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- W2164299459 abstract "The hydrogen bonds in films of the polyurethane and the core-shell type polyacrylate-polyurethane microemulsions have been studied by FTIR spectroscopy in the regions of NH absorption and CO absorption. The effects on hydrogen bonds of the composition, the core-shell ratio were revealed. At the same time, the relationship between the hydrogen bonds and the crosslinked structures (Type A and Type B) was discovered. The shifts of the NH and CO stretching bands to higher frequencies and the shift of NH bending bands to lower frequencies, with the increase of acetone CO number in the core, mean that the hydrogen bonds between the soft and hard segments, and those in the short-range order in the hard segment phase, are broken. The dipole/dipole interaction which is supposed to exist between the acetone CO groups in the core and the urethane CO in the shell can change the hydrogen bond distribution in the shell, and at the same time, lead to hydrogen bonds between acetone CO in the core and the urethane NH in the shell. Type A and B crosslinked structure between the core and the shell located at the interface of the core and the shell can confine the acetone CO within the crosslinking network, and Type B crosslinked structure also decreases the acetone CO numbers. These weaken the dipole/dipole interaction between the acetone CO and the urethane CO, and lead to the decrease of the effect of the acetone CO groups on the hydrogen bond distribution in the shell. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 2642–2650, 1999" @default.
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- W2164299459 date "1999-09-15" @default.
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- W2164299459 title "IR spectra studies of core-shell type waterborne polyacrylate-polyurethane microemulsions" @default.
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- W2164299459 doi "https://doi.org/10.1002/(sici)1099-0488(19990915)37:18<2642::aid-polb8>3.0.co;2-d" @default.
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