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