Polyethylene/polyamide blends morphology

M.E. Cordova, A.T. Lorenzo, A.J. Miillta-, L. Gani, S. Tence-Girault, L. Leibler, The influenee of blend morphology (co-continuous or sub-micrometer droplets dispersions) on the nucleation and crystallization kinetics of double crystalline polyethylene/polyamide blends prepared by reactive extrusion. Macromol. Chem. Phys. 212, 1335-1350 (2011)... 

Serpe G, Jarrin J, Dawans F. Morphology-processing relationships in polyethylene-polyamide blends. Polym Eng Sci 1990 30(9) 553-65. 

F. Xiang, Y. Shi, X. Li, T. Huang, C. Chen, Y. Peng, Y. Wang, Cocontinuous morphology of immiscible high density polyethylene/polyamide 6 blend induced by multiwalled carbon nanotubes network. Eur. Polymer J. 48, 350-361 (2012)... 

S.-J. liu, W.-R. Lin, K.-Y. Lin, Morphological development in water assisted injection molded polyethylene/polyamide-6 blends. Polym. Adv. Technol. 22, 2062-2068 (2011)... 

Min et al. [91] found in a study of blends of polyethylene/polyamide-6 that the interfadal tension seemed to have a greater effed than the viscosity ratio on phase morphology. They found that the lower the interfadal tension, the finer is the morphology achieved. They suggest the role oiK/rjay (or its inverse) as a correlation parameter. (Compare Eq. (6.28-6.30).)... 

Figure 6.27 Morphology development of polyethylene/polyamide-6/SEBS-g-MA reactive blends system in an intermeshing co-rotating twin-screw extruder [74].

Dencheva N, Denchev Z, Oliveira M J and Funari S S (2010) Microstructure studies of in situ composites based on polyethylene/polyamide 12 blends, Macromolecules 43 4715-4726. Polaskova M, Cermak R, Sedlacek T, Kalus J, Obadal M and Saha P (2010) Extrusion of polyethylene/poljTDropylene blends with microfibrillar-phase morphology, Polym Compos S1 1427-1433. Wang H, Guo J and He Y X (2011) Rheology and thermal properties of polypropylene/poly(phenyl-ene sulfide) microfibrillar composites, Adv Mater Res 194-196 1506-1509. 

FeUahi, S., Favis, B.D., and Fisa, B. (1996) Morphology stability in injection-moulded high-density polyethylene/polyamide-6 blends. Polymer, 37, 2615-2626. 

Dintcheva, N.T., Filippone, G., La Mantia, F.P., Aciemo, D. Photo-oxidation behaviour of polyethylene/polyamide 6 blends filled with organomodified clay improvement of the photo-resistance through morphology modification. Polym. Degrad. Stab. 95, 527-535... 

Mederic P, VUle 1, Huitric 1, Moan M, Aubry T. Effect of processing procedures and conditions on structural, morphological, and rheological properties of polyethylene/polyamide/nanoclay blends. Polym Eng Sci 2011 51 969-78. 

Several studies have been performed to evaluate the mixing capabilities of twin screw extruders. Noteworthy are two studies performed by Lim and White [12,13] that evaluated the morphology development in a 30.7 mm diameter screw co-rotating [28] and a 34 mm diameter screw counter-rotating [3] intermeshing twin screw extruder. In both studies they dry-mixed 75/25 blend of polyethylene and polyamide 6 pellets that were fed into the hopper at 15 kg/h. Small samples were taken along the axis of the extruder and evaluated using optical and electron microscopy. 

B.Y. Shin, D.H. Han, Morphological and mechanical properties of polyamide 6/linear low density polyethylene blend compatibilized by electron-beam initiated mediation process. Radiat. Phys. Chem. 97, 198-207 (2014)... 

A. Argoud, L. Trouillet-Eonti, S. Ceccia, P. Sotta, Morphologies in polyamide 6/high density polyethylene blends with high amounts of reactive compatibilizer. Eur. Polymer J. 50, 177-189 (2014)... 

While the number of styrenic blends might seem limitless, compatibility and morphology limit blend types. Styrenic blends are many but most are limited to only a couple types. The most important blend is ABS and polycarbonate (PC). Next in importance is ABS and polyamide (or nylon, PA). PS and polyethylene are often used in expandable foams. PS and polyphenylene ether (PPE or PPO) are commercially important blends, which are covered in later chapters. The other classes of the styrenic blends are not major product lines but can be very important in some applications. 

Fang, Z., Xu, Y., and Tong, L. (2007) Effect of day on the morphology of binary blends of polyamide 6 with high density polyethylene and HDPE-graft-acrybe add. PcHym. Eng. Sci., 47, 551. 

---