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Poly(vinyl alcohol) (PVA) was successfully reinforced by castor oil based waterborne polyurethane ionomer (PUI) synthesized from castor oil, dimethylolpropionic acid, 4,4′-methylenediphenyl diisocyanate, and triethylamine. The average diameter of PUI determined by dynamic light scattering and transmission electron microscope was around 45nm. The size of dispersed PUI in PVA/PUI composite was in the...
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