Extrusion & Post
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EVOH blend delamination with incompatible resin
Fenómeno del problema
EVOH blended with polar resins such as PA/ABS, extrudate completely delaminated with extremely poor mechanics
Análisis de la causa
Large polarity difference between EVOH and polar resins, zero compatibility, extremely low interfacial adhesion, no compatibilizer used
Solución
1) Use EVOH grafted compatibilizer EVOH-g-MAH 2-5wt%; 2) Add epoxy-type compatibilizer 1-2wt%; 3) EVOH addition <10wt% to keep the other resin as the continuous phase; 4) Twin-screw high-shear blending to disperse EVOH <0.3μm
Conclusión clave
Blends with large polarity differences require reactive compatibilizers forming chemical bonds at the interface to solve
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