The Solubility Of Modified Poly(Propylene Oxide) And Silicone In Supercritical Carbon Dioxide And UV-Curing Of Functional Monomer

This paper is separated into two parts. The first part is the solubility of modified poly(propylene oxide)(PPO) and silicone in supercritical carbon dioxide; and the second part is the preparation and UV-Curing of functional monomer.The functional PPOs were prepared by modification of PPO using trimethlysily, acetly as end blocked group. In addition, several poly(ethylene glycol) ( PEG ) modified hydrogen-containing silicone oil (SiH) supported phosphine were synthesized. The solubility of those modified PPO and silicone have been investigated by measuring their cloud point pressure in supercritical CO2. The solubility of PPO is strongly affected by its end group and molecular weight. The modified silicone is generally more soluble than polyether. Hydroxyl silicone oil (SiOH) segment can increase solubility of phosphine ligand of Ph2P-DB570-SiOH(1:3) largely. The solubility of hydrogen-containing silicone oil (SiH) supported phosphine compound decreases with increasing of pendant of the side chain. The structure of side chain also affects the solubility of the phosphine ligand. Furthermore, the interactions between solutes and CO2 have been tentatively explored by using FTIR spectroscopy analysis. The relationship between solubility and structures of the above compounds has been discussed.A new acrylate (2) with biphenyl diphenol group, which may be of LC property, was synthesized. UV curable gel was prepared by mixture the monomer (2)with HEMA, then cured by UV to form a film. The properties of the film were investigated. As the monomer(2) content increasing, the pencil rigidity, solvent resistance, heat resistance and water resistance of film increases, while, the impact strength and the flexility decreases. All properties of the film increase when PUA was added to the gel. When the exposure time was prolonged or combined with additional heating, all properties of the film increase. Furthermore, the kinetics of UV curing was investigated by DPC technology. The UV-curing rate increases with the temperature, but decline with the monome(r2) content . The UV-curing rate increases with degree of curing,α, at first, and then decreases. When monomer (2) content increase, the apparent active energy Ea became less dependent on degree of curing.