Acrylonitrile-co-butadiene-co-styrene (ABS) terpolymer/poly (ethylene terephthalate) (PET) blends were modified using the styrene-acrylonitrile-glycidyl methacrylate (SAG) and styrene-acrylonitrile-maleic anhydride (SMA) terpolymer as compatibilizers.
Then, the mechanical properties in terms of the tensile strength, flexural strength and modulus, notched impact strength, melting flow rate (MFR) and morphology were studied in order to verify the compatibility effect between SAG and SMA.
The Formula of the specimens
Result 1: No big differences between SAG and SMA modified ABS/PET blends were observed in the tensile strength, flexural strength and modulus.
Figure 1-2. The effect of SAG and SMA on the tensile and bending property of ABS/PET alloy.
Result 2: The impact strength of SAG modified ABS/PET alloy was much higher (181 J/m) than that of SMA (119 J/m) modified system. In addition, the MFI of the SAG modified ABS/PET system was lower than that of the SMA modified one.
Figure 3-4. The impact strength and melt flow index upon different compatilizers of ABS/PET alloy.
Result 3: According to the SEM images of ABS/PET alloy, the SAG modified ABS/PET alloy showed better dispersion with smaller size of PET domain in the ABS matrix. This implies that the interfacial force improved upon the addition of SAG, resulting in higher impact strength and lowering the MFI.
Figure 5. The SEM morphology of ABS/PET，PET domain in the ABS matrix. (a) is 5.00k magnification for #3 without compatibilizer, and (b) is 5.00k magnification for #1 with SAG-002.
Conclusion
The only difference between SAG and SMA was the functional groups; epoxy groups in SAG and anhydride group in MAH. As a result, it was suggested that the compatibility effect of SAG would be much higher than that of SMA and this is due to the higher reactivity between SAG and ABS/PET than that between SMA and ABS/PET.
Previous: Compatibilizer of ABS/PET—two kinds of functional groups Next: 中国反应挤出“第一人”— 郑安呐教授谈挤出反应