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