TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The transition-metal catalyst is a zerovalent palladium catalyst.The base comprises sodium carbonate, potassium carbonate, cesium carbonate, or cesium fluoride.The acid for removing amino from the diaminoboranes is sulfuric acid or hydrochloric acid.Preferred Ratio: The mole ratio of the zerovalent palladium catalyst and the bromo-diaminoboranes is 0.03-0.05:1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The borate comprises trimethyl borate, or tri-iso-propyl borate.The solvent comprises a mixture of water, and toluene or tetrahydrofuran.The solvent is tetrahydrofuran or dichloromethane.Preferred Ratio: The mole ratio of the base and the bromo-diaminoboranes is 1-5:1.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): Preparation of oligopolymer (I) comprises adding n-butyllithium to a tetrahydrofuran solution of 1,2-di(4-bromophenyl)hexafluorocyclobutane under an atmosphere of inert gases, reacting for 1-2 hours, adding borate and reacting for 6-12 hours at - 65 to - 80 degrees C, restoring to room temperature and acidifying by adding hydrochloric acid solution, and separating to obtain a bromo-boric acid, where the mole ratio of the n-butyllithium and the 1,2-di(4-bromophenyl)hexafluorocyclobutane is 1-1.2:1, mole ratio of the borate and the 1,2-di(4-bromophenyl)hexafluorocyclobutane is 1.5-3: 1; refluxing the bromo-boric acid and 1,8-diaminonaphthalene for 2-12 hours in a solvent and under an atmosphere of inert gases, removing generated water while reacting, and separating and purifying to obtain bromo-diaminoboranes, where mole ratio of the bromo-boric acid and the 1,8-diaminonaphthalene is 1:1-1.5, and the reaction solvent is toluene or xylene; subjecting aryl boric acid of formula (4) and the bromo-diaminoboranes to Suzuki coupling reaction under an atmosphere of inert gases, separating, and purifying to obtain diaminoboranes of formula (5), where the mole ratio of the aryl boric acid (4) and the bromo-diaminoboranes is (1-5):1; reacting the diaminoboranes (5) with excessive acid for 12-24 hours to remove amino, separating and purifying to obtain a boric acid of formula (6), and subjecting to Suzuki coupling reaction; and reducing obtained diaminoboranes (5) to boric acid, re-subjecting the boric acid and the bromo-diaminoboranes to Suzuki coupling reaction, reducing to boric acid again, and repeatedly subjecting the boric acid and the bromo-diaminoboranes to a reaction for Suzuki coupling and for removing amino, in which one perfluorocyclobutyl ether unit is introduced.Preferred Method: The Suzuki coupling reaction is carried out under the effect of a solvent and a base.