Block polymer and polymer electrolyte membrane including same

A block polymer comprising:

• a hydrophobic block;
• and
• a hydrophilic block,
• wherein the hydrophobic block comprises at least one cationic side chain, and
• the hydrophilic block comprises a unit derived from a compound represented by the following Chemical Formula 1:
• wherein, in Chemical Formula 1,
• A is —SO3H, —SO3−M+, —COOH, —COO−M+, —PO3H2, —PO3H−M+, —PO32−2M+, —O(CF2)mSO3H, —O(CF2)mSO3−M+, —O(CF2)mCOOH, —O(CF2)mCOO−M+, —O(CF2)mPO3H2, —O(CF2)mPO3H−M+ or —O(CF2)mPO32−2M+;
• m is an integer of 2 to 6;
• M is a group 1 element;
• R1 to R5 are the same as or different from each other, and each independently hydrogen;
• a halogen group;
• or a hydroxyl group;
• at least two of R1 to R5 are a halogen group;
• or a hydroxyl group;
• R6 and R7 are the same as or different from each other, and each independently a halogen group;
• L(a) is a direct bond;
• S;
• O;
• NRa;
• SO2;
• or a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms;
• Ra is hydrogen;
• or a substituted or unsubstituted alkyl group;
• and
• n is an integer of 2 to 10, and structures in the 2 to 10 parentheses are the same as or different from each other,
• wherein the hydrophobic block comprises a unit represented by the following Chemical Formula 2 or Chemical Formula 3:
• wherein, in Chemical Formula 2 and Chemical Formula 3,
• S1 to S4 are the same as or different from each other, and each independently hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a nitrile group;
• a nitro group;
• a hydroxyl group;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted cycloalkyl group;
• a substituted or unsubstituted alkoxy group;
• a substituted or unsubstituted alkenyl group;
• a substituted or unsubstituted silyl group;
• a substituted or unsubstituted aryl group;
• a substituted or unsubstituted heterocyclic group;
• -(L)o-N+RR′R″;
• -(L)o-P+RR′R″;
• or the following Chemical Formula 1-A;
• L is a direct bond;
• O;
• NR′″;
• S;
• or a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms;
• o is an integer of 1 to 10;
• when o is 2 or greater, two or more Ls are the same as or different from each other;
• R, R′, R″, R′ and Rb are the same as or different from each other, and each independently hydrogen;
• or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms:
• a, a′, b and b′ are each an integer of 1 to 4;
• and
• when a, a′, b and b′ are each an integer of 2 or greater, structures in the two or more parentheses are the same as or different from each other.