Extrusion & Post
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ABAK poor compatibility delamination
Problem Phenomenon
ABAK (ABS/PA alloy) products exhibit delamination and peeling, with weak bonding at the two-phase interface, mechanical properties far below expectations, and obvious phase separation visible on the fracture surface.
Cause Analysis
ABS is an amorphous weakly polar polymer, while PA is a crystalline strongly polar polymer; their solubility parameters differ greatly, making them thermodynamically incompatible; simple blending results in high interfacial tension between the two phases, and mechanical properties are very poor without a compatibilizer.
Solution
①A compatibilizer must be added (ABS-g-MAH or SMA, dosage 3~8%); ②select commercial alloy grades with pre-compatibilization; ③avoid simple self-blending; ④perform phase morphology analysis on delaminated parts to confirm compatibility.
Key Takeaway
The compatibility of ABAK is the decisive factor for alloy performance; 3~8% compatibilizer is the patent-verified optimized range; commercial grades are more reliable than self-blending.; After confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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