Tri-block copolymer and electrolyte membrane made from the same

摘要

Provided are a tri-block copolymer and an electrolyte membrane prepared therefrom. The tri-block copolymer has a structure of polar moiety-containing copolymer block/non-polar moiety-containing copolymer block/polar moiety-containing copolymer block, or non-polar moiety-containing copolymer block/polar moiety-containing copolymer block/non-polar moiety-containing copolymer block, and is useful for an electrolyte membrane for fuel cells. The electrolyte membrane for fuel cells prepared from the tri-block copolymer exhibits superior dimensional stability and excellent fuel cell performance.

主权项

1. An electrolyte membrane including a tri-block copolymer, as a polymer electrolyte membrane for fuel cells, having a t-P-N-P-t or t-N-P-N-t molecular structure,
wherein t represents an end of a polymer formed by an end-forming monomer, P represents a copolymer block having a hydrophilic group represented by Formula 1 below, and N represents a copolymer block having a hydrophobic group represented by Formula 2 below, wherein the tri-block copolymer has a weight average molecular weight of 100,000 to 1,000,000 g/mol, and wherein A, C and V are each independently at least one selected from the group consisting of: R is —NO2 or —CF3; U is at least one selected from the group consisting of: X is —SO3H, —SO3−M+, —COOH, —COO−M+ or —PO32−2M+; M is Na or K; B is at least one selected from the group consisting of: W is at least one selected from the group consisting of: x:y is 1000:1 to 5:1, a:b is 1000:1 to 5:1; and 10≦m≦2000 and 5≦n≦800.