Sulfonated block copolymers and uses thereof
Disclosed herein is a styrenic block copolymer [A1-B1-C1], consisting essentially of polymer blocks A1, B1 and C1. A1 is a poly(para-alkylstyrene) block having a molecular weight from 1,000 to 60,000 g/mol. B1 is a hydrogenated polyisoprene block or a hydrogenated polybutadiene block having a molecular weight from 1,000 to 100,000 g/mol. C1 is a polystyrene block having a molecular weight from 1,000 to 100,000 g/mol; or a polymer block consisting essentially of polymerized styrene units, and hydrogenated butadiene and/or isoprene units, and having a molecular weight from 1,000 to 100,000 g/mol. Prior to hydrogenation, the block B1 has a vinyl content of 5-75 mol %; and the block C1 forms 1-80 wt % of the overall weight of the block copolymer. The selectively sulfonated forms of the copolymers are useful as high dielectric materials.
1. A styrenic block copolymer consisting essentially of polymer blocks A1, B1 and C1 and having a formula [A1-B1-C1], wherein
A1 is a poly(para-alkylstyrene) block having a molecular weight from 1,000 to 60,000 g/mol;
B1 is a hydrogenated polyisoprene block (E/P) or a hydrogenated polybutadiene block (EB) having a molecular weight from 1,000 to 100,000 g/mol; and
C1 is a polystyrene block having a molecular weight from 1,000 to 100,000 g/mol, or a polymer block consisting essentially of polymerized styrene units, and hydrogenated butadiene and/or isoprene units, and having a molecular weight from 1,000 to 100,000 g/mol;
wherein prior to hydrogenation,
the block B1 has a vinyl content of 5-75 mol %, and
the block C1 forms from 1-80 wt % of the overall weight of the block copolymer.
2. The block copolymer of claim 1 , wherein the poly(para-alkylstyrene) block is selected from a poly(para-methylstyrene) block, a poly(para-tert-butylstyrene) block, and combinations thereof.
3. The block copolymer of claim 1 , wherein the polymerized styrene units in the block C1 are sulfonated to the extent of 1-100 mol percent.
4. The block copolymer of claim 1 , wherein the C1 block forms from 1-10 wt. % of the overall block copolymer.
5. The block copolymer of claim 1 , wherein the B1 block forms 4-25 wt. % of the block copolymer.
6. The block copolymer of claim 1 , wherein
A1 is selected from a [(poly-p-tert-butyl alkylstyrene) block, a [(poly-p-methylstyrene) block, or combinations thereof, and having a molecular weight from 5,000-30,000 g/mol;
B1 is a hydrogenated polyisoprene block (E/P) having a molecular weight from 1000-50000 g/mol; and
C1 is a polystyrene block having a molecular weight from 1,000-20,000 g/mol.
7. The block copolymer of claim 6 , wherein the styrene units in the polymer block C1 are sulfonated to the extent of 1-100 mol percent.
8. The block copolymer of claim 6 , wherein the block B1 forms 4-25 wt. % of the block copolymer.
9. The block copolymer of claim 1 , wherein
A1 is a [(poly-p-tert-butyl alkylstyrene) block, a [(poly-p-methylstyrene) block, or combinations thereof having a molecular weight from 5,000-30,000 g/mol;
B1 is a hydrogenated polybutadiene block (E/B) having a molecular weight from 1000-50000 g/mol;
the block C1 consists essentially of polymerized styrene and hydrogenated butadiene units and has a molecular weight from 1,000-20,000 g/mol;
and prior to hydrogenation, the block C1 forms from 1-10 wt % of the overall weight of the block copolymer.
10. The block copolymer of claim 9 , wherein the block C1 has a controlled distribution of polymerized styrene units.
11. The block copolymer of claim 9 , wherein the block C1 has a random distribution of polymerized styrene units.
12. The block copolymer of claim 10 , wherein 10-100 mol percent of the polymerized styrene units in the block C1 are sulfonated.
13. A sulfonated styrenic block copolymer consisting essentially of polymer blocks A1, B1 and D1 and having a formula [A1-B1-D1], wherein
A1 is a poly(para-alkylstyrene) block having a molecular weight from 1,000 to 60,000 g/mol;
B1 is a hydrogenated polyisoprene block (E/P) or a hydrogenated polybutadiene block (E/B) having a molecular weight from 1,000 to 100,000 g/mol; and
D1 is a sulfonated polystyrene block; or a polymer block consisting essentially of sulfonated styrene units, and hydrogenated butadiene units and/or hydrogenated isoprene units;
wherein prior to hydrogenation,
the block B1 has a vinyl content of 5-75 mol %, and
the block D1 forms from 1-80 wt % of the overall weight of the block copolymer;
and wherein prior to sulfonation,
the block D1 is a polystyrene block having a molecular weight from 1,000 to 100,000 g/mol.
14. The sulfonated block copolymer of claim 13 , wherein the polymerized styrene units in the block D1 has a degree of sulfonation from 1-100 mole %.
15. The block copolymer of claim 13 , having one or more of a dielectric constant from 10 2 -10 8 , a loss angle from 0.05-0.25, a breakdown voltage from 500-1000 volts, and a specific resistance from 10 8 -10 18 ohm/cm, measured according to ASTM D150 test method.
16. A dielectric material comprising the block copolymer of claim 13 .
17. An insulating material comprising the block copolymer of claim 13 .