PTMG-g-HFP And Fluorine-containing Polyurethane Synthesis, Characterization And Performance

Due to their excellent mechanical properties, curing at low temperature, high adhesion, and high resistance to water, solvents and low temperature, polyurethane(PU) have been widely applied in many fields and daily lives. However, with the development and progress of society, higher and newer requirements of protective and ornamental especially to wear have been presented. Original PU materials have showed insufficiency and their use have been limited in the face of these requirements. Fluorinated polyurethane (FPU), as a species of novel macromolecule functional materials, owing to the introduction of fluorinated groups, have very lowest surface energy, excellent resistance to chemicals water and oils. Therefore, FPU have supplied original PU gap in the above mentioned shortages. In this dissertation, the intermediate of FPU, i.e. a novel fluorinated polyether glycol were synthesized via the radical grafting. At the same time, the synthesis technics and reaction mechanism were studied and discussed. FPU were successfully prepared with the fluorinated polyether glycol as intermediate. The bulk and surface structures of FPU and properties were investigated, and the relation between the structures and properties were discussed preliminarily.1. A new fluorinated polyether glycol (PTMG-g-HFP) was prepared by radical grafting of hexafluoropropylene (HFP) onto polytetramethylene glycol (PTMG) in the presence of different initiators by radical grfting. The structure of PTMG-g-HFP was characterized by means of IR, ¹H NMR and ¹³C NMR. The effects of the nature and amount of initiator, reaction time and temperature on the grafting HFP onto PTMG were investigated. The measured hydroxyl values of PTMG-g-HFP were lower than theoretical values. Therefore, a new protection-graft-deprotection procedure was designed. The prepartion of PTMG-g-HFP was improved and perfected via the procedure. By the comparison of acetylation and silylation protection hydroxyl methods, it was found, though the hydroxyl of PTMG had been totally protected by the optimal reaction conditions with two protection methods, the acetylated protective groups were hard to be totally deproected and the silylated protective groups were...