Preparation and characterization of polysiloxane‐acrylate latexes with MPS‐PDMS oligomer as macromonomer

The latexes of polysiloxane and acrylate with methacryloxypropyl trimethoxysilane (MPS)–polydimethylsiloxane (PDMS) oligomer as macromonomer and Gemini surfactant as coemulsifier were prepared by emulsion copolymerization and characterized by 1H-nmr, gel-permeation chromatography (GPC), FTIR, x-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). First, the oligomer of MPS-PDMS (SiOSi chain length = 24) were synthesized by the hydrolysis of MPS and the ring-opening polymerization of octamethyl tetracyclosiloxane (D4), the 1H-NMR and FTIR spectra indicated that when the reaction time was prolonged to 2 h, more than 90% of Si (OCH3)3 groups were hydrolyzed; Then, the emulsion polymerization was performed with the oligomer as macromonomer and Gemini Surfactant as coemulsifier, the result of FTIR indicated that almost all the macromonomer had been exhausted because there was no CC characteristic peaks in the spectrum. XPS investigation of the latexes showed that with the increase of siloxane content, more and more polysiloxane occupied the outer layer of the membrane, which agreed well with the conclusion of contact angle and AFM measurements. With Gemini surfactant as coemulsifier in the system, the PDMS content in the system could reach to 50%, which was far higher than the other reported value. © 2009 Wiley Periodicals, Inc. Journal of Applied Polymer Science, 2009

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