Copolymer formulation for directed self assembly, methods of manufacture thereof and articles comprising the same
View Patent ↗Disclosed herein is a composition comprising a block copolymer; where the block copolymer comprises a first polymer and a second polymer; where the first polymer and the second polymer of the block copolymer are different from each other and the block copolymer forms a phase separated structure; an additive polymer comprising a polymer wherein the surface tension of the polymer with the first polymer and the surface tension of the polymer with the second polymer are both lower than the surface tension between the first polymer and second polymer; where the additive polymer comprises a reactive functional moiety that forms a bond or a complex or a coordinate with the substrate upon being disposed on the substrate; where the reactive functional moiety is unreacted when it is a part of the composition; and a solvent.
1. A composition comprising:
an intimate mixture of complete volumes of a block copolymer; where the block copolymer comprises a first polymer and a second polymer; where the first polymer and the second polymer of the block copolymer are different from each other and the block copolymer forms a phase separated structure;
an additive polymer comprising a homopolymer or a random copolymer; wherein the average surface energy of the additive polymer lies between the surface energy of the first polymer and the surface energy of the second polymer of the block copolymer; where the additive polymer comprises a reactive functional moiety that forms a bond or a complex or a coordinate with the substrate upon being disposed on the substrate; where the reactive functional moiety is unreacted when it is a part of the composition; where the block copolymer is present in the composition in a weight ratio of 2:1 to 5:1 relative to the additive polymer; and
a solvent.
2. The composition of claim 1 , where the additive polymer is a copolymer that comprises a third polymer and a fourth polymer; where the third polymer and the fourth polymer of the additive polymer are different from each other; where the first polymer of the block copolymer is chemically identical with or substantially chemically similar to the third polymer of the additive polymer or where the second polymer of the block copolymer is chemically identical with or substantially chemically similar to the fourth polymer of the additive polymer.
3. The composition of claim 2 , where the first polymer and the third polymer is a vinyl aromatic polymer obtained by a polymerization of units having a structure of formula (1):
wherein R 5 is hydrogen, an alkyl, a haloalkyl or halogen; Z 1 is hydrogen, halogen, a hydroxyl, a haloalkyl or an alkyl; and p is from 1 to about 5.
4. The composition of claim 2 , where the second polymer and the fourth polymer is obtained from a polymerization of units having a structure represented by formula (2):
where R 1 is a hydrogen or an alkyl group having 1 to 10 carbon atoms; or where the second polymer has a structure derived from a monomer having a structure represented by the formula (3):
where R 1 is a hydrogen or an alkyl group having 1 to 10 carbon atoms and R 2 is a C 1-10 alkyl, a C 3-10 cycloalkyl, or a C 7-10 aralkyl group.
5. The composition of claim 1 , where the additive polymer is hydroxyl end-functionalized poly(styrene-r-methylmethacrylate) or a hydroxyl end-functionalized poly(styrene)-r-poly(methyl methacrylate)-r-poly(hydroxyethyl methacrylate).
6. The composition of claim 1 , where the additive polymer has a lower molecular weight than the block copolymer.
7. The composition of claim 1 , where the additive polymer is a random copolymer that comprises different polymers where a surface energy of respective polymers are higher and lower than those of the first polymer and the second polymer of the block copolymer respectively.
8. The composition of claim 1 , where first polymer and the second polymer is present in the block copolymer in an amount sufficient to form a cylindrical morphology, where the first polymer is present in an amount of 15 to 35 wt %, and wherein the second polymer is present in the block copolymer in an amount of 85 to 65 wt %, based on the total weight of the block copolymer.
9. The composition of claim 1 , where first polymer and the second polymer is present in the block copolymer in an amount sufficient to form a lamellar morphology, where the first polymer is present in an amount of 35 to 65 wt %, and wherein the second polymer is present in the block copolymer in an amount of 35 to 65 wt %, based on the total weight of the block copolymer.