Effect of Rheological Properties of Compounds on Fiber Formation in Mixtures of Incompatible Polymers

Abstract

Mixturesoflinearpolyethylene with polystyrene were used in studying the fiber formation pattern of mixtures of incompatible polymers whose melts were forced through dies. Variables included the viscosity of the components, mixture preparation conditions, and shear stress. It has been established that the process of fiber formation occurs within a definite range of shear stresses, dependent on the viscosity ratio of the fiber-forming polymer and the polymer serving as the dispersion medium. When this ratio is equal to or less than unity, mixtures containing the fiberforming component in the form of a finely dispersed phase yields continuous fibers several micrometers in diameter within a broad range of shear stresses. At greater values of the component viscosity ratio (tens of units), no fiber formation takes place in the mixtures.

Controlling micro‐ and nanofibrillar morphology of polymer blends in low‐speed melt spinning process. Part II: Influences of extrusion rate on morphological changes of a PLA/PVA blend through a capillary die

“…The formation of micro‐ and nanofibrillar phase morphology of polymer blends was one of the most challenging tasks in polymer research during the last decades. Numerous studies on morphology development of polymer blends in twin‐screw extruders as well as in spinneret channels, and the effects of various processing parameters on it have been published . By contrast, few studies have tried to investigate the morphological variations of polymeric blend systems after extrusion from the spinneret orifices into fibers .…”

Insight into the ionic liquid tetraphenylphosphine salt on the processability improvement for PEEK

“…The changes in the rheological properties of multicomponent polymers are usually caused by the characteristics of the components themselves and the interaction between the components, which can be observed via the motion state of the polymer chain under amplitude oscillation shear (SAOS) using a rotational rheometer. [23][24][25] To investigate the effect of IL on the rheological properties of PEEK, the dynamic rheological behaviors including dynamic storage modulus (G 0 ), loss modulus (G 00 ), and complex viscosity, were studied with respect to the angular frequency of neat PEEK and PEEK/IL blends under SAOS, as shown in Figure 3. From Figure 3A,B, it can be observed that the G' and G" of all PEEK/IL blends increase with an increase in the angular frequency from 0.1 to 100 rad/s, which is due to the shortened relaxation time of the molecular chain at high frequency.…”