Agency for Science, Technology and Research

Ming Yan Tan

Xu Li

Yu Zhang

Siew Yee Wong

Xi Kui Zhang

A method of forming a titania-coated inorganic particle comprising the steps of: (a) agitating a mixture of inorganic particle and organic solvent; (b) adding titania precursor dropwise into the mixture of step (a) under agitation; and (c) adding catalyst to the mixture of step (b) thereby converting said titania precursor to titania which then forms a coating on said inorganic particle; wherein steps (a) to (c) are performed at neutral pH and ambient temperature.

Methods for forming and uses of titania-coated inorganic particles

A method of synthesizing a polymeric clay composition for coating. A clay-polyacrylate composite is produced, where the clay-polyacrylate composite includes one or more layers of clay intercalated with polyacrylate, where the one or more layers of clay include at least one organosilane coupling agent including an acrylate moiety, where the at least one organosilane coupling agent is attached to a surface of the one or more layers of clay and the polyacrylate is covalently attached to the organosilane coupling agent, and where the polyacrylate consists of a first acrylate monomer and a second acrylate monomer having different solubility, where the first acrylate monomer is a hydrophilic acrylate monomer including a hydroxyl (&#x2014;OH) group and the second acrylate monomer is a hydrophobic acrylate monomer which repels water. Furthermore, the clay-polyacrylate composite is mixed with a solution including a polymer to form the polymeric clay composition.

Clay-polyacrylate composites suspension via in situ polymerization

A method of synthesizing a clay-polyacrylate composite. An aqueous solution including clay is mixed with at least one organosilane coupling agent including an acrylate moiety to form a silanized-clay suspension. The silanized-clay suspension is contacted with a first acrylate monomer and a second acrylate monomer in an inert environment, where the first acrylate monomer and the second acrylate monomer have different solubility. A polymerization initiator is added to the silanized-clay suspension before or during the contacting of the silanized-clay suspension with the first acrylate monomer and the second acrylate monomer in the inert environment to form the clay-polyacrylate composite including the first and second acrylate monomer, where the first acrylate monomer is a hydrophilic acrylate monomer including a hydroxyl (&#x2014;OH) group and the second acrylate monomer is a hydrophobic acrylate monomer which repels water.

The present disclosure relates to a clay-polyacrylate composite comprising layers of clay intercalated with polyacrylate, wherein the layers of clay comprises at least one organosilane coupling agent comprising an acrylate moiety; and wherein the polyacrylate comprises a first acrylate monomer and a second acrylate monomer having different solubility. A surfactant-free method of synthesizing the said clay-polyacrylate composite and a method for coating are also provided. In a preferred embodiment, the first acrylate monomer is a hydrophilic acrylate monomer, e.g. 2-hydroxyethyl acrylate, and the second acrylate monomer is a hydrophobic acrylate monomer, e.g. 2-ethylhexyl acrylate. The clay-acrylate composite can be used for forming a barrier coating, which exhibits low water and low oxygen permeability.

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Singapore, Singapore

Ming Yan Tan