Rheology, Processing, Tensile Properties, and Crystallization of Polyethylene/Carbon Nanotube Nanocomposites
| Autor: | Ph. Dubois, Mariselis Trujillo, Stéphane Bredeau, Javier Martínez-Salazar, María Luisa Arnal, Juan Francisco Vega, Alejandro J. Müller |
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| Rok vydání: | 2009 |
| Předmět: |
Nanocomposite
Materials science Polymers and Plastics Rheometry Organic Chemistry Polyethylene law.invention Inorganic Chemistry Shear modulus Viscosity chemistry.chemical_compound chemistry law Masterbatch Polymer chemistry Materials Chemistry High-density polyethylene Crystallization Composite material |
| Zdroj: | Macromolecules. 42:4719-4727 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma900645f |
| Popis: | A nanocomposite sample was prepared by melt mixing a high density polyethylene (HDPE) with an in situ polymerized HDPE/multi wall carbon nanotube (MWNT) masterbatch. The nanocomposite had an approximate content of 0.52 wt % MWNT. Rheological, thermal, and mechanical properties were investigated for both neat HDPE and nanocomposite. The nanocomposite, when compared to the neat polymer, exhibits lower values of viscosity, shear modulus and shear stress in extrusion and a concurrent delay of the distortion regimes to higher shear stresses and rates. The nanocomposite presents also improved dimensional stability after processing, and lower values of the melt strength, draw ratio and viscosity in elongational flow. This behavior has been observed in composites in which an adsorption of a fraction (that with the highest molecular weight or relaxation time) of the polymer chains is considered. Furthermore, the enhancement in the crystallization kinetics, probed by rheometry and DSC, suggests that the carbon nano... |
| Databáze: | OpenAIRE |
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