NOVELTY - A polymer (p1), a monomer of the polymer comprising: a bi-triphenylamine functional group having a first end and a second end; a fluorene functional group bonded to the first end; and at least two phenyl isopropyl group bonded to the second end is new.    USE - For preparation of copolymer (claimed) for applying to windows of buildings, indicators, electrochromic displays or smart windows; thin film materials e.g. organic light emitting diodes, solar cells, photoreceptors, luminaries or electroluminescent devices.    ADVANTAGE - The polymer and the copolymer have good solubility, good heat tolerance, high carrier mobility and low ionization potential; have good optical properties and good electron donating group properties. The absorption of the copolymer of the UV-vis spectroscopy is shifted toward long wavelength and thus the absorption efficiency increases. The polymer is able to form thin films easily; is applied to electrochromic materials because the nitrogen atom in the center of it has oxidation and reduction ability, so as to be able to be applied to windows of buildings, indicators, electrochromic displays or smart windows; is applied to hole-transporting materials because the nitrogen atom in the center of its triphenylamine functional group is easy to lose electrons, so as to be able to be applied to thin film materials e.g. organic light emitting diodes, solar cells, photoreceptors, luminaries or electroluminescent devices.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) new copolymer of formula (I);    (2) preparation (M1) of the polymer (p1); and    (3) preparation (M2) of the copolymer involving: i) preparing a dibromobenzene compound, fluoreneboronic acid compound, dibromothiophene compound, potassium carbonate solution and toluene solution and placing the solution mixture into a reaction vessel filled with nitrogen; ii) adding tetrakis(triphenylphosphine)palladium into the reaction vessel and heating the solution mixture to a first predetermined temperature and refluxing the solution mixture for a first predetermined time; iii) depositing and filtering the copolymer in a methanol solution and washing the copolymer with a great amount of water; and iv) heating the copolymer under vacuum to a second predetermined temperature and drying the copolymer for a second predetermined time.    R=C8H17 to C12H25;    x=0.05-0.15;    y=1;    z=0.85-0.95.