Morphogenesis of polyolefin particles in polymerization reactors

Horackova, Blanka; Košek, Juraj

doi:10.1016/s1570-7946(06)80199-9

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Logically, the mechanical properties of the support material will influence the fragmentation step. Studies on the modeling of fragmentation and the evolution of particle morphology − clearly show that the mechanical properties of the polymer play a determining role in how the original particle breaks up and on how the growing particle expands. This is because the mechanical properties influence the way the tensions produced by the polymer accumulation into the pores are stored and released .…”

Section: Introductionmentioning

confidence: 99%

“…This is because the mechanical properties influence the way the tensions produced by the polymer accumulation into the pores are stored and released . The rate of reaction will also have an impact on the fragmentation stage and the resulting particle morphology for similar reasons. − The crystallinity of the polymer will influence the rate indirectly since the diffusion coefficient of the monomer through the polymer layer covering the active sites is strongly dependent on this property …”

Section: Introductionmentioning

confidence: 99%

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Morphological Interpretation of the Evolution of the Thermal Properties of Polyethylene during the Fragmentation of Silica Supported Metallocene Catalysts

2012

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Gas phase ethylene polymerizations on supported metallocene catalysts have been carried out in a stopped flow minireactor for times as short as 0.3 s. By recovering the polymer particles without altering their morphology it was possible to follow the evolution of the thermal properties of the polymer during the fragmentation of the particles. The melting temperature increased with reaction time (from 118 °C at 0.3 s to 131 °C at 180 s), and three distinct crystallization peaks can be observed during the studied time range, centered on 75 °C for very short reactions, 105 °C for longer reactions, and 115 °C (the usual crystallization temperature of HDPE) which becomes predominant only after 30 s of reaction. It is believed that the reason for this behavior is related to the confinement of the nascent polymer in the nanopores of the catalyst support. This confinement perturbs the chain crystallization by limiting the crystal growth. It is shown that measuring the thermal properties of the reactor powder without removing the support fragments allows one to identify in which pores the nascent polymer forms and to follow the progress of particle fragmentation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphological Interpretation of the Evolution of the Thermal Properties of Polyethylene during the Fragmentation of Silica Supported Metallocene Catalysts

2012

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Polymer Particle Growth and Process Engineering Aspects

Bartke

2008

Tailor‐Made Polymers

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Single Particle Growth, Fragmentation and Morphology Modelling: A DEM Approach

Soleimani

Aigner

Touloupidis

2022

Macro Reaction Engineering

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In this work, the development of a 3D discrete element method (DEM) modeling concept and application that can describe and explain the catalyst particle growth and fragmentation mechanism and follow the morphology developments is presented. The proposed unified modeling methodology is able to predict the expected particle morphology in terms of exact shape, size, and porosity, taking into account the major contributing effects, including reaction kinetics, thermodynamics as well as mechanical considerations. The developed DEM model is validated based on indicative particle morphology patterns as captured experimentally via the SEM technique, managing to qualitatively predict the observed particle morphology. These results indicate the potential of DEM approach in polymer reaction engineering (PRE), expanding the simulation capabilities and range of application.

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Morphogenesis of polyolefin particles in polymerization reactors

Cited by 3 publications

References 10 publications

Morphological Interpretation of the Evolution of the Thermal Properties of Polyethylene during the Fragmentation of Silica Supported Metallocene Catalysts

Morphological Interpretation of the Evolution of the Thermal Properties of Polyethylene during the Fragmentation of Silica Supported Metallocene Catalysts

Polymer Particle Growth and Process Engineering Aspects

Single Particle Growth, Fragmentation and Morphology Modelling: A DEM Approach

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