Study On The Polymerization Behavior Of Organosilicon-acrylate Latex With Core-shell Structure Using Fluorescence Probe Technique

The organosilicon-acrylate latex with core-shell structure has been widely studied due to its excellent performance. The values of pyreneâ… ₁/â… ₃ can be used as a ruler for determine the polar of microenvironment. The information of hydrophobic associating structure can be attained by analysis pyrene in water and in hydrophobic associating structure. The values ofâ… ₁/â… ₃ for probe pyrene changed when the morphology of latex particle changed during the emulsion polymerization process. In this paper, the polymerization behavior of the organosilicon-acrylate latex with core-shell structure was studied by fluorescence probe technique firstly. The reaction mechanism of organosilicon-acrylate latex was also discussed. The results showed that fluorescence probe technique can be used to monitor the progress of the polymerization behavior of latex. In this paper, there are four aspects were studied.â‘ The critical micelle concentration(CMC) of sodium dodecyl sulfate(SDS), sodium dodecylbenzene sulfonate ( SDBS ) , alklphenol ethoxylates(OP-10) and composite emulsifiers were determined using fluorescence probe technique. It has the same results as others obtained by other classical methods. And the effect of emulsifier types on CMC was discussed.â‘¡The polymerization behavior and reaction mechanism of organosilicon-acrylate latex were studied, in which pyrene was used as fluorescence probe. It showed that the essential effects of morphology and number of the latex particles include monomer of siloxane,emulsifier concentration,initiator. The values of pyreneâ… ₁/â… ₃ changed when the morphology of latex particles changed. Polyacrylate was not just covered on the seeded latex particles but interpenetrated each other from network. That means the reaction mechanism of organosilion-acrylate latex was interpenetrating polymer network (IPN).â‘¢The mechanism of the organosilicon-acrylate latex was discussed by X-ray photoelectron spectroscopy(XPS) further. It showed that migration of the internal PS domains in-between the polyacrylic, so the mechanism of the organosilicon-acrylate latex with core-shell structure was interpenetrating polymer network (IPN). This result was also the same as the result obtained by fluorescence probe technique.â‘£The latex was characterized by the particle size analysis, coating performance testing , results showed that when the amonunt of emulsifier(mSDS:mOP-10=1:1)was 2g; the amount of core monomer was 8g; the amonunt of initiator (KPS) was 0.7% , a good performance emulsion can be obtained. This result was also the same as that obtained by fluorescence probe technique. Therefore, fluorescence probe technique can be used to monitor the progress of the polymerization behavior of organosilion-acrylate latex with core-shell structure.