科研之友
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摘要
A novel type of highly uniform polymer microspheres, poly(urea-siloxane) (PUSs) was prepared through the precipitation polymerization of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane (APTMDS) with isophorone diisocyanate (IPDI) in H2O-acetone mixed solvent. No additives such as surfactant and initiator were used. The effects of monomer ratio, H2O/acetone ratio, and monomer concentration on the yields and morphologies of the PUSs were investigated. Results indicated that PUS sizes can be regulated from 2.14 mu m to 7.11 mu m by varying the monomer ratio, monomer concentration and H2O/acetone ratio. Hydrogen bonds between polyurea units, polyurea and APTMDS moieties endowed the materials with good elasticity. The structures and morphologies of the materials were characterized by FT-IR, NMR, and SEM, and the thermal properties were characterized by TGA and DSC analyses.
