Studies on the Pseudo Ternary Phase Diagrams of Micro-emulsion Systems and Micro-emulsion Polymerization of H-PDMS/MMA/ n-BA

Abstract

The pseudo phase diagrams of the systems of (OP-10/SDS)/butanediol-hydrogen-contained polymethylsiloxane (H-PDMS)/methyl methacrylate (MMA)/n-butyl acrylate (n-BA)–water, with different amounts of H-PDMS, were drawn. PDMS/P (MMA-BA) nano-composite latex particles were prepared by micro-emulsion polymerization, and the initiator was dripped into the micro-emulsion. The experiment results showed that when the amount of H-PDMS was in the range of 2.5∼3.5%, the area of O/W of micro-emulsion in pseudo phase diagram was relatively large, while when the amount of H-PDMS was less than or greater than 2.5∼3.5 %, the area of O/W of micro-emulsion was relatively small. In the micro-emulsion polymerization process, the average size of latex particles was dominated by the amount of initiator and the polymerization temperature. The experiment results also indicated that the size of the PDMS/P (MMA-BA) nano-composite latex particles is in the range of 26–65 nm, with the concentration of the initiator in the range of 0.6 × 10^–2-1.46×10⁻²mol/L, at temperature 60–65°C.

Keywords:

• Phase diagram
• micro-emulsion polymerization
• hydrogen-containing polydimethylsiloxane
• acrylate
• nano-composite latex particles