TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The radically polymerizable monomer is chosen from methyl methacrylate, n-butyl methacrylate, 2-hydroxyethyl methacrylate, polyethylene glycol methacrylate, styrene and acrylonitrile. The electrolyte solution is propylene-carbonate solution or ethylene carbonate solution of lithium hexafluorophosphate or lithium tetrafluoroborate.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): A cyclic compound of formula (V) and linear compound of formula: -X3-R3-N+H2-R4-X4-.Z- (VI) are reacted, and the resultant product is polymerized, to obtain network polymer containing skewered-form unit (A). Alternatively, cyclic compound of formula (VII) and linear compound (VI) are reacted and the resultant product is polymerized, to obtain network polymer containing skewered-form unit (A).X1,X2=group which acts as bond-region during polymerization reaction, or group which does not act as bond-region during polymerization reaction;andX3,X4=group which acts as bond-region during polymerization reaction.(i) when n2 is 1, group on X1 and X2 act as bond-region during polymerization reaction. Preferred Composition: The molar ratio of unit (A) and unit (B) is 1/1-1/100. The partial structure (I) is structure of formula (III). The partial structure (II) is structure of formula: -(CH2)y-C(=O)-O-CH2-CH2-N+H2-CH2-CH2-O-C(=O)-(CH2)y-.Z- (IV). The network polymer containing skewered-form unit (A) formed by partial structure (II) is reacted with electrophilic agent, in which partial structure (II) is converted into partial structure (II').m=1-13;dotted line=portion bonding with 3rd-position or 4th-position of benzene ring;andy=1-12. EXAMPLE - Triethylene glycol monotosylate and tert-butyl-N,N-bis(2-hydroxyethyl)carbamate were polymerized in presence of benzylidene-bis(tricyclohexylphosphine)dichloro ruthenium as catalyst, stirred at 40 degrees C for 24 hours, ethyl vinyl ether was added and the resultant product was washed with dichloromethane and dimethylformamide, to obtain network polymer having skewered-form unit.