Studies of surface functional modification of nanosized α-alumina

✍ Scribed by Hongyan Li; Yan Yan; Bin Liu; Wei Chen; Shoutian Chen

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 381 KB
• Volume: 178
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2007.04.020

✦ Synopsis

Surface functional modification of nanosized α-alumina is an effective way to improve its dispersion in polymer and to enhance interfacial agglutinate force between particles and polymer. In this paper, diphenylmathane-4,4'-diisocyanate(MDI) was used as a surface grafting agent to react with the hydroxyl group on the surface of nanosized α-alumina. The surface properties of the grafted α-alumina were studied by FT-IR spectra X-ray photoelectron spectroscopy(XPS), surface tensiometer and transmission electron microscope (TEM). It was found that the reaction between the isocyanate group and the hydroxyl group on the surface of α-alumina nanoparticles was attribute to additional reaction of the double bond between C and N in the isocyanate group. The surface of MDI grafted α-alumina nanoparticles showed an extremely hydrophobic property and good dispersibility in ethanol. The most important influence was that there was a quantity of isocyanate groups with an active chemical property on the surface of the grafted particles, which could readily react with compounds containing -OH, -NH 2 or -COOH groups.