Extrusion & Post
11 görüntüleme
Delamination of PVA blended with incompatible resin
Sorun Belirtisi
PVA blended with polar resins such as PA/ABS, extrudate completely delaminated, mechanical properties extremely poor
Neden Analizi
PVA and polar resin have large polarity difference, compatibility zero, interfacial adhesion extremely low, no compatibilizer used
Çözüm
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
Temel Çıkarım
Blends with large polarity difference need reactive compatibilizer to form chemical bonding at the interface to solve
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