Polymer exfoliated phyllosilicate nanocomposite compositions and a process for the preparation thereof
AssigneeCouncil of Scientific and Industrial Research
InventorsShroff Rama Mallikarjuna, Swaminathan Sivaram
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Abstract
The present invention provides a polymer-phyllosilicate nanocomposite composition comprising (a) 10-99.95% by weight of a matrix polymer and (b) 0.05-90% by weight of a phyllosilicate selected from the group consisting of hydrophilic synthetic phyllosilicates and natural phyllosilicates intercalated with a modifier, an alkylonium ion having reactive moiety. The phyllosilicate is substantially homogeneously dispersed and/or exfoliated throughout the polymer matrix as nanosized particles and the alkylonium ion is substantially covalently linked to the matrix polymer chains. The present invention further provides a process for the preparation of polymer-phyllosilicate nanocomposite.
Claims44
A polymer-phyllosilicate nanocomposite composition comprising
- (a) 10-99.95% by weight of a matrix polymer and
- (b) 0.05-90% by weight of a phyllosilicate selected from the group consisting of hydrophilic synthetic phyllosilicates and natural phyllosilicates intercalated with a modifier, an alkylonium ion having reactive moiety.
A process for the preparation of polymer-phyllosilicate nanocomposite composition comprising the steps of
- (a) mixing 10-99.95% by weight of a matrix polymer and 0.05-90% by weight of a phyllosilicate selected from the group consisting of hydrophilic synthetic phyllosilicates and natural phyllosilicates intercalated with a modifier and an alkylonium ion having reactive moiety,
- (b) intercalating a layered silicate material by contacting it with alkylonium ions having reactive group to obtain the intercalated layered material,
- (c) mixing the above said intercalated layered material with a melt of the matrix polymer, under stirring, to intercalate and exfoliate the said matrix polymer between adjacent platelets of the layered silicate material to obtain the desired polymer-exfoliated phyllosilicate nanocomposite composition.
A process for the preparation of polymer-phyllosilicate nanocomposite comprising the steps of
- (a) mixing 40% to 99.95% by weight of a matrix polymer and about 0.05% to about 60% by weight of an intercalate and/or exfoliate,
- (b) intercalating and/or exfoliating a layered silicate material by contacting the layered silicate material with alkylonium ions having reactive moiety to exchange the alkylonium ions having reactive moiety for at least a portion of the interlayer exchangeable cations of the layered material,
- (c) mixing the above said intercalated layered silicate material with one or more monomer or oligomer reactants and subjecting it to conditions sufficient to polymerize the said monomer or oligomer reactants to form said matrix polymer.
A process for the preparation of polymer-phyllosilicate nanocomposite comprising the steps of
- (a) contacting a layered silicate material with alkylonium ions having reactive moiety to intercalate the alkylonium ions having reactive moiety between the adjacent layers of said layered silicate material,
- (b) increasing the spacing between adjacent layers of the layered material at least 3 Å, simultaneously or subsequently contacting the above said intercalated layered silicate material with a solution or dispersion of an oligomer or polymer to intercalate the oligomer or polymer between the adjacent layers of the said layered silicate material to expand the spacing between the adjacent layers at least an additional 3 Å, and
- (c) mixing the layered silicate material, having said alkylonium ions having reactive moiety and said oligomer or polymer intercalated between adjacent layers and/or exfoliated, with an oligomer or polymer matrix material.
A polymer-phyllosilicate nanocomposite composition and a process for the preparation thereof substantially as herein described with reference to the examples.
Dependencies are inferred from the claim text.