ELASTOMERS WITH EXCEPTIONAL ELONGATION
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United States of America Patent
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Nov 3, 2016
app pub date -
Apr 20, 2016
filing date -
Apr 28, 2015
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Abstract
Nanocomposites exhibiting elongation exceeding about 2000%, elastic recovery, and tensile strength exceeding 2.5 MPa are described. A method these elastomers involves performing a catalyzed step growth polymerization of a heterobifunctional siloxane macromonomer compounded with at least about 15 wt % surface passivated silica nanoparticles. The macromonomer has a degree of polymerization of at least about 40 and the silica nanoparticles have nominal diameters of less than about 50 nm.
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