TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The alkali solution is aqueous solution of sodium carbonate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Processes: The boron-containing compound (A) is prepared by mixing N,N-bis(4-bromophenyl)-N-phenylamine derivative of formula (III) in tetrahydrofuran, cooling at (-78) degrees C, adding n-butyllithium and 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, reacting at room temperature for overnight, obtaining reaction mixture, separating the obtained reaction mixture and purifying. The molar ratio of N,N-bis(4-bromophenyl)-N-phenylamine derivative and n-butyllithium is 1:2. The molar ratio of N,N-bis(4-bromophenyl)-N-phenylamine derivative and 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane is 2:1. The compound (B) is prepared by dissolving 7-bromo-4-(7-bromo-5-iodo-2,1,3-benzothiadiazol-4-yl)-5-iodo-2,1,3-benzothiadiazole in dimethylformamide and acetylene group-containing compound of formula: R2-CC-R1, adding tributylamine and palladium acetate and cyclizing under anaerobic condition. The molar ratio of 7,7'-dibromo-5,5'-diiodo-4,4'-bi-2,1,3-benzothiadiazole and acetylene group-containing compound is 1:2. The molar ratio of acetylene group-containing compound, tributylamine and palladium acetate is 20:20:1. The 7-bromo-4-(7-bromo-5-iodo-2,1,3-benzothiadiazol-4-yl)-5-iodo-2,1,3-benzothiadiazole is prepared by mixing 7-bromo-4-(7-bromo-5-nitro-2,1,3-benzothiadiazol-4-yl)-5-nitro-2,1,3-benzothiadiazole and tin (II) chloride in molar ratio of 1:10, performing reduction reaction at 100 degrees C for 10 hours, obtaining reaction mixture (A), adding hydrochloric acid to the resultant reaction mixture and performing diazotization reaction at less than 5 degrees C for 30 minutes using potassium iodide. The molar ratio of 7,7'-dibromo-5,5'-bis(dihydroxyamino)-4,4'-bi-2,1,3-benzothiadiazole and hydrochloric acid is 0.92:1. The molar ratio of 7,7'-dibromo-5,5'-bis(dihydroxyamino)-4,4'-bi-2,1,3-benzothiadiazole and potassium iodide is 0.054:1. The 7-bromo-4-(7-bromo-5-nitro-2,1,3-benzothiadiazol-4-yl)-5-nitro-2,1,3-benzothiadiazole is prepared by coupling 4-bromo-6-nitro-2,1,3-benzothiadiazole by copper powder in molar ratio of 0.2:1, at 120 degrees C for 3 hours. The reaction solution obtained by performing Suzuki coupling reaction is added to deionized water, extracted with toluene, the resultant organic phase was distilled under reduced pressure and precipitating. Ethanol is added to resultant precipitate, mixed, filtrated and dried, to obtain dry powder. The obtained powder is dissolved in chloroform, separated by performing silica gel column chromatography and liquid chromatography, then distilled under reduced pressure with methanol and filtered. The resultant resulting solid is extracted with acetone in a Soxhlet extractor for three days, sedimentation is carried out with methanol, filtered under vacuum for overnight to obtain solution containing triphenylamine-benzothiadiazole copolymer.R3=H, 1-20C alkyl or 1-8C alkoxy;andR1,R2=1-20C alkyl.Preferred Composition: The molar ratio of 4-nitrobenzene-1,2-diamine and thionyl chloride is 1.5:1 mol/mL. The volume ratio of thionyl chloride and pyridine is 50:1. The catalyst is tetrakis(triphenylphosphine)palladium. The addition amount of the catalyst is 0.05-20 wt.%. The organic solvent is tetrahydrofuran, ethylene glycol dimethyl ether, benzene or toluene.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): The triphenylamine-benzothiadiazole-containing copolymer is prepared by mixing boron-containing compound (A) and 8,15-dibromo-5,18-dithia-4,6,17,19-tetraazapentacyclo(11.7.0.02.10.03.7.016.20)icosa-1(13),2(10),3,6,8,11,14,16,19-nonaene compound of formula (B) in organic solvent, adding alkali solution and catalyst and performing Suzuki coupling reaction at 50-120 degrees C for 6-108 hours under inert gas atmosphere.n=1-100.