Syndiotactic polystyrene nanocomposite and manufacturing method thereof
The syndiotactic polystyrene nanocomposite according to the present invention has nano silicate materials dispersed individually in a styrene polymer matrix by intercalation and exfoliation during polymerization. Besides, the syndiotactic polystyrene nanocomposite according to the present invention is prepared by using a catalytic system composed of a phyllosilicate-supported Group IVB transition metal catalyst and alkylaluminoxane, wherein the phyllosilicate-supported Group IVB transition metal catalyst comprises: a) a polymer, b) a phyllosilicate and c) a Group IVB transition metal compound, and the polymer (a) is used as an insulating material or media of the phyllosilicate (b) and the Group IVB transition metal compound (c).
1. A process of preparing a syndiotactic polystyrene nanocomposite, which comprises (A) contacting (a) a polymer having a polar group, (b) a nano phyllosilicate, and (c) a Group IVB transition metal compound to form a phyllosilicate-supported Group IVB transition metal compound and (B) polymerizing styrenic monomers under a catalyst system composed of the phyllosilicate-supported Group IVB transition metal compound and an alkylaluminoxane, wherein the polymer(a) insulates the Group IVB transition metal compound (c) from the surface of the phyllosilicate (b) such that the Group IVB transition metal compound (c) does not react with the surface of the phyllosilicate (b).
2. A process of preparing a syndiotactic polystyrene nanocomposite, which comprises (A) contacting (a) a polymer having a polar group, (b) a nano phyllosilicate, (c) a Group IVB transition metal compound, (d) an alkylaluminoxane, and (e) an alkylaluminum compound to form a phyllosilicate-supported Group IVB transition metal compound and (B) polymerizing styrenic monomers under a catalyst system composed of the phyllosilicate-supported Group IVB transition metal compound and an alkylaluminoxane, wherein the polymer(a) insulates the Group IVB transition metal compound (c) from the surface of the phyllosilicate (b) such that the Group IVB transition metal compound (c) does not react with the surface of the phyllosilicate (b).
3. The process in claim 1 , wherein said polymer (a) is harmless to the catalysis, interacts with the catalyst and surface of the support chemically or physically; and is insoluble in styrenic monomer or polymerization solvent after loading a catalyst.
4. The process of claim 1 wherein said polymer (a) containing a polar group is selected from the group consisting of an acrylonitrile-containing polymer or copolymer, a hydroxyl group-containing polymer or copolymer, an acrylic or acrylate polymer or copolymer, a maleic anhydride-containing copolymer, an acetate-containing polymer or copolymer, a polyether polymer or copolymer, a polyketone polymer or copolymer, and a polyamide polymer or copolymer.
5. The process in claim 4 , wherein said acrylonitrile-containing polymer is poly(styrene-co-acrylonitrile)(SAN) having a degree of polymerization of at least 5 and an acrylonitrile content in the polymer of 0.1 to 100 wt %.
6. The process of claim 1 , wherein said polymerization is melt mixing polymerization.