Extrusion & Post
12 مشاهدة
Delamination of PVA blended with incompatible resin
ظاهرة المشكلة
PVA blended with polar resins such as PA/ABS, extrudate completely delaminated, mechanical properties extremely poor
تحليل الأسباب
PVA and polar resin have large polarity difference, compatibility zero, interfacial adhesion extremely low, no compatibilizer used
الحل
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
الخلاصة الأساسية
Blends with large polarity difference need reactive compatibilizer to form chemical bonding at the interface to solve
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