Polymerized mlcroemulslon systems

The Interaction between polymers and the colloidal droplets In mlcroemulslons results In space conflicts due to the entroplc conformational demands by the polymer. This Is a serious problem as Is evident by a multitude of systems which has shown phase separation during polymerization. However this Interaction Is not the only one of Importance for the polymer/mlcroemulslon system. An aromatic dimer has been shown to also have a strong Influence on the mlcroemulslon region even though Its conformation variation does not exist. 

Somewhat surprisingly. Increasing the concentration of AIBN did not decrease the polymer molecular weight, as Is observed In conventional emulsion polymerizations (see Figure 9). This type of behavior has been observed In mlcroemulslon polymerizations (M) f and has been attributed to the difficulty of the initiator to penetrate the Interface because of the larger amount of surfactant In mlcroemulslon systems than In conventional emulsion polymerizations. 

It Is easy to realize that polymerization In the system will severely Influence these factors causing destabilization (13) because of conflict between the need for conformational freedom of the polymer and the space required for mlcroemulslon droplets. 

Although detailed and extensive, these works have not presented a definitive mechanism for particle nucleatlon and growth in styrene mlcroemulslon polymerization. This paper describes a kinetic investigation of this system using water-soluble and oil-soluble initiators and a comparison of mlcroemulslon polymerization with conventional emulsion polymerization and mlnlemulslon polymerization, to determine the nucleatlon and particle growth mechanism. 

Effect of Continuous-Phase Composition. In order to determine the temperature range in which acrylamide mlcroemulslon polymerization could be conducted within a supercritical alkane continuous phase, the phase behavior of the Brlj mixture/water/acrylamide system in mixtures of propane (T - 97 C) and ethane (T, 32 C) was Investigated. In addition, extqploylng a mixture of ethane and propane allows us to examine the effect of the continuous-phase... 

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