Spectroscopic Investigations of Poly(oxypropylene)glycol-Based Waterborne Polyurethane Doped with Lithium Perchlorate

Abstract

Polyaddition of isophorone diisocyanate to poly(oxypropylene)glycol (PPG)-Based waterborne polyurethane (WPU) synthesized by a modified acetone process was performed. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), and impedance spectroscopy (IS) were utilized to monitor the phase change of this WPU with the doped lithium perchlorate (LiClO4) concentration. Significant changes occur in the FTIR spectrum of the WPU with the added salt concentration above 1 mmol/g WPU, indicating that an interaction with the lithium cation within the hard segment and between the hard and soft phases occurs. The soft segment T g increases with increasing LiClO4 through the examination of DSC. XPS results reveal that the component of nitrogen polaron sites (N+) increases with increasing LiClO4 and that the saturation level of salt doping is evidenced by the mole ratio of component C−O to CO; meanwhile, a rearrangement in the long chain of the soft domain has also been observed when this WPU is doped with LiClO4. IS results indicate an increase in bulk conductivity as the salt concentration is increased.

Enhanced mechanical performances of waterborne polyurethane loaded with lignosulfonate and its supramolecular complexes

“…29) and the band of free À ÀC¼ ¼O at 1726 cm 21 . 30,31 Obviously, the free À ÀNH band of the WLS films prepared by two methods became stronger after adding LS, and even its intensity increased with increasing LS content. It suggested that the added LS destroyed the original hydrogen bonds in pure WPU component while high LS content might boost the damage extent.…”

Hybrid thin films derived from UV-curable acrylate-modified waterborne polyurethane and monodispersed colloidal silica

“…To a 1000 ml four-necked round bottomed flask complete with an anchor-propeller stirrer 7 cm in length and 2 cm in width, a nitrogen inlet and outlet, and a thermometer, 4,4-methylenebis-(cyclohexyl isocyanate) (H 12 MDI, Aldrich, USA) (95 g; 0.362 mol) was charged under a nitrogen gas atmosphere, and a solution of polyester polyol (113.87 g; 0.175 mol) and dimethylolpropionic acid/dimethylformamide (DMPA/DMF = 10 g/25 g, Merck, Germany) was then added over a period of 0.5 h under gentle stirring (300 rpm). The mixture was heated at 100°C until the theoretical NCO content of the prepolymer was reached as determined by the di-nbutylamine titration method [26][27]. 2-Hydroxylethylacrylate (2-HEA, 15 g) was then added to react with the above NCO-terminated PU prepolymer.…”

Waterborne polyurethane single-ion electrolyte from aliphatic diisocyanate and various molecular length of polyethylene glycol

“…The central peak (peak 2) is N-H stretching which is affected by hard-soft segment H-bonding (about 3430 cm -1 ). The frequency shift of H-bonded N-H stretching represents the stretching of H-bonding in polyurethane [13,16]. The area of each band was determined by using the Nelder-Mead optimization method.…”

“…Knowing this, in designing a novel polymer of similar PEO structure, it is reasonable to react PEG with diisocyanate to form PEG-based polyurethane (PU), because PU polymer possesses high tensile strength, elasticity as well as low crystallinity. In our laboratory, a series of studies [10][11][12][13][14] have been performed for the polymer electrolytes on the basis of waterborne polyurethane (WPU). Polyurethanes are composed of polyether or polyester soft segment and a diisocyanate-based hard segment, which can be characterized by a twophase morphology [13].…”

“…In our laboratory, a series of studies [10][11][12][13][14] have been performed for the polymer electrolytes on the basis of waterborne polyurethane (WPU). Polyurethanes are composed of polyether or polyester soft segment and a diisocyanate-based hard segment, which can be characterized by a twophase morphology [13]. The phase separation is due to the fact that the hard and soft phases are immiscible and leads to the formation of a hardsegment domain, a soft-segment matrix, and an illdefined inter-phase.…”