| The dispersed phase in a multi-component polymer blend dispersed in the matrix as sphere,ellipsoid,cylinder,column or micro-fiber-like form under different processing conditions and its sizes can vary in a wide range.It was prone to show fibril-like dispersed phase when capillarily extruded.So it was available to obtain nanoscale fibrous dispersed phase if suitable polymer system was selected,and,furthermore, nanoscale polymer fiber if the matrix can be removed by suitable solvent.In such a traditional melt spinning process,the phase separation behavior of a multi-component polymer system can be applied to prepare micro-/nano-fiber.The immiscibility,rheology and extrusion conditions were the main factors to control morphology of the dispersed phase.In this paper,thermoplastic polymers such as olefin copolymer and elastomer were used to prepare CAB/TPs blends.The morphology and Rheology of blends were studied using dynamic rheometer and SEM.It is investigated that micro-/nano-flber can be obtained easily from CAB/Olefin Copolymers blends while difficultly CAB/Elastomers.And the content of dispersed phase cannot be too highIt is found that,although micro-/nano- fibers can be obtained when viscosity ratioη_d/η_m is blow 1,the formation of the fibers were absolutely easier when the ratio is above 1.Different screw speed and winding speed also had a greater influence on the formation of micro-/nano-fibers.This study laid foundation for the future in-depth research on the functionalization of micro-/nano- fibers.Different screw speed and winding speed also had a greater influence on the formation of micro-/nano-fibers.This study laid foundation for the future in-depth research on the functionalization of micro-/nano- fibers. |
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