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A rotary enthalpy exchange wheel having a rotatable wheel with air passageways extending from a front side to a back side for passing air streams therethrough. The wheel has a rigid substrate which is coated or laminated with a desiccant composition having a sulfonated block copolymer. The sulfonate

A rotary enthalpy exchange wheel having a rotatable wheel with air passageways extending from a front side to a back side for passing air streams therethrough. The wheel has a rigid substrate which is coated or laminated with a desiccant composition having a sulfonated block copolymer. The sulfonated block copolymer has at least one end block A and at least one interior block B, wherein each A block contains essentially no sulfonic acid or sulfonate ester functional groups and each B block is a polymer block containing from about 10 to about 100 mol percent sulfonic acid or sulfonate ester functional groups based on the number of monomer units.

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1. A rotary enthalpy exchange wheel comprising: a rotatable wheel having air passageways extending from a front side to a back side for passing air streams therethrough, said wheel comprising a rigid plastic substrate,the rigid plastic substrate coated or laminated with a desiccant composition compr

1. A rotary enthalpy exchange wheel comprising: a rotatable wheel having air passageways extending from a front side to a back side for passing air streams therethrough, said wheel comprising a rigid plastic substrate,the rigid plastic substrate coated or laminated with a desiccant composition comprising a sulfonated block copolymer and a second desiccant other than a sulfonated block copolymer,wherein the sulfonated block copolymer has at least one end block A and at least one interior block B, wherein each A block contains essentially no sulfonic acid or sulfonate ester functional groups and each B block is a polymer block containing from about 10 to about 100 mol percent sulfonic acid or sulfonate ester functional groups based on the number of monomer units. 2. The rotary enthalpy exchange wheel of claim 1, wherein the desiccant composition is laminated on the substrate. 3. The rotary enthalpy exchange wheel of claim 1, wherein the desiccant composition is adhesively laminated on the substrate. 4. The rotary enthalpy exchange wheel of claim 3, wherein the water uptake of the desiccant composition increases at least 20% when the relative humidity is changed from 20% and 80%. 5. The rotary enthalpy exchange wheel of claim 3, wherein the water uptake of the desiccant composition as a result of water sorption is at least 30% when the relative humidity of an air stream has a relative humidity above 80%. 6. The rotary enthalpy exchange wheel of claim 1, wherein the wheel is substantially circular having a plurality of separated sections, wherein the passageways are oriented to permit air stream flow in opposite directions between at least two of the sections without substantial intermixture. 7. The rotary enthalpy exchange wheel of claim 1, wherein the rigid plastic forms a matrix within the rotatable wheel. 8. The rotary enthalpy exchange wheel of claim 1, wherein the wheel rotates about a hub. 9. The rotary enthalpy exchange wheel of claim 1, wherein the plastic substrate is made up of polystyrene, polyethylene, polypropylene, polyester, nylon, or a mixture thereof. 10. A rotary enthalpy exchange wheel comprising: a rotatable wheel having air passageways extending from a front side to a back side for passing air streams therethrough, said wheel comprising a rigid substrate,the rigid substrate coated or laminated with a desiccant composition comprising a sulfonated block copolymer and a second desiccant other than a sulfonated block copolymer,wherein the sulfonated block copolymer has at least one end block A and at least one interior block B, wherein each A block contains essentially no sulfonic acid or sulfonate ester functional groups and each B block is a polymer block containing from about 10 to about 100 mol percent sulfonic acid or sulfonate ester functional groups based on the number of monomer units. 11. The rotary enthalpy exchange wheel of claim 10, wherein the second desiccant is selected from zeolites, molecular sieves, silica gel, lithium chloride, or a mixture thereof. 12. The rotary enthalpy exchange wheel of claim 11, wherein the second desiccant is silica gel. 13. The rotary enthalpy exchange wheel of claim 10, wherein the second desiccant is an inorganic desiccant. 14. The rotary enthalpy exchange wheel of claim 10, wherein the rigid substrate comprises a metal, a plastic, or a composite material. 15. The rotary enthalpy exchange wheel of claim 10, wherein the rigid substrate is aluminum. 16. The rotary enthalpy exchange wheel of claim 10, wherein the desiccant composition is laminated on the substrate. 17. The rotary enthalpy exchange wheel of claim 10, wherein the desiccant composition is adhesively laminated on the substrate. 18. The rotary enthalpy exchange wheel of claim 10, wherein the water uptake of the desiccant composition increases at least 10% when the relative humidity is changed from 20% and 80%. 19. The rotary enthalpy exchange wheel of claim 10, wherein the water uptake of the desiccant composition is at least 19% when the relative humidity of an air stream has a relative humidity at 80% and above. 20. The rotary enthalpy exchange wheel of claim 10, wherein the wheel is substantially circular having a plurality of separated sections, wherein the passageways are oriented to permit air stream flow in opposite directions between at least two of the sections without substantial intermixture. 21. The rotary enthalpy exchange wheel of claim 10, wherein the rigid substrate is plastic. 22. The rotary enthalpy exchange wheel of claim 10, wherein the wheel rotates about a hub. 23. The rotary enthalpy exchange wheel of claim 10, wherein the plastic substrate is made up of polystyrene, polyethylene, polypropylene, polyester, nylon, or a mixture thereof. 24. A desiccant composition for a rotary enthalpy exchange wheel exchanger comprising: a sulfonated block copolymer comprising at least one end block A and at least one interior block B, wherein each A block contains essentially no sulfonic acid or sulfonate ester functional groups and each B block is a polymer block containing from about 10 to about 100 mol percent sulfonic acid or sulfonate ester functional groups based on the number of monomer units,the sulfonated block copolymer mixed with a second desiccant different from said sulfonated block copolymer,wherein the desiccant composition is coated or laminated on a rotary enthalpy exchange wheel. 25. The desiccant composition of claim 24, wherein the second desiccant is selected from zeolites, molecular sieves, silica gel, lithium chloride, or a mixture of such. 26. The desiccant composition of claim 25, wherein the second desiccant is silica gel. 27. The desiccant composition of claim 24, wherein the second desiccant is an inorganic desiccant. 28. The desiccant composition of claim 24, wherein the second desiccant is an organic desiccant. 29. A rotary enthalpy exchange wheel comprising: a rotatable wheel having air passageways extending from a front side to a back side for passing air streams therethrough, said wheel comprising a metal substrate,the metal substrate coated or laminated with a sulfonated block copolymer and a desiccant other than a sulfonated block copolymer,wherein the sulfonated block copolymer has at least one end block A and at least one interior block B, wherein each A block contains essentially no sulfonic acid or sulfonate ester functional groups and each B block is a polymer block containing from about 10 to about 100 mol percent sulfonic acid or sulfonate ester functional groups based on the number of monomer units. 30. The rotary enthalpy exchange wheel of claim 29, wherein the metal substrate is aluminum.