Extrusion & Post
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DSTDP blended with incompatible resins delamination
Problem Phenomenon
DSTDP blended with polar resins such as PA/ABS, extrudate completely delaminates, mechanical properties extremely poor
Cause Analysis
DSTDP and polar resins have large polarity difference, compatibility is zero, interfacial adhesion extremely low, no compatibilizer used
Solution
1) Use DSTDP graft compatibilizer DSTDP-g-MAH 2-5wt%; 2) add epoxy-type compatibilizer 1-2wt%; 3) keep DSTDP addition <10wt% to keep the other resin as the continuous phase; 4) twin-screw high-shear compounding to disperse DSTDP <0.3μm
Key Takeaway
Blends with large polarity differences require reactive compatibilizers that form chemical bonding at the interface to solve
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