Extrusion & Post
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EVOH blend delamination with incompatible resin
Problem Phenomenon
EVOH blended with polar resins such as PA/ABS, extrudate completely delaminated with extremely poor mechanics
Cause Analysis
Large polarity difference between EVOH and polar resins, zero compatibility, extremely low interfacial adhesion, no compatibilizer used
Solution
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
Key Takeaway
Blends with large polarity differences require reactive compatibilizers forming chemical bonds at the interface to solve
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