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In this example, a triblock copolymer (PAN-PEO-PAN) consisting of polyethylene oxide (PEO) chain and polyacrylonitrile (PAN) chains is synthesized by living anion polymerization. Using a polyethylene oxide macromer (disodium salt of polyethylene oxide) as a reaction initiator, acrylonitrile is polymerized. Tetrahydrofuran and benzene used as solvents are distilled twice using lithium aluminum hydride as a desiccating agent under an argon gas flow, to which molecular sieves 4A is charged. The acrylonitrile employed as a monomer is washed successively with a saturated aqueous solution of NaHSO3, a saturated aqueous solution of NaCl containing 1% of NaOH, and a saturated aqueous solution of NaCl, and then vacuum-distilled using calcium chloride as a desiccating agent, and further vacuum-distilled using calcium hydride as a desiccating agent under an argon gas flow, to which molecular sieves 4A is charged. Sodium naphthalene is prepared by reacting naphthalene with metallic sodium in THF. Crown ether (dicyclohexyl-18-crown-6) is freeze-dried from a solution in benzene, and then is dissolved in benzene. Polyethylene oxide, which has OH groups at both ends, is freeze-dried from a solution in benzene immediately before use. As for the polymerization apparatus, a pressure reactor (Taiatsu Glass Co., Ltd.) is employed. The reaction is carefully performed in an argon atmosphere under pressure of 4 atm so as to prevent an external air from entering the interior of the reaction system.

1. customis synthesized
2. customanion polymerization
3. customis polymerized
4. distillationare distilled twice using lithium aluminum hydride as a desiccating agent under an argon gas flow
5. additionto which molecular sieves 4A is charged
6. washis washed successively with a saturated aqueous solution of NaHSO3
7. distillationa saturated aqueous solution of NaCl containing 1% of NaOH, and a saturated aqueous solution of NaCl, and then vacuum-distilled
8. distillationfurther vacuum-distilled
9. additionto which molecular sieves 4A is charged
10. dry with materialCrown ether (dicyclohexyl-18-crown-6) is freeze-dried from a solution in benzene
11. dissolutionis dissolved in benzene
12. dry with materialis freeze-dried from a solution in benzene immediately before use