Study on 3D phase structure in low density polyethylene/ethylene-vinyl alcohol copolymer(PE-LD/EVOH)blends through confocal Raman imaging
The phase structure of polymer blends directly affects the macroscopic properties of the materials;therefore,it is important to investigate the size and spatial distribution of each phase.In this work,the confocal Raman imaging tech-nique was adopted to study the distribution of phases of PE-LD/EVOH blends in the horizontal and depth directions and 3D space in the compression-molded specimens.The phase structure of PE-LD/EVOH blends in 3D space was obtained at the first time,and the phase region visually corresponded to the chemical composition of the blends.The results indi-cated that the PE-LD/EVOH blends were immiscible system.20 wt%EVOH could be dispersed in the PE-LD matrix in a regular cylindrical form with a diameter of the cylinder in the range of 3～6 μm.The introduction of polyethylene grafted with maleic anhydride(PE-g-MAH)made the phase structure change significantly from the regular to irregular shape,and the cross-section size was reduced to 2 μm.This indicates that PE-g-MAH can enhance the compatibility be-tween PE-LD and EVOH significantly.
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