Extrusion & Post
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Delamination of EVA blended with incompatible resins
Fenómeno del problema
EVA blended with polar resins such as PA/ABS produces completely delaminated extrudate with extremely poor mechanical properties
Análisis de la causa
Large polarity difference between EVA and polar resins with zero compatibility and extremely low interfacial bonding force; no compatibilizer used
Solución
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
Conclusión clave
Blends with large polarity difference need reactive compatibilizer to form chemical bonding at the interface
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