Block copolymers for directed self-assembly applications

A diblock copolymer of formula (D-1):

• E1-P′-L′-P″-E2 (D-1),
• wherein
• E1 is a monovalent first end group,
• E2 is a monovalent second end group,
• P′ is a first polymer chain representing a first block (block A) of the block copolymer, wherein block A comprises an ethylenic repeat unit of formula (A-1):
• wherein i) backbone carbons of the block copolymer are numbered 1 and 2 in (A-1), ii) Rw is a monovalent radical selected from the group consisting of H, F, methyl, ethyl, and trifluoromethyl (*—CF3), and iii) Rd is a monovalent radical comprising an aromatic ring linked to carbon 1,
• P″ is a second polymer chain representing a second block (block B) of the block copolymer, and
• L′ is a divalent linking group joining an end repeat unit of P′ to an end repeat unit of P″, wherein L′ comprises 1-24 fluorines, and each of the fluorines of L′ is linked to a backbone carbon of the block copolymer.

A block copolymer, comprising:

• a first polymer block (block A);
• a second polymer block (block B) having a chemical structure different from block A and capable of phase-segregating from block A, wherein block B comprises an aliphatic carbonate repeat unit;
• and
• a divalent linking group L′ covalently linking an end repeat unit of block A to an end repeat unit of block B, wherein L′ comprises 1-24 fluorines, wherein each of the fluorines of L′ is linked to a backbone carbon of the block copolymer.

A diblock copolymer of formula (D-1):

• E1-P′-L′-P″-E2 (D-1),
• wherein
• E1 is a monovalent first end group,
• E2 is a monovalent second end group,
• P′ is a first polymer chain representing a first block (block A) of the block copolymer,
• P″ is a second polymer chain representing a second block (block B) of the block copolymer, and
• L′ is a divalent linking group joining an end repeat unit of P′ to an end repeat unit of P″, wherein L′ is
• wherein backbone atoms of the block copolymer are numbered 1, 2, 3, 4, 5, 6, and 7 in L′, and n′ is an integer having a value of 1-12.