Extrusion & Post
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EMA Delamination When Blended with Incompatible Resins
Fenómeno del problema
When EMA is blended with polar resins such as PA/ABS, the extrudate completely delaminates, mechanical properties extremely poor
Análisis de la causa
The polarity difference between EMA and polar resins is large, compatibility is zero, interfacial adhesion extremely low, no compatibilizer used
Solución
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
Conclusión clave
Blending with large polarity differences requires reactive compatibilizer to form chemical bonding at the interface to solve it
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