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