In this work, preparation and characterization of HDPE/PA6 foam blends is presented. Using a chemical blowing agent based on azodicarbonamide, foams were produced via extrusion using different concentrations of the dispersed phase PA6. Due to very different thermal and rheological properties of the polymers, good cellular structures could only be obtained by a careful selection of the temperature profile and feeding strategy of the materials. Furthermore, the use of a coupling agent was also found necessary to stabilize the blend before foaming. The final foam morphology was controlled by post-extrusion conditions and the results are discussed in terms of deformation and dimensions of foam cells and dispersed phase particles. The tensile and impact properties of the resulting foams are also reported.
Hu GH, Lamba M., Laurienzo P., Malinconico M. and Pota F.Polyethylene/polyamide 6 compatibilized blends for packaging applications: preparation, characterization and testing. J. Polym. Mater . 1998; 15: 8189.
9.
Yeh JT and Jyan CFEffects of polyethylenes on the morphology, barrier, and impact properties of polyethylene modified polyamide blends. Polym. Eng. Sci.1998; 38: 14821490.
10.
Yeh JT and Jyan CFInfluence of compatibilization and viscosity ratio on the barrier and impact properties of blends of a modified polyamide-6 and polyethylene . Polym. Eng. Sci.1999; 39: 19521961.
11.
Palabiyik M. and Bahadur S.Mechanical and tribological properties of polyamide 6 and high density polyethylene polyblends with and without compatibilizer . Wear2000; 246: 149158.
12.
Gonzalez-Núñez R., Arellano M., Moscoso FJ, Gonzalez-Romero VM and Favis BDDetermination of a limiting dispersed phase concentration for coalescence in PA6/ HDPE blends under extensional flow. Polymer2001; 42: 54855489.
13.
Gonzalez-Núñez R., Padilla H., De Kee D. and Favis BDBarrier properties of polyamide-6/high density polyethylene blends. Polym. Bull . 2001; 46: 323330.
14.
Sato H., Sasao S., Matsukawa K., Kita Y., Yamaguchi H., Siesler HW, et al. Molecular structure, crystallinity, and morphology of uncompatibilized and compatibilized blends of polyethylene/Nylon 12. Macromol. Chem. Phys.2003; 204: 13511358.
15.
Araujo JR, Vallim MR, Spinace MAS and De Paoli MAUse of postconsumer polyethylene in blends with polyamide 6: effects of the extrusion method and the compatibilizer. J. Appl. Polym. Sci.2008; 110: 13101317.
16.
Li J., Yu X. and Guo S.Development of morphology and properties of injection-molded bars of HDPE/PA6 blends along flow direction. J. Polym. Sci. Part B Polym. Phys.2007; 45: 184195.
17.
Vyas H., Shrinet V., Murthy CN, Jain RC and Singh AKPreparation and characterization of HDPE-Nylon 6 blends compatibilized with ionomer for industrial application. Polym-Plast. Tech. Eng.2008; 47: 12311241.
18.
Chou RTA novel ionomer for nylon modification. Proc. of SPE ANTEC2000; 46: 36263630.
19.
Huang HX and Liao CMHDPE/PA6 blends: parison formation behavior in extrusion blow molding. Polym . Test2003; 22: 509513.
20.
Zepeda Sahagún C., González-Núñez R. and Rodrigue D.Morphology of extruded PP/ HDPE foam blends. J. Cell. Plast.2006; 42: 469485.
21.
Zhai W., Wang H., Yu J., Dong J. and He J.Foaming behavior of polypropylene/polystyrene blends enhanced by improved interfacial compatibility. J. Polym. Sci. Part B Polym. Phys.2008; 46: 16411651.
22.
Reyes-Lozano C.Morfología y propiedades de mezclas espumadas de PEAD/PA6. M.Sc. Thesis, Universidad de Guadalajara , Mexico, 2006.
23.
Gosselin R. and Rodrigue D.Cell morphology analysis of high density polymer foams. Polym. Test2005; 24: 10271035.
24.
Zepeda Sahagun C., Gonzalez-Nuñez R. and Rodrigue D.Effects of postextrusion conditions on the morphology of foamed high-density polyethylene/polypropylene blends. J. Appl. Polym. Sci.2007; 106: 12151227.
25.
Flaconnèche B., Martin J. and Klopffer MHPermeability, diffusion and solubility of gases in polyethylene, polyamide 11 and poly(vinylidene fluoride). Oil & Gas Sci. Tech-Rev. IFP2001; 56: 261278.
26.
Folkes MJ and Hope PSPolymer blends and alloys. London: Blackie Academic & Professional, 1993.
27.
Chapleau N. and Favis BDDroplet fiber transition in immiscible polymer blends generated during melt processing. J. Mater. Sci.1995; 30: 142150.
28.
Padilla Lopéz H., Vázquez MO, González Núñez R. and Rodrigue D.Influence of postextrusion parameters on the final morphology of polystyrene/high density polyethylene blends. Polym. Eng. Sci.2003; 43: 16461656.
29.
Ramírez-Arreola D., Padilla López H., González-Núñez R. and Rodrigue D.The effect of post-extrusion conditions in ribbon extrusion of polymer blends . Int. Polym. Proc.2006; 21: 121131.
30.
Doroudiani S. , Park CB and Kortschot MTProcessing and characterization of microcellular foamed high-density polyethylene/isotactic polypropylene blends. Polym. Eng. Sci.1998 ; 38: 12051215.
31.
Herrera Tejeda E., Zepeda Sahagún C., González-Núñez R. and Rodrigue D.Morphology and mechanical properties of foamed polyethylene-polypropylene blends. J. Cell. Plast. 2005; 41: 417435.
