Control of Dispersed Polymer Domain Size Formation in Melt Processing, 2007 PLACE Conference

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During the formation of cavitated films the cavitating agent needs to be completely dispersed and controlled in average particle size. When producing cavitated films with mineral based cavitating agents this is done with particle size reduction and dispersive mixing. However, when using incompatible polymer blends are used, the size of the dispersed phase will impact the quality of the final film and needs to be controlled. Control of the domain size is possible be the proper selection of the individual polymers melt viscosity, the relative compatibility of the pair in combination with the processing conditions combine to control the domain size of the dispersed phase. Correlations between the dispersed domain size and the capillary number can be developed.