3. Results and discussion
3.1 SEM analysis of the LDPE/EVA blended films
In Fig.1, the SEM micrographs clearly indicate that every blend at any composition has two-phase morphology which signifies immiscibility of LDPE and EVA. The micrographs in Fig.1b and 1c revealed that the EVA phase (elliptical dark hole because of xylene etching) was uniformly distributed in the LDPE matrix when the EVA content was not more than 10%wt. Number of hole increased with increasing EVA content in the blend. Therefore, the EVA particles were well dispersed within the LDPE matrix within the range of
10% wt composition. However, in Fig. 1d, as the EVA content increased to 20 %wt, they accumulated and became larger which led to discrete phase.Furthermore, elliptical and elongated shape of EVA phase appeared when EVA phase was presented because of shear stress from film-blowing conditions. Our findings correlated to the study of Na B et.al in HDPE/EVA blends which shear stress were applied due to dynamic packing injection molding.