STUDY OF DISPERSION MORPHOLOGIES OF ISOTACTIC POLYPROPYLENE AND LINEAR LOW DENSITY POLYETHYLENE BLENDS BY SCANNING ELECTRON MICROSCOPY

摘要

Isotactic polypropylene (iPP) and linear low-density polyethylene (LLDPE) blends with five different component ratios were prepared by melt mixing. The blends were subsequently remelted at 200 degrees C for 1, 2, 3, 5, 8, 12, 20 min, and 2 h. The morphologies of the heat-treated and as-blended materials were studied on the cryogenically fractured surfaces of these blends by scanning electron microscopy (SEM). It was found that the morphologies of the blends with equal component ratio were highly unstable in remelting, while those blends with the lowest minor component ratios were the most stable ones, showing a growth in the size of the dispersed particles. (C) 1996 John Wiley & Sons, Inc. [References: 38]