Modified Hyper-Branched Polymer and Proton Exchange Membrane Applied with the Same, and Method for Manufacturing the Proton Exchange Membrane

A method for manufacturing a proton exchange membrane, comprising:

• forming a bismaleimide (BMI)-based hyper-branched polymer;
• preparing a sulfonated tetrafluorethylene copolymer solution with a solvent of dimethyl acetamide (DMAc);
• adding 10 to 15, by weight, of the BMI-based hyper-branched polymer into 90 to 85, by weight, of the sulfonated tetrafluorethylene copolymer solution, and a mixture thereof stood still and heated to about 50° C. so that the BMI-based hyper-branched polymer and sulfonated tetrafluorethylene copolymer are interpenetrated each other to form a solution of interpenetrating polymer;
• providing a solution of sulfonic compound with double bonds;
• adding 0.5 to 1, by weight, of the sulfonic compound with double bonds into 99.5 to 99, by weight, of the solution of interpenetrating polymer, a mixture thereof stood still at room temperature for grafting the sulfonic compound on parts of the chain ends of the BMI-based hyper-branched polymer to form a solution containing interpenetrating modified hyper-branched polymer;
• and
• coating the solution containing interpenetrating modified hyper-branched polymer on a substrate, followed by baking, and then performing a pre-treatment step to remove DMAc residue, thereby forming the proton exchange membrane.

A method for manufacturing a proton exchange membrane, comprising:

• forming a solution of bismaleimide (BMI)-based hyper-branched polymer;
• providing a solution of sulfonic compound with double bonds;
• adding 1 to 5, by weight, of the sulfonic compound with double bonds into 99 to 95, by weight, of the solution of BMI-based hyper-branched polymer, and a mixture being heated to about 50° C. for grafting the sulfonic compound on parts of the chain ends of the BMI-based hyper-branched polymer to form a solution containing modified BMI-based hyper-branched polymer;
• preparing a sulfonated tetrafluorethylene copolymer solution with a solvent of dimethyl acetamide (DMAc);
• adding 10 to 15, by weight, of the modified BMI-based hyper-branched polymer into 90 to 85, by weight, of the sulfonated tetrafluorethylene copolymer solution, and a mixture thereof being stood still and heated to about 50° C. so that the modified BMI-based hyper-branched polymer and sulfonated tetrafluorethylene copolymer are interpenetrated each other to form a solution containing interpenetrating modified hyper-branched polymer;
• and
• coating the solution containing interpenetrating modified hyper-branched polymer on a substrate, followed by baking, and then performing a pre-treatment step to remove DMAc residue, thereby forming the proton exchange membrane.