The Study Of Modified Polyacrylates With Polysiloanes In The Comb-like Polymers

Polysiloanes posses a variety of unique and superior properties such as low temperature resistance ,low surface energy, good water resistance, aging resistance, climate resistance and so on. Polysiloanes can endow other polymers with the excellent properties so that new polymer materials can be obtained. In this theis two different types of polysiloanes were synthesized to conpolymerize with other acrylate monomers in emulsion and the properties of modified polyacrylates with polysiloanes were simply studied.An organosilicone oligomer, which has three siloxane chains and a double bond at one of its ends, was synthesized from trimethy chlorosilane,γ-methylacryloylorg- anosiloxane (KH-570) and octamethyl cyclotetrasiloxane (D4). The terminal double bond enables it to conpolymerize with other acrylate monomers in emulsion, therefore gives out a comb-like structured polymer. This polymer are characterized by 1H NMR, FT-IR, XPS, and AFM. The result of XPS shows that the ratio of C to Si in the surface of the polymer film is 2.24:1, almost the same as that in the organosilicone oligomer. The contact angle could reach 105°. All these dates indicates an increase of surface water resistance.The fluoro-siloxane polyacrylate latex, which was obtained by seed emulsion polymerization of acrylate with organosilicone oligomer (MAPT-PDMS) and 2,2,2-Trifluoroethyl methacrylate as modifiers. The efficient crosslinking structure was formed due to the MAPT-PDMS in formation process of the film. Consequently, the water and solvent.Resistance properites of flim were dramatically improved.The surface energy of films was reduced due to the order arrangement of fluorocarbon chain of 2,2,2-Trifluoroethyl methacrylate on the flim surface, and therefore, the water and oil repellency properties of film was significantly increased. In addition, The contact angle finished by this emulsion exhibited good water repellency property.An organosilicone oligomer with Pyrene (MAPT-PDMS), which has fluorescence and a double bond at one of its ends, was synthesized from Pyrene, 6-bromohexanoyl chloride, allyl methacrylate, dimethylchlorosilane, hexamethylcyclotrisiloxane (D3). The terminal double bond enables it to conpolymerize with other acrylate monomers in emulsion, therefore gives out a comb-like structured polymer. This polymer are characterized by FT-IR. the fluorescence properties of modified polyacrylates with PY-PDMS and the fluorescence quenching of the films upon exposure to nitro compounds were studied.