Organosilane, ionic organosilane, membrane composition, and membrane

An ionic organosilane represented by the formula:

• wherein:
• each X independently represents Cl, Br, or I;
• each Ar1 independently represents a phenylene group optionally substituted by 1 to 4 alkyl groups selected from methyl or ethyl;
• each R1 independently represents an alkylene group having from 2 to 18 carbon atoms;
• each R2 independently represents methyl or ethyl;
• each R3 independently represents an alkylene group having from 1 to 18 carbon atoms;
• each R4 independently represents an alkylene group having from 2 to 18 carbon atoms;
• each R5 independently represents H or methyl;
• each R6 independently represents alkyl having from 1 to 4 carbon atoms, or allyl;
• and
• n is an integer in a range of 0 to 5, inclusive.

A membrane composition comprising components:

• (a) a copolymer comprising the divalent monomer units:
• wherein:
• R5 represents H or methyl;
• R6 represents alkyl having from 1 to 4 carbon atoms, or allyl;
• and
• X represents Cl, Br, or I, and
• wherein monomer unit (i) and monomer unit (ii) are present in a respective mole ratio of 1.5:1 to 3:1;
• and
• (b) an ionic organosilane compound represented by the formula:
• wherein:
• each Ar1 independently represents a phenylene group optionally substituted by 1 to 4 alkyl groups selected from methyl or ethyl;
• each R1 independently represents an alkylene group having from 2 to 18 carbon atoms;
• each R2 independently represents methyl or ethyl;
• each R3 independently represents an alkylene group having from 1 to 18 carbon atoms;
• each R4 independently represents an alkylene group having from 2 to 18 carbon atoms;
• and
• n is an integer in a range of 0 to 5, inclusive;
• and
• wherein component (a) and component (b) are present in a respective weight ratio in a range of 99.5:0.5 to 98:2.