Curable Silicate-Siloxane Mixed Matrix Membrane Compositions

A modified silicone composition, comprising:

• (A) at least one curable silicone composition;
• and
• (B) at least one silicon additive prepared by a method comprising reacting an amine-functional silane, an amine-reactive compound having at least one free-radical polymerizable group per molecule, and an organoborane free-radical initiator;
• wherein the amine-functional silane has the formula:
• (R12NR2)aSiR3b(OR4)4-(a+b) (I)
• wherein a=1, 2, or 3;
• b=0, 1, 2, or 3;
• a+b=1, 2, 3, or 4;
• R1 is independently selected from hydrogen, C1-C12 alkyl, halogen-substituted C1-C12 alkyl, C1-C12 cycloalkyl, aryl, nitrogen-substituted C1-C12 alkyl, and aliphatic ring structures which bridge both R1 units and can be N-substituted;
• R2 is independently selected from C1-C30 alkyl;
• R3 is independently selected from hydrogen, halogen, C1-C12 alkyl, halogen-substituted C1-C12 alkyl, and —OSiR3′3, wherein R3′ is selected from C1-C12 alkyl, and halogen-substituted C1-C12 alkyl;
• and R4 is independently selected from hydrogen, C1-C12 alkyl, and halogen-substituted C1-C12 alkyl.