Block copolymer
A block copolymer includes a polystyrene block including a styrene unit, and a polyalkyl (meth)acrylate block including an alkyl (meth)acrylate unit. The block copolymer includes an organic group that is bound to at least one end of a main chain of the block copolymer and that comprises a hetero atom. A polymerization initiation end of the block copolymer includes a structure derived from an alkyl lithium. The organic group included in the block copolymer includes a nitrogen atom, a sulfur atom, a phosphorus atom, a tin atom, or a combination thereof, or is represented by formula (1). R 1 represents a single bond or a divalent organic group having 1 to 30 carbon atoms; and R 2 represents a hydrogen atom, an aliphatic linear hydrocarbon group having 1 to 30 carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms, or the like.
1. A block copolymer comprising:
a polystyrene block comprising a styrene unit; and
a polyalkyl (meth)acrylate block comprising an alkyl (meth)acrylate unit,
the block copolymer comprising an organic group that is bound to at least one end of a main chain of the block copolymer and that comprises a hetero atom,
wherein a polymerization initiation end of the block copolymer comprises a structure derived from an alkyl lithium,
wherein the organic group included in the block copolymer comprises a nitrogen atom, a sulfur atom, a phosphorus atom, a tin atom, or a combination thereof, or is represented by formula (1):
wherein, in the formula (1), R 1 represents a single bond or a divalent organic group having 1 to 30 carbon atoms; and R 2 represents a hydrogen atom, an aliphatic linear hydrocarbon group having 1 to 30 carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms, or a group in which the aliphatic linear hydrocarbon group having 1 to 30 carbon atoms or the alicyclic hydrocarbon group having 3 to 30 carbon atoms comprises a hetero atom between adjacent two carbon atoms, and
wherein the organic group is not a monomeric unit included in the block copolymer.
2. The block copolymer of claim 1 , wherein the block copolymer is a diblock copolymer or a triblock copolymer.
3. The block copolymer of claim 1 , wherein the block copolymer is a diblock copolymer.
4. The block copolymer of claim 1 , wherein the organic group is bound to an end of the main chain of the polyalkyl (meth)acrylate block.
5. The block copolymer of claim 1 , wherein the block copolymer is a diblock copolymer the organic group is bound to an end of the main chain of the polyalkyl (meth)acrylate block.
6. The block copolymer of claim 1 , wherein the alkyl (meth)acrylate unit is a methyl methacrylate unit.
7. The block copolymer of claim 1 , wherein a molar ratio of styrene units to alkyl (meth)acrylate units in the block copolymer is no less than 10/90 and no greater than 90/10.
8. The block copolymer of claim 1 , wherein the organic group included in the block copolymer is derived from an epoxy compound.
9. The block copolymer of claim 1 , wherein the hetero atom is a nitrogen atom, a sulfur atom, a phosphorus atom, a tin atom or a combination thereof.
10. The block copolymer of claim 1 , wherein R 1 represents a divalent organic group having 2 to 30 carbon atoms.
11. The block copolymer of claim 1 , wherein R 1 represents an aliphatic linear hydrocarbon group having 2 to 30 carbon atoms and optionally comprising a hetero atom between adjacent two carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms and optionally comprising a hetero atom between adjacent two carbon atoms, or an aromatic hydrocarbon group having 6 to 30 carbon atoms and optionally comprising a hetero atom between adjacent two carbon atoms.
12. The block copolymer of claim 1 , wherein the organic group included in the block copolymer is represented by the formula (1).
13. The block copolymer of claim 12 , wherein R 1 represents a divalent organic group having 2 to 30 carbon atoms.
14. The block copolymer of claim 12 , wherein R 1 represents an aliphatic linear hydrocarbon group having 2 to 30 carbon atoms and optionally comprising a hetero atom between adjacent two carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms and optionally comprising a hetero atom between adjacent two carbon atoms, or an aromatic hydrocarbon group having 6 to 30 carbon atoms and optionally comprising a hetero atom between adjacent two carbon atoms.