Effect of Draw Ratio on the Preparation of High Density Polyethylene Microporous Membrane by Stretching
Paper ID : 1179-MST2015-FULL
Jalil Morshedian1, Hossein-Ali Khonakdar2, Udo Wagenknecht3, Hoda Bayazian1
1Iran Polymer and Petrochemical Institute
2Iran Polymer and Petrochemical Institute; Leibniz Institute of Polymer Research Dresden
3Leibniz Institute of Polymer Research Dresden
Membrane formation by stretching oriented cast films is regarded as a very clean and economical process, since this process does not require any solvents, diluents or additives. In this study, cast films based on high density polyethylene (HDPE) were prepared by melt extrusion at different draw ratios. These precursor films were used to produce microporous membranes. The membranes were prepared by annealing at elevated temperatures followed by cold and hot stretching, respectively. Morphology, crystallinity and crystal orientation of the precursor films and also the produced membranes were evaluated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) analyses, respectively. The crystal orientation of the precursor films and also uniformities of micropore structure of corresponding microporous membranes were improved as the applied draw ratio increased for the precursor films. It was found that the main factor controlling the properties of stretched microporous membrane is the applied draw ratio.
HDPE; microporous membrane; stretching; crystal orientation
Status : Paper Accepted (Poster Presentation)