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The chemical reaction between polyvinyl alcohol (PVA) and tri(dioctylpyrophosphoryloxy) isopropyl titanate (NDZ-201) was studied using X-ray photoelectron spectroscopy (XPS).The results show that some C-OH functional groups of PVA react with the titanate coupling agent to form C PVA-O-Ti-O-C PVA bond.The cross-linking of the PVA chains occurs through the formation of C PVA-O-Ti-O-C PVA bonds and produces a three dimensional hydrophobic polymer network.Accordingly,the mechanism is proposed that the titanate coupling agent improves the moisture sensitivity of high alumina cement/polyvinyl alcohol (HAC/PVA) based macro defect free (MDF) composite material.
The chemical reaction between polyvinyl alcohol (PVA) and tri (dioctylpyrophosphoryloxy) isopropyl titanate (NDZ-201) was studied using X-ray photoelectron spectroscopy (XPS). The results show that some C-OH functional groups of PVA react with the titanate coupling agent to form C PVA-O-Ti-OC PVA bond. The cross-linking of the PVA chains occurs through the formation of C PVA-O-Ti-OC PVA bonds and produces a three dimensional hydrophobic polymer network. Accreditedly, the mechanism is proposed that the titanate coupling agent improves the moisture sensitivity of high alumina cement / polyvinyl alcohol (HAC / PVA) based macro defect free (MDF) composite material.