Polyketone (PK)/polycarbonate (PC) blends compatibilized with polyamide 6 (PA6) and various ratios of maleic anhydride-functionalized poly[styrene-b-(ethylene-co-butadiene)-b-styrene] (SEBS-g-MA) to unmodified poly[styrene-b-(ethylene-co-butadiene)-b-styrene] (unSEBS) were fabricated via melt mixing. The total amount of added SEBS-g-MA and unSEBS was held constant at 15 parts per hundred resin (phr). The effect of compatibilizers on morphology of PK/PC (80/20) blends was investigated with scanning electron microscope (SEM) and transmission electron microscopy (TEM). The PK/PC blends with (15/0)/15 and (7.5/7.5)/15 (SEBS-g-MA/unSEBS)/PA6 showed that size of dispersed PC particles in the PK matrix was reduced, exhibiting the compatibilizing effect. In TEM observation, it was found that incomplete encapsulation of PC particles was achieved by 7.5/7.5/15 SEBS-g-MA/unSEBS/PA6 while PC encapsulation by 15/0/15 SEBS-g-MA/unSEBS/PA6 was complete due to reactions between PA6 and SEBS-g-MA during melt mixing. The addition of SEBS-MA/unSEBS/PA6 as compatibilizer gave rise to increases in elongation at break and impact strength of PK/PC blends. Especially, drastic enhancement of the impact strength was achieved by the use of the combination of SEBS-MA, unSEBS and PA6 as compatibilizers. It is considered that incomplete PK/PC interface easily induced local shear yielding of the matrix which is responsible for dissipation of impact energy.

Effect of compatibilizers on morphology and mechanical properties of polyketone/polycarbonate blends

252nd National Meeting (2016)

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