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A method of making a polyether polymer comprises reacting a salt of a dihydroxy-substituted aromatic hydrocarbon with a substituted aromatic compound of formula (I) description="In-line Formulae" end="lead"Z(A 1--X1)2 (I)description="In-line Formulae" end="tail" in the presence of a catalyst to fo

A method of making a polyether polymer comprises reacting a salt of a dihydroxy-substituted aromatic hydrocarbon with a substituted aromatic compound of formula (I) description="In-line Formulae" end="lead"Z(A 1--X1)2 (I)description="In-line Formulae" end="tail" in the presence of a catalyst to form an intermediate polymer having endgroups, wherein the molar ratio of the salt of a dihydroxy-substituted aromatic hydrocarbon to the substituted aromatic compound is less than 1, Z is an activating radical, A1 is an aromatic radical and X1 is fluoro, chloro, bromo or nitro; determining the additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon needed to form a final polyether polymer with a predetermined molecular weight and adding the additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon to the intermediate polymer.

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What is claimed is: 1. A method of making a polyether polymer comprising reacting a salt of a dihydroxy-substituted aromatic hydrocarbon with a substituted aromatic compound of formula (I) description="In-line Formulae" end="lead"Z(A 1--X1)2 (I)description="In-line Formulae" end="tail" in the

What is claimed is: 1. A method of making a polyether polymer comprising reacting a salt of a dihydroxy-substituted aromatic hydrocarbon with a substituted aromatic compound of formula (I) description="In-line Formulae" end="lead"Z(A 1--X1)2 (I)description="In-line Formulae" end="tail" in the presence of a catalyst to form an intermediate polymer having endgroups, wherein the molar ratio of the salt of a dihydroxy-substituted aromatic hydrocarbon to the substituted aromatic compound is less than 1, Z is an activating radical, A1 is an aromatic radical and X1 is fluoro, chloro, bromo or nitro; determining the gram moles of endgroups per gram of polymer present on the intermediate polymer; reacting the intermediate polymer with an additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon to form a final polymer having endgroups and a predetermined molecular weight wherein the additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon equals grams of final polymer X (gram moles of end groups per gram of polymer for the intermediate polymer-gram moles of end groups per gram of polymer for the final polymer)/2. 2. The method of claim 1 wherein the dihydroxy-substituted aromatic hydrocarbon has the formula description="In-line Formulae" end="lead"HO--A 2--OH (II)description="In-line Formulae" end="tail" wherein A2 is a divalent aromatic hydrocarbon radical. 3. The method of claim 2 wherein A2 has the formula description="In-line Formulae" end="lead"--A 3--Y--A4--(III)description="In-line Formulae" end="tail" wherein each of A3 and A4 may be a monocyclic divalent aromatic hydrocarbon radical and Y comprises methylene, cyclohexylmethylene, 2-[2.2.1]-bicycloheptylmethylene, ethylene, isopropylidene, neopentylidene, cyclohexylidene, cyclopentadecylidene, cyclododecylidene or adamantylidene. 4. The method of claim 1, wherein the the dihydroxy-substituted aromatic hydrocarbon is bisphenol A. 5. The method of claim 1, wherein the substituted aromatic compound comprises bis(arylene)sulfone, bis(arylene)ketone, tris(arylene) bis(sulfone), tris(arylene)bis(ketone), bis(arylene)benzo-1,2-diazine, bis(arylene)azoxy radical or a bis(ether imide) radical having the formula wherein R8 is a substituted or unsubstituted C6-20 divalent aromatic hydrocarbon radical, or a C2-22 alkylene or cycloalkylene radical. 6. The method of claim 1, wherein the catalyst is a guanidinium salt. 7. The method of claim 1, wherein the intermediate polymer has a weight average molecular weight of about 10,000 to about 40,000. 8. The method of claim 1 wherein the grams moles of end groups per gram of polymer is determined using the equation: absolute number average molecular weight equals 2횞(1-weight fraction of cyclics) /gram moles of endgroups per gram of polymer. 9. The method of claim 8 wherein the absolute number average molecular weight is measured by gel permeation chromatography. 10. The method of claim 8 wherein the weight fraction of cyclics is measured by gel permeation chromatography. 11. The method of claim 1 further comprising monitoring the reaction progress with an in-situ viscosity meter. 12. The method of claim 1 wherein the final polymer has a molecular weight of about 42,000 to about 49,000. 13. The method of claim 1 wherein the final polymer has a molecular weight of about 49,000 to about 60,000. 14. A method of making a polyether polymer comprising reacting a salt of a dihydroxy-substituted aromatic hydrocarbon with a substituted aromatic compound of formula (I) description="In-line Formulae" end="lead"Z(A 1--X1)2 (I)description="In-line Formulae" end="tail" in the presence of a catalyst to form an intermediate polymer, wherein the molar ratio of the salt of a dihydroxy-substituted aromatic hydrocarbon to the substituted aromatic compound is less than 1, Z is an activating radical, A1 is an aromatic radical and X1 is fluoro, chloro, bromo or nitro; determining the molecular weight of the intermediate polymer; calculating the amount of the salt of a dihydroxy-substituted aromatic hydrocarbon used to form the intermediate polymer based on molecular weight achieved and an historical trend of molecular weight versus amount of salt used; determining an additional amount of a salt of a dihydroxy-substituted aromatic hydrocarbon to obtain a final polymer having a predetermined weight from the intermediate polymer wherein the additional amount of equals (amount of salt of dihydroxy-substituted aromatic hydrocarbon needed per amount of final polymer-amount of the salt of a dihydroxy-substituted aromatic hydrocarbon used to form the intermediate polymer per amount of intermediate polymer) X amount of final polymer; reacting the intermediate polymer with the additional amount of the salt of a dihydroxy-substituted aromatic hydrocarbon to form the final polymer. 15. The method of claim 14 wherein the dihydroxy-substituted aromatic hydrocarbon has the formula description="In-line Formulae" end="lead"HO--A 2--OH (II)description="In-line Formulae" end="tail" wherein A2 is a divalent aromatic hydrocarbon radical. 16. The method of claim 15 wherein A2 has the formula description="In-line Formulae" end="lead"--A 3--Y--A4--(III)description="In-line Formulae" end="tail" wherein each of A3 and A4 may be a monocyclic divalent aromatic hydrocarbon radical and Y comprises methylene, cyclohexylmethylene, 2-[2.2.1]-bicycloheptylmethylene, ethylene, isopropylidene, neopentylidene, cyclohexylidene, cyclopentadecylidene, cyclododecylidene or adamantylidene. 17. The method of claim 14, wherein the the dihydroxy-substituted aromatic hydrocarbon is bisphenol A. 18. The method of claim 14, wherein the substituted aromatic compound comprises bis(arylene)sulfone, bis(arylene)ketone, tris(arylene) bis(sulfone), tris(arylene)bis(ketone), bis(arylene)benzo-1,2-diazine, bis(arylene)azoxy radical or a bis(ether imide) radical having the formula wherein R8 is a substituted or unsubstituted C6-20 divalent aromatic hydrocarbon radical, or a C2-22 alkylene or cycloalkylene radical. 19. The method of claim 14, wherein the catalyst is a guanidinium salt. 20. The method of claim 14, wherein the intermediate polymer has a weight average molecular weight of about 10,000 to about 40,000. 21. The method of claim 14 further comprising monitoring the reaction progress with an in-situ viscosity meter. 22. The method of claim 14 wherein the final polymer has a molecular weight of about 42,000 to about 49,000. 23. The method of claim 14 wherein the final polymer has a molecular weight of about 49,000 to about 60,000.