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Effect of functionalized polyethylenes on clay dispersion in high density polyethylene nanocomposites

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Abstract

The compatibilization effects provided by maleic anhydride (MA), itaconic acid (IAc), itaconic anhydride (IA), and 2-[2-(dimethylamine)-ethoxy]ethanol (DMAE) functionalized polyethylenes for forming high density polyethylene (HDPE)-based nanocomposites were studied and compared. IAc and IA were grafted into HDPE by melt mixing to obtain functionalized polyethylenes (HDPEgIAc and HDPEgIA) and amino alcohol functionalized polyethylene was prepared by reaction of commercial HDPEgMA with DMAE in the melt to form polyethylene-grafted dimethyl-amine-ethoxy-ethanol (PEgDMAE). Nanocomposites were prepared by melt processing using a twin screw extruder by blending polyethylene and these compatibilizers with a quaternary ammonium surfactant-modified montmorillonite clay (Nanomer I28E). FTIR characterization confirmed the formation of these compatibilizers and confirmed the reaction between HDPEgMA and the amino alcohol. All the compatibilized nanocomposites had better clay exfoliation compared to the uncompatibilized HDPE nanocomposites. Barrier properties, X-ray diffraction and transmission electron microscopy results showed the following order of their performance as a compatibilizer: PEgDMAE > HDPEgAI > HDPEgAcI > HDPEgMA. This behavior was attributed to the specific interactions between the anionic surface of the clay and the functionality of the compatibilizer. Samples with higher clay content showed poorer clay dispersion or intercalation which was attributed to possible clay saturation when the van der Waals attractive interactions between the clay layers become dominant when the distance between them was small enough at a certain concentration of clay. A noticeable reduction in the degree of crystallinity with the incorporation of nanoclay was observed by thermal analysis whereas the melting temperature did not change noticeably.

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Acknowledgments

The authors gratefully acknowledge the financial support of CONACyT through project: CB-104865. The authors would like to thank Aracely-Nospanco, Alejandro-Espinoza, Jesus-Rodriguez, Fabian-Chavez, Francisco-Zendejo, Jose Lopez-Rivera, Patricia-Siller, and Miriam-Lozano for their technical support.

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Authors and Affiliations

  1. Centro de Investigación en Química Aplicada, Blvd Enrique Reyna 140, 25294, Saltillo, COAH, Mexico

    S. Sanchez-Valdes, E. Ramírez-Vargas, L. F. Ramos de Valle, J. Méndez-Nonell, J. G. Martinez-Colunga, M. H. Gutierrez-Villarreal, M. L. Lopez-Quintanilla, M. Sanchez-Adame & D. Mendoza-Garcia

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  1. S. Sanchez-Valdes
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  2. E. Ramírez-Vargas
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  3. L. F. Ramos de Valle
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  4. J. Méndez-Nonell
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  5. J. G. Martinez-Colunga
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  6. M. H. Gutierrez-Villarreal
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  7. M. L. Lopez-Quintanilla
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  8. M. Sanchez-Adame
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  9. D. Mendoza-Garcia
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Correspondence to S. Sanchez-Valdes.

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Sanchez-Valdes, S., Ramírez-Vargas, E., de Valle, L.F.R. et al. Effect of functionalized polyethylenes on clay dispersion in high density polyethylene nanocomposites. Polym. Bull. 70, 535–547 (2013). https://doi.org/10.1007/s00289-012-0850-7

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  • DOI: https://doi.org/10.1007/s00289-012-0850-7

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