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