Hydrophilic-oleophobic copolymer composition and uses thereof

A method of treating a contaminated water comprising:

• providing the contaminated water comprising water and oil;
• providing a membrane comprising a porous substrate and a coating attached to the porous substrate, wherein at least one of the porous substrate or the coating comprises a copolymer comprising 1 to 10 mole % of a structural unit of formula I;
• and 90 to 99 mole % of a structural unit of formula II,
• wherein
• R1 is a linear or branched C1-C30 fluoroalkyl group;
• R2 and R3 are independently at each occurrence a hydrogen, or a linear or branched C1-C4 alkyl group;
• either R4 and R5 are independently at each occurrence a linear or branched C1-C12 alkyl group, a C5-C12 carbocyclic group, or a C5-C12 heterocyclic group, and R6 and R7 are independently at each occurrence a linear or branched C1-C12 alkylene group, a linear or branched C2-C12 alkenylene group, a linear or branched C2-C12 alkynlene group, a C5-C12 carbocyclic group, or a C5-C12 heterocyclic group, or at least two of R4, R5, R6, or R7 together with the nitrogen atom to which they are attached form a heterocyclic ring containing 5 to 7 atoms;
• X is independently at each occurrence an —O— or —NH—;
• Y is a sulfite group or a carboxylate group;
• and
• m and n are independently at each occurrence an integer ranging from 1 to 5;
• and
• passing the contaminated water through the membrane to generate a treated water.