Abstract
The vane plasticating extruder (VPE) is a novel polymer processing equipment which is based upon elongational rheology. According to the basic structural analysis and movement interpretation, generation mechanism of elongational flow field was derived. Elongational effects during the controlled recovery of immiscible polymer blends, containing polystyrene (PS) matrix and linear low density polyethylene (LLDPE) as dispersed phase, were studied. The morphological results revealed the elongational effect of vane extruder. LLDPE morphology evolution was precisely predicted by a mathematical model. Elongational ratio and elongational strain via VPE were calculated separately, both of which established that the VPE does imposed elongational force field on polymer blends. DOI: http://dx.doi.org/10.5755/j01.mech.23.6.19855
Highlights
vane plasticating extruder (VPE) - fibrils volume of linear low density polyethylene (LLDPE) in PS matrix through the recovery procedure; S i t single cross section area of LLDPE fibril during recovery process; lti - single length of LLDPE fibril during recovery process; St - average cross section area of LLDPE fibrils in recovery mode; lt - length of LLDPE fibril in recovery mode; n number of LLDPE fibrils in recovery mode; - elongational ratio in recovery mode; l0 - average length of time when St equals St* in recovery mode; - average length of LLDPE fibrils in processing in VPE; elongational strain rate in processing in VPE.Over the past two decades, the production and application of polymer blends have increased enormously
These LLDPE fibrils were completely exposed in the vertical section, while others were inserted or partly inserted in the PS matrix
It was found that the elongational flow field did exist during the circumferential vane plasticating and conveying units (VPCUs) revolving in each inter cavity
Summary
VPE - fibrils volume of LLDPE in PS matrix through the recovery procedure; S i t. With regards to the devices used for melt blending, researchers have always used screw extruders to process polymer materials. In order to optimize the design of VPE, the processing mechanism needed to be demonstrated, and the elongational effect should be quantified. In order to investigate the mechanism of generation of elongational flow field by VPE, the inner structures of VPE and the morphologies of polymer melts were analysed using mathematical modelling. The im miscible linear low density polyethylene (LLDPE)/ polystyrene (PS) blends were extruded using the VPE, and after deformation in VPE, the evolution of phase structure was studied during the recovery mode. According to the modelling and verification, the rate of elongational deformation of LLDPE was calculated, which was used to quantify the effect of VPE
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