Blends of thermoplastic polyurethane and maleic‐anhydride grafted polyethylene. I: Morphology and mechanical properties

Pötschke, Petra; Wallheinke, Katrin; Stütz, Herbert

doi:10.1002/pen.11492

Cited by 37 publications

(20 citation statements)

References 18 publications

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“…any researchers have shown that the size of the M dispersed phase in polymer blends increases with the increase of the dispersed phase fraction (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). However, it has been also reported that at high dispersed phase fractions, particle sizes of blends with high viscosity ratio (i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of the dispersed phase fraction on particle size in blends with high viscosity ratio

Cho

Kamal

2002

Polymer Engineering & Sci

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It has been reported that for polymer blends with high viscosity ratio (> 1) , the size of the dispersed particles decreases with increasing volume fraction of the dispersed phase. In order to explain this effect, an equation was derived for the &e deformation of an imaginary plane of the dispersed phase in stratified two-phase steady, simple, shear flow. The model predicts that for viscosity ratio >1, the deformation rate increases with volume fraction of the dispersed phase, and the shear stress also increases, leading to an increase of the breakup time. Therefore, the total deformation of the dispersed phase, before breakup, increases with increase of volume fraction, resulting in a decrease of the size of the dispersed phase particles. Accordingly, one can expect that in industrial mixers, the particle size of the blends should decrease as the volume fraction increases, if coalescence is suppressed. Experiments were carried out in a Haake batch mixer, using polyethylene/polyamide-6 blends compatibilized by adding maleic anhydride grafted polyethylene. Particle size decreased u p to 20 wtYo polyamide-6, at 100, 150, and 200 RPM, and increased between 20 and 30 wtYo. The decrease of the particle size is mainly due to increased deformation of the dispersed phase. The increase of the particle size above 20 wtYo is due to coalescence at high fractions.

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Section: Introductionmentioning

confidence: 99%

Effect of the dispersed phase fraction on particle size in blends with high viscosity ratio

Cho

Kamal

2002

Polymer Engineering & Sci

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“…Because of the enough long and flexible molecular chains, EPDM chains can entangle among themselves and also with the TPU chains. This entanglement impedes severely with the flow of the melt at low shear rates, and consequently, the viscosity becomes higher 33. However, the disentangling effect is much greater that entangling one at high shear rates, because the repulsion between EPDM chain and the hard segments of TPU arises from incompatibilizaton of both of them 34.…”

Section: Resultsmentioning

confidence: 99%

Influence of processing conditions on dual‐phase continuous blend system of thermoplastic polyurethane with ethylene‐propylene‐diene monomer elastomer

Lei

Luο

Wang

2006

J of Applied Polymer Sci

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In the present work, we extend the investigation on the influence of processing conditions on the morphology, the mechanical properties, and the rheology of the blends of thermoplastic polyurethane (TPU) and ethylene-propylene-diene monomer elastomer (EPDM). Scanning and transmission electron microscopies show that the dual-phase continuous morphology of the blends was strongly dependant on the EPDM composition, processing temperature, and the shear rates. The network structure of the EPDM domain in TPU matrix became finest and most regular for the blends containing 7 wt % EPDM. It was also found that high shear rate favored the formation of the perfect network structure. Furthermore, the blends prepared at 1808C present finer and more perfect network structure than those at the other processing temperatures. The competition of compatible and incompatible segments of TPU with EPDM during melt blending plays an important role in development of the dual-phase continuous morphology. This was reflected through the influence of processing conditions on the rheological properties, and was also verified by the Davies equation's prediction. The tensile properties present a significant improvement with addition of EPDM, and obtained the optimum value for the blends containing 7 wt % EPDM. The influence of different processing parameters on the mechanical properties is associated with their influence on the morphology, and better tensile properties are obtained in the processing conditions, in which, the finer and more perfect network structure of EPDM domain is presented. These facts confirm that the dual-phase continuous morphology is the main advantage for higher tensile strength, elongation at break, and Young's modulus can be well controlled by different processing conditions for the improvement of mechanical properties.

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“…The crosslinking of polyethylene can be avoided by using technologies of pre-irradiation and reactive extrusion grafting (12). Grafting of the nonsaturated monomers containing functional groups to olefin polymer macromolecules aimed to create functional polymers is widely applicable in present-day chemistry, chemical technologies, and polymer materials' science (13)(14)(15)(16)(17). The monomers often used for grafting copolymerization are maleic anhydride, acrylic acid, and its derivatives and so on (18)(19)(20)(21)(22)(23)(24)(25)(26).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Melt Grafting 2-acrylamido-2-methyl-1-propanesulfonic Acid onto Pre-Irradiated Linear Low Density Polyethylene

Yao

et al. 2009

Journal of Macromolecular Science, Part A

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Linear low density polyethylene (LLDPE) was functionalized with 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) by using β-ray pre-irradiation in air in a twin-screw extruder. Fourier-transformed infrared spectroscopy (FT-IR) and electron spectroscopy for chemical analysis (ESCA) were used to characterize the formation of LLDPE-g-AMPS copolymers. The content of AMPS in LLDPE-g-AMPS was determined by using element analysis instrument. The effects of concentrations of monomer, reaction temperature and pre-irradiation dose on degree of grafting were investigated. The critical surface tension of LLDPE-g-AMPS was measured by using contact angle method. The influences of the degree of grafting on crystallization properties were studied by using DSC. Compared with neat LLDPE, the crystallization temperature increased about 4 • C, and crystallinity decreased with increasing degree of grafting. Crystallization rates of grafted LLDPE were faster than that of plain LLDPE at the same crystallization temperature.

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Blends of thermoplastic polyurethane and maleic‐anhydride grafted polyethylene. I: Morphology and mechanical properties

Cited by 37 publications

References 18 publications

Effect of the dispersed phase fraction on particle size in blends with high viscosity ratio

Effect of the dispersed phase fraction on particle size in blends with high viscosity ratio

Influence of processing conditions on dual‐phase continuous blend system of thermoplastic polyurethane with ethylene‐propylene‐diene monomer elastomer

Preparation and Characterization of Melt Grafting 2-acrylamido-2-methyl-1-propanesulfonic Acid onto Pre-Irradiated Linear Low Density Polyethylene

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