Investigation of the morphology of polymer mixtures depending on flow conditions of melts

Krasnikova, N. P.; Kotova, E. V.; Vinogradov, G. V.; Pelzbauer, Z.

doi:10.1002/app.1978.070220728

Cited by 24 publications

(6 citation statements)

References 7 publications

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“…It was found that a melting peak area is linearly proportional to the blend composition indicating [12] a high degree of dispersion in the blends prepared by injection molding using a screw static mixer. In blends of atactic polystyrene with isotactic polypropylene a fibril-like morphology was observed [6]. The fibrils of isotactic polypropylene had a spherulite structure and they were well oriented in the flow direction.…”

Section: Introductionmentioning

confidence: 95%

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Miscibility of isotactic polypropylene with atactic polystyrene

Mucha¹

1986

Colloid & Polymer Sci

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Abstract:The miscibility ofisotactic polypropylene-atactic polystyrene blends using dilatometric, TOA, DAT and stress-strain methods were studied. It appears that the blends are heterogeneous, having two glass transition temperatures. However, some interactions between components are evident to change the Tgs of their amorphous phases and the Tm of isotactic polypropylene crystals. The results are discussed on the basis of the blends' thermal and tensile properties.

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Section: Introductionmentioning

confidence: 95%

“…Recently the morphology and physical properties of isotactic polypropylene -atactic polystyrene blends were investigated [6,12,23,24]. It was found that a melting peak area is linearly proportional to the blend composition indicating [12] a high degree of dispersion in the blends prepared by injection molding using a screw static mixer.…”

Section: Introductionmentioning

confidence: 99%

Miscibility of isotactic polypropylene with atactic polystyrene

Mucha¹

1986

Colloid & Polymer Sci

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“…Research regarding the extrusion of polymer blends in the past has concentrated primarily on capillary dies (28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42). The focus has been to achieve orientation of the dispersed phase in the direction of flow, and the studies suggest the formation of a variety of morphologies (droplets, fibers, telescopic tubular structures, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Krasnikova et al [34] investigated a pp and PS mixture (33/ 67vol%), in which the viscosities of pp and PS were close to each other. Morphological analysis revealed that the formation of samples under conditions providing fewer possibilities of relaxation, such as low ambient temperature at the capillary outlet, decrease in the capillary length, or increase in the shear strain, gave rise ta thinner pp fibrils arranged in layers in the PS matrix.…”

Section: B) Capillary Flowmentioning

confidence: 99%

“…Han [29] PS/PP Danesi [30] PP/EP Vinogradov POM/CPA [31][32][33] Krasnikova PP/PS [34] Tsebrenko POM/CEVAc [35] Lyngaae-PE/PP Jorgensen À<l,""l À""l Table 2.6). Micrographs of samples produced under controlled processing conditions (blow-molded container and extruded sheet) showed that the nylon material was not distributed as a homogeneous, unifcrm blend, ~ut rather as multiple layers, or platelets, along the wall thickness.…”

Section: B) Capillary Flowmentioning

confidence: 99%

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Morphology and permeability in extruded polypropylene/ethylene vinyl‐alcohol copolymer blends

Lohfink

Kamal

1993

Polymer Engineering & Sci

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ABSTRACTstudies of ~he morphology of extruded polyrner blend syst~ms have shawn that it is feasible to produce a laminar structure of an ethylene vinyl-alcohr-l copolymer (EVOH) dispersed phase in a po1yprapylene (PP) m~trix phase. The laminar structure forms in the core of the extrudate when a 5lit die 1s incorporated into the extrusion process.Morphological studies, including a study of morphology d~vel opment inside the die and studies of the effect of processing conditions on the morphology of the final product, :evealed that the laminar structure is a resul t of die design. Processing conditions influence main1y the shape and dimensions of the laminnr core region of the extrudate.Oxygen permeation tests have shown that the blend e:,hibits lower oxygen permeability than pure PP, when EVOH is incorporated as a dispersed phase into the system. Oxygen transmission rates obtained with a blend system can be as low as those obtained with a mUlti-layer coextrusion product, although only at h~gh EVOH concentrations. Comparison of experimental data with theoretical permeation predictions shows that, up to 20wt% EVOH, the reduction in oxygen transmission rate is on1y minor, and follows the prediction for a homogeneous system. At 25wt%, a considerable decrease in oxygen transmission rate is noticeable, and the tr'end for higher EVOH contents is towards the behavior of a multi-layer system .

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Light scattering and optical microscopy as in-line probes of polymer blend extrusion

Hobbie

Migler

Han

et al. 1998

Adv. Polym. Technol.

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A light‐scattering photometer with optical microscope for in situ morphological studies of extruded polymer blends is described. The optics for light scattering and microscopy can be switched back and forth via simple translation of a rail‐mounted optical platform without realignment, allowing efficient measurements in both real and reciprocal space during polymer processing. Blends of polystyrene and polyethylene are used to demonstrate the performance and versatility of the instrument. © 1998 John Wiley & Sons, Inc. Adv Polym Techn 17: 307–316, 1998

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Investigation of the morphology of polymer mixtures depending on flow conditions of melts

Cited by 24 publications

References 7 publications

Miscibility of isotactic polypropylene with atactic polystyrene

Miscibility of isotactic polypropylene with atactic polystyrene

Morphology and permeability in extruded polypropylene/ethylene vinyl‐alcohol copolymer blends

Light scattering and optical microscopy as in-line probes of polymer blend extrusion

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