We have investigated C8H17-benzylidene-C6H13-oxipyrimidine-based SmC textures on the surface of two polyimides : I-poly-(4,4’-oxybiphenylene) piromillitamide acid, and II-poly-4,4’-[2,2’-bis-4(4’-aminophenoxy) phenylpropyl]-biphenyloxytetracarbonic acid. Polarized microscopic textures SmC on the above mentioned compounds differ greatly : the texture of SmC on the polyimide I is of "Chevron" type, and the texture of SmC on the polyimide II is of "microfan" type. Calculations of the intermolecular interaction energies enable to determine the nature of texture difference.