Correlation of Morphology Evolution with Superior Mechanical Properties in PA6/PS/PP/SEBS Blends Compatibilized by Multi-phase Compatibilizers
- 23 Downloads
In this study, the maleic anhydride (MAH) and styrene (St) dual monomers grafted polypropylene (PP) and poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS), i.e. PP-g-(MAH-co-St) and SEBS-g-(MAH-co-St) are prepared as multi-phase compatibilizers and used to compatibilize the PA6/PS/PP/SEBS (70/10/10/10) model quaternary blends. Both PS and SEBS are encapsulated by the hard shell of PP-g-(MAH-co-St) in the dispersed domains (about 2 μm) of the PA6/PS/PP-g-(MAH-co-St)/SEBS (70/10/10/10) quaternary blend. In contrast, inside the dispersed domains (about 1 μm) of the PA6/PS/PP/SEBS-g-(MAH-co-St) (70/10/10/10) quaternary blend, the soft SEBS-g-(MAH-co-St) encapsulates both the hard PS and PP phases and separates them. With increasing the content of the compatibilizers equally, the morphology of the PA6/PS/(PP+PP-g-(MAH-co-St))/(SEBS+SEBS-g-(MAH-co-St)) (70/10/10/10) quaternary blends evolves from the soft (SEBS+SEBS-g-(MAH-co-St)) encapsulating PS and partially encapsulating PP (about 1 μm), then to PS exclusively encapsulated by the soft SEBS-g-(MAH-co-St) and then separated by PP-g-(MAH-co-St) inside the smaller domains (about 0.6 μm). This morphology evolution has been well predicted by spreading coefficients and explained by the reaction between the matrix PA6 and the compatibilizers. The quaternary blends compatibilized by more compatibilizers exhibit stronger hierarchical interfacial adhesions and smaller dispersed domain, which results in the further improved mechanical properties. Compared to the uncompatibilized blend, the blend with both 10 wt% PP-g-(MAH-co-St) and 10 wt% SEBS-g-(MAH-co-St) has the best mechanical properties with the stress at break, strain at break and impact failure energy improved significantly by 97%, 71% and 261%, respectively. There is a strong correlation between the structure and property in the blends.
KeywordsCompatibilization Morphology evolution Superior mechanical properties
Unable to display preview. Download preview PDF.
This work was financially supported by the National Natural Science Foundation of China (No. 51633003) and State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology (No. OIC-201601006).
- 2.Paul, D. R.; Bucknall, C. B. "Polymer blends", Wiley, New York, 2000.Google Scholar
- 6.Robeson, L. M. "Polymer blends: a comprehensive review", Carl Hanser Verlag, 2007.Google Scholar
- 10.Xu, Y.; Thurber, C. M.; Macosko, C. W.; Lodge, T. P.; Hillmyer, M. A. Poly(methyl methacrylate)-blockpolyethylene- block-poly(methyl methacrylate) triblock copolymers as compatibilizers for polyethylene/poly(methyl methacrylate) blends. Ind. Eng. Chem. Res. 2014, 53(12), 4718–4725.CrossRefGoogle Scholar
- 24.Chanda, M.; Roy, S. K. "Plastics fabrication and recycling", Taylor and Francis, 2009.Google Scholar
- 41.Li, Y.; Xie, X. M. Studies on mechanism of free radical meltgrafting of multi-monomer system for maleic anhydride/styrene onto polypropylene. Chem. J. Chinese U. 2000, 21(4), 637–642.Google Scholar
- 44.Xie, X.; Li, Y.; Zhang, J.; Yang, X. Study of melt free radical grafting of maleic anhydride and styrene onto polypropylene and its properties. Acta Polymerica Sinica (in Chinese) 2002, (1), 7–12.Google Scholar
- 46.Wu, S. “Polymer interface and adhesion”, Marcel Dekker, New York, 1982.Google Scholar