Abstract
The high sensitivity of crystallization to shear flow is a subject of great research interest the last several years. A set of syndiotactic polypropylene/clay composite samples were used to examine the effect of shear flow on crystallization kinetics. This phenomenon alters both processing and material final properties. In the present work, the effects of clay contents and shear flow on the rate of flow induced crystallization were investigated using rheological technique. Small amplitude oscillatory shear experiments were performed using advanced rheometric expansion system (ARES). The crystallization rate is found to alter by both shear and clay contents in the polymer composites.
Highlights
The enhancement in the rate of polymer crystallization due to the application of flow is known as flow induced crystallization
In other words flow induced crystallization can be defined as the process in which the rate of polymer crystallization is accelerated by the action of flow [1]
In the present work we studied the effect of clay loading and shear flow on the rate of crystallization of sPP/clay composites using rheological technique
Summary
The enhancement in the rate of polymer crystallization due to the application of flow is known as flow induced crystallization. The presence of a long tail of molecular weight chains should enhance the flow induced nucleation rate. Authors in [11] conducted rheological flow induced crystallization experiments on the isotactic polypropylene samples of different molecular weight and molecular weight distribution. They found an increase in the rate of crystallization by increasing the molecular weight of the samples at constant shear rate. The crystallization of long chain branched polypropylene was found more sensitive to shear flow than that of linear polypropylene during the induced period at low shear rates, which depicts that the longer relaxation time of the polymer chains played an important role in the nucleation of polypropylene under shear flow fields.
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