Effect of the molar mass change of a matrix polymer (Nylon 6) on the deformation of dispersed phase (a thermotropic liquid crystalline polymer) droplets in shear flow
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Tailoring the polymer melt rheology permits easy handling of polymer processing and enables broader range of applications. Novel strategy to control the polymer melt rheology dynamics was devised to easily change the molecular structure of a polyamide 6 in a controllable manner without forming a network structure. The zero shear viscosity of the polyamide has increased more than 200 folds of linear chains viscosity, whereas the molar mass change was ca. 1.6 times. Storage modulus and the loss modulus at low frequency increased more than 104 and 103 times to those of neat polyamide without forming a network structure. We also investigated the effect of a change in the molecular structure and ensuing molar mass change of a matrix polymer (polyamide 6, Ny 6) on droplet deformation of a dispersed thermotropic liquid crystalline polymer (TLCP, a poly(ester amide)) in shear flow. The total capillary number, including the elastic capillary number, was sufficiently greater than the critical capillary number for deformation of the dispersed TLCP droplets.