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Grafting of polyethylenes by reactive extrusion. II. Influence on rheological and thermal properties

1999; Wiley; Volume: 73; Issue: 13 Linguagem: Inglês

10.1002/(sici)1097-4628(19990923)73

1097-4628

C. Rosales, R. Perera, Jorge Luis González-Velázquez, Miren Ichazo, Héctor Rojas, A. S�nchez,

Polymer Science and PVC

Journal of Applied Polymer ScienceVolume 73, Issue 13 p. 2549-2567 Grafting of polyethylenes by reactive extrusion. II. Influence on rheological and thermal properties C. Rosales, Corresponding Author C. Rosales Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaUniversidad Simón Bolívar, Departamento de Mecánica, Caracas, Venezuela===Search for more papers by this authorR. Perera, R. Perera Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this authorJ. Gonzalez, J. Gonzalez Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this authorM. Ichazo, M. Ichazo Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this authorH. Rojas, H. Rojas Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this authorA. Sánchez, A. Sánchez Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this author C. Rosales, Corresponding Author C. Rosales Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaUniversidad Simón Bolívar, Departamento de Mecánica, Caracas, Venezuela===Search for more papers by this authorR. Perera, R. Perera Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this authorJ. Gonzalez, J. Gonzalez Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this authorM. Ichazo, M. Ichazo Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this authorH. Rojas, H. Rojas Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this authorA. Sánchez, A. Sánchez Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaSearch for more papers by this author First published: 08 July 1999 https://doi.org/10.1002/(SICI)1097-4628(19990923)73:13 3.0.CO;2-NCitations: 15Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract In this article, the effects of the grafting degree and the processing conditions employed to prepare LLDPEs-g-DEM and HDPEs-g-DEM via reactive extrusion on their rheological and thermal properties were studied. The rheological properties of the virgin samples of LLDPEs, HDPEs, and their functionalized products were determined using capillary and dynamic rheometry. The thermal behavior of the virgin materials and their grafted products was examined by differential scanning calorimetry (DSC). It was found that the rheological properties are more sensitive than are the molecular structure characteristics to the changes produced by the grafting reactions with DEM, under the employed experimental conditions. There is an increase in the dynamic viscosity at low frequencies, in the storage modulus, and in the shear-thinning behavior when the grafting degree increases. The crossover between G″ and G′ moves to lower frequencies and the relaxation time spectrum functions are broader in the grafted materials. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2549–2567, 1999 REFERENCES 1 Utracki, L. A.; Schlund, B. 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