Grafting of polyethylenes by reactive extrusion. I. Influence on the molecular structure
1998; Wiley; Volume: 70; Issue: 1 Linguagem: Inglês
10.1002/(sici)1097-4628(19981003)70
ISSN1097-4628
AutoresC. Rosales, R. Perera, Miren Ichazo, Jorge Luis González-Velázquez, Héctor Rojas, A. Sánchez, Antonio Díaz‐Barrios,
Tópico(s)Recycling and Waste Management Techniques
ResumoJournal of Applied Polymer ScienceVolume 70, Issue 1 p. 161-176 Grafting of polyethylenes by reactive extrusion. I. Influence on the molecular structure C. Rosales, Corresponding Author C. Rosales Universidad Simón Bolívar, Departamento de Mecánica, Caracas, VenezuelaUniversidad Simón Bolívar, Departamento de Mecánica, Caracas, Venezuela INTEVEP, Departamento de Productos, Los Teques, Edo. Miranda, Venezuela===Search for more papers by this authorR. Perera, R. Perera 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 authorJ. Gonzalez, J. Gonzalez 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 authorA. Díaz Barrios, A. Díaz Barrios INTEVEP, Departamento de Productos, Los Teques, Edo. Miranda, 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 INTEVEP, Departamento de Productos, Los Teques, Edo. Miranda, Venezuela===Search for more papers by this authorR. Perera, R. Perera 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 authorJ. Gonzalez, J. Gonzalez 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 authorA. Díaz Barrios, A. Díaz Barrios INTEVEP, Departamento de Productos, Los Teques, Edo. Miranda, VenezuelaSearch for more papers by this author First published: 07 December 1998 https://doi.org/10.1002/(SICI)1097-4628(19981003)70:1 3.0.CO;2-ACitations: 42AboutPDF 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 Abstract Grafting of polyethylenes is an important method used in the modification of polyolefins with functional groups. Lately, the use of extruders as polymerization reactors has increased considerably. However, knowledge of the details of the reaction in the extruder is still limited. In this investigation, the grafting of various commercial polyethylenes, high-density polyethylenes (HDPEs), and linear low-density polyethylenes (LLDPEs) with diethyl maleate (DEM) was carried out in two corotating twin-screw extruders with different screw configurations and extrusion conditions. Two initiators at different concentrations were used. It was found that when the initiator level was raised in the LLDPEs the grafting degree increased and the molecular weight distribution of the grafted LLDPE2 did not show appreciable differences when they were compared to the virgin resin. On the other hand, the terminal vinyl group concentrations decreased at the expense of increasing the trans unsaturation concentrations. This last result is consistent with the formation of long-chain branching. Additionally, the weight-average molecular weight of grafted high-density polyethylene (HDPE1-g-DEM) decreased. The grafting efficiencies were consistent with the attained residence times and also with the kinetics of the decomposition of the peroxides. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 161–176, 1998 Citing Literature Volume70, Issue13 October 1998Pages 161-176 RelatedInformation
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