Extrusion & Post
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Delamination in Blending CMC with Incompatible Resins
Problem Phenomenon
When CMC is blended with polar resins such as PA/ABS, the extrudate completely delaminates and the mechanical properties are extremely poor
Cause Analysis
The polarity difference between CMC and polar resins is large, compatibility is zero, interfacial adhesion is extremely low, and no compatibilizer is used
Solution
1)Use CMC grafted compatibilizer CMC-g-MAH 2-5wt%; 2)Add epoxy compatibilizer 1-2wt%; 3)CMC addition <10wt% to keep the other resin as the continuous phase; 4)Twin-screw high-shear blending to disperse CMC to <0.3μm
Key Takeaway
Blends with large polarity differences require reactive compatibilizers to form chemical bonding at the interface to solve the problem
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