Homogenization of blends of polypropylene and ethylene-propylene rubber under shear in the presence of inorganic fillers

Zhorin, V. A.; Kulakov, V. V.; Mironov, N.A.; Никольский, В.Г.; Chebotarevskii, A.E.; Yenikolopyan, N.S.

doi:10.1016/0032-3950(82)90208-8

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…12,19) The magnitude of HPT-induced re-structuring depends on the type of the polymer processed. 12,14,17,18) A substantial reduction of the molecular mass of homopolymers stemming from mechano-chemical destruction leads to a deterioration of their physical and mechanical. 11,19) By contrast, in the case of polymer mixtures the properties can be improved by HPT, owing to a pronounced comminution of phases, their more uniform distribution and the formation of new crystal structures (cocrystallites).…”

Section: High Pressure Torsionmentioning

confidence: 99%

“…However, a drop in these characteristics occurs upon further increase of the anvil angle. 18,19) HPT of hard monomers promotes the formation of macromolecular compounds. 16) The degree of polymerisation increases with growing pressure, process temperature, and the anvil rotation angle, i.e.…”

Section: High Pressure Torsionmentioning

confidence: 99%

“…HPT can also lead to homogenisation of blends of thermodynamically incompatible polymers, as was demonstrated for PP-PE and PP-ethylene propylene rubber mixtures. 15,18,19) This is associated with mutual dissolution of amorphous regions of the constituents of the polymer blend by HPT, which cannot be achieved by mixing in the melt. Gradual increase of interaction between the phases due to plastic flow during HPT causes a decrease of the size of the dispersion phase particles, which improves the physical and mechanical properties of the composite.…”

Section: High Pressure Torsionmentioning

confidence: 99%

“…Addition of inorganic fillers, such as aerosil, ash, and asbestos, enhances homogeneity of the mix and makes it possible to produce blends with the same glass transition temperature at lower pressures. 18) It should be noted, however, that polymer mixtures that underwent HPT processing are not thermally stable and are prone to phase separation and heterogenization upon annealing.…”

Section: High Pressure Torsionmentioning

confidence: 99%

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Severe Plastic Deformation of Polymers

et al. 2019

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Severe plastic deformation (SPD) has come to the fore over the last decades as a potent way to improve the mechanical and physical properties of metallic materials. The use of such techniques for polymers has a long history and can be proud of its significant achievements, but they are less familiar to the metal research community. This review provides insights in the use of SPD techniques to modify the microstructure and properties of polymers and summarizes the salient results obtained in this area. It is hoped that this exposé will be of interest to the broader materials community, beyond the borders of polymer research.

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Section: High Pressure Torsionmentioning

confidence: 99%

Section: High Pressure Torsionmentioning

confidence: 99%

Section: High Pressure Torsionmentioning

confidence: 99%

Section: High Pressure Torsionmentioning

confidence: 99%

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Severe Plastic Deformation of Polymers

et al. 2019

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“…Moreover, these changes directly influence the mechanical properties of polymers such as strength, elastic modulus, fracture toughness, etc. [45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Modeling and finite element simulation of polypropylene behavior under severe plastic deformation by high pressure torsion

Aour,

Draï,

Daikh

et al. 2024

Preprint

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SPD technology, also known as NanoSPD, is the most efficient way of producing nanomaterials. However, two processing methods have been investigated more intensively: high-pressure torsion (HPT) and equal channel angular pressing (ECAP). Today, the high pressure torsion is one of the most promising methods for producing large shear strain, and has been the subject of widely investigations as a new processing method for nanostructured materials due to their capability to apply infinitely large strains to the material and to deform materials to very high plastic deformations without significantly altering the cross-section of the sample. In this paper, a phenomenological elastic-viscoplastic constitutive model was experimentally identified, and, coupled with the three-dimensional finite element method (FEM) to examine the different processing parameters governing the deformation behavior of polypropylene (PP) during HPT process. The plastic deformation behavior of polypropylene (PP) resulting from HPT process was investigated. To this end, the impact of various HPT process parameters, such as phases enchainment or choice of sequence, imposed compressive displacement (pressure), torsion angle, angular velocity angle and sample dimensions, is presented. Based on the numerical results obtained, recommendations on process conditions were formulated at the end of this work.

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The melt compatibility of blends of polypropylene and ethylene‐propylene copolymers

Lohse

1986

Polymer Engineering & Sci

102

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Blends of polypropylene with ethylene‐propylene copolymers of various compositions have been studied by small angle neutron scattering with regard to their compatibility at room temperature and in the melt. It has long been known that such blends separate into distinct phases at lower temperatures due to the crystallinity of the isotactic polypropylene, The work described herein has shown that these blends are also immiscible in the melt, even where the ethylene content of the copolymer is as low as 8 percent. Moreover, the separated phase domains grew rapidly at melt temperatures. Blends of atactic polypropylene with isotactic polypropylene did become miscible upon melting.

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Homogenization of blends of polypropylene and ethylene-propylene rubber under shear in the presence of inorganic fillers

Cited by 7 publications

References 1 publication

Severe Plastic Deformation of Polymers

Severe Plastic Deformation of Polymers

Modeling and finite element simulation of polypropylene behavior under severe plastic deformation by high pressure torsion

The melt compatibility of blends of polypropylene and ethylene‐propylene copolymers

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