Extrusion & Post
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Delamination of EVA blended with incompatible resins
Problem Phenomenon
EVA blended with polar resins such as PA/ABS produces completely delaminated extrudate with extremely poor mechanical properties
Cause Analysis
Large polarity difference between EVA and polar resins with zero compatibility and extremely low interfacial bonding force; no compatibilizer used
Solution
1) Use EVA grafted compatibilizer EVA-g-MAH 2-5wt%; 2) Add epoxy compatibilizer 1-2wt%; 3) EVA addition <10wt% to keep the other resin as continuous phase; 4) Twin-screw high shear blending to disperse EVA <0.3μm
Key Takeaway
Blends with large polarity difference need reactive compatibilizer to form chemical bonding at the interface
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