ORDERED STRUCTURES OF POLY(1H,1H,2H,2H-PERFLUORODECYL ALPHA-SUBSTITUTED ACRYLATE)S

Ordered structures of poly(1H,1H,2H,2H-perfluorodecyl alpha-fluoroacrylate) (P17FF), poly(alpha-chloroacrylate) (P17FC), poly(methacrylate) (P17FM) and poly(acrylate) (P17FA) were investigated by X-ray diffraction, DSC and polarizing microscopic observations. At room temperature, both P17FF and P17FC prefer the layered structure of single-layer packing of the fluoroalkyl side chains, while P17FM contains both single-layer and double-layer packing, and P17FA forms double-layer packing. As temperature increases, particularly in P17FF and P17FC, there was observed a structural rearrangement of the single-layer packing to double-layer one accompanied by melting of the side chain crystallites, which may come from an intermolecular interaction between the main chains caused by polar effect of the alpha-substituents.