Influence of polymer reprocessing cycles on the microstructure and rheological behavior of polypropylene/mineral oil oleogels |
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| Affiliation: | 1. Departamento de Ingeniería Química, Química Física y Química Orgánica, Campus de “El Carmen”, Universidad de Huelva, 21071 Huelva, Spain;2. Pro2TecS – Chemical Process and Product Technology Research Center, 21071 Huelva, Spain;1. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, PR China;2. Tomsk Polytechnic University, Savinykh St., 7, Tomsk 634028, Russia;3. Tomsk State University, Lenin Av., 36, Tomsk 634050, Russia;1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Liaoning Key Laboratory of Polymer Science and Engineering, Dalian University of Technology, Dalian, 116024, China;2. South China Advanced Institute of Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, 510640, China;3. Sinosteel Anshan Research Institute of Thermo-Energy Co.Ltd, Anshan, 114044, China;1. Faculty of Biotechnology and Food Engineering, Technion – Israel Institute of Technology, Haifa, Israel;2. Russell-Berrie Nanotechnology Institute, Technion – Israel Institute of Technology, Haifa, Israel;1. Departamento de Ingeniería Química, Química Física y Química Orgánica, Campus de “El Carmen”, Universidad de Huelva, Huelva 21071, Spain;2. Pro2TecS—Chemical Process and Product Technology Research Center, Huelva 21071, Spain |
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| Abstract: | The overall objective of this work was to study the effect of reprocessing cycles of isotactic polypropylene (PP) on the rheological behavior and microstructure of gel-like dispersions in mineral oil. PP was subjected to 10 reprocessing cycles and oleogel samples were further prepared by using the mixing rheometry technique and characterized from a rheological point of view and polarized light optical microscopy (PLOM). Recycled polymer samples were also characterized by means of rheological measurements, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) to evaluate the property changes induced by reprocessing. The values of different linear viscoelastic functions (elastic modulus and complex viscosity) of recycled PP decrease with the number of reprocessing cycles, which influences oleogel rheological response. An empirical exponential correlation between the storage modulus (G′) of PP samples and the plateau modulus () of oleogels has been proposed to predict the rheological behavior of oleogels. Results were explained considering the scission of PP chains induced by the thermomechanical reprocessing treatment applied. |
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| Keywords: | Polypropylene Mineral oil Oleogels Reprocessing Degradation Viscoelastic properties |
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