated at an elongation rate of 100% to 400% at 60° C. to 80° C., as compared to a dielectric constant before the electroactive film is elongated;
• wherein in Chemical Formula 1, R1 and R2 is each independently a C1 to C20 alkyl group, a C1 to C20 aryl group, a C1 to C20 cycloalkyl group or a hydrogen atom, and m is an integer of 1 or more,
• wherein in Chemical Formula 2, R3 to R7 is each independently a C1 to C20 alkyl group, a C1 to C20 aryl group, a C1 to C20 cycloalkyl group or a hydrogen atom, R8 is a hydrogen atom or a hydroxyl group, n is 0 or an integer of 1 or more, and o is an integer of 2 or more, and
• further wherein (i) in Chemical Formula 2, one or more of R7 and R8 is each independently substituted with a fluoro group or a chloro group prior to crosslinking, or (ii) wherein after the siloxane polymer is formed from crosslinking the polysiloxane represented by Chemical Formula 1 with the silicon-based crosslinker represented by Chemical Formula 2, some hydrogen atoms of a Si—H group or some hydroxyl groups of a Si—OH group present in a backbone of a repeating unit derived from the silicone-based crosslinker represented by Chemical Formula 2 are substituted with a fluoro group or a chloro group.