The graft reaction of succinic anhydride onto poly(vinyl alcohol) (PVA) was catalyzed by p-toluenesulfonic acid monohydrate in solid state. The infrared spectra and 1 H-NMR spectra confirmed that succinic anhydride was successfully grafted onto PVA backbone. The influences of reaction temperature, reaction time, the amount of succinic anhydride, and the amount of catalyst on the graft reaction were studied. Uncrosslinked PVA graft copolymer with grafting degree up to about 6.5% could be obtained under low reaction temperature, short reaction time, and low amount of catalyst, whereas crosslinked PVA with high gel content could be obtained under high reaction temperature, long reaction time, and high amount of catalyst.
When the content of Al2O3 was higher than 50 wt%, the tensile strength of KH-331 modified Al2O3/PA6 composites decreased, but the tensile strength of MEKO blocked isocyanate-propyltriethoxy silane modified Al2O3/PA6 composites increased.
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