Strain-induced consolidation of partially disentangled polypropylene
The role of entanglement of polymer chains in the merging and consolidation of polypropylene (PP) powder grains was elucidated. The entanglement density was varied by the dissolution of PP and precipitation. The differently entangled powders were sintered, without melting, applying severe plastic de...
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| Format: | Article |
| Language: | English |
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Budapest University of Technology and Economics
2021-10-01
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| Series: | eXPRESS Polymer Letters |
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| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0011406&mi=cd |
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| author | A. Pawlak I. Vozniak J. Krajenta V. Beloshenko A. Galeski |
| author_facet | A. Pawlak I. Vozniak J. Krajenta V. Beloshenko A. Galeski |
| author_sort | A. Pawlak |
| collection | DOAJ |
| description | The role of entanglement of polymer chains in the merging and consolidation of polypropylene (PP) powder grains was elucidated. The entanglement density was varied by the dissolution of PP and precipitation. The differently entangled powders were sintered, without melting, applying severe plastic deformation by equal channel multiangular extrusion (ECMAE). Compaction by ECMAE resulted in healing of the interparticle pores, as well as the formation of a fibrillar structure, more significant in the case of disentangled PP. Lower entanglement density also led to the formation of thicker interfaces and to new crystals due to the strain-induced crystallization of slacks between entanglement knots. The consolidation of disentangled powder was drastically better than entangled PP powder: the yielding in compression occurred via crystallographic slips in the sintered disentangled powder while in the entangled PP powder through a series of weak elements and defects, due to much poorer compactness and cohesion. It was suggested that better consolidation of disentangled PP powder is due to reptation of longer slacks between entanglement knots and also due to sideway motions of their loops. |
| format | Article |
| id | doaj-art-24edb01a36e644fcbcb066a88e80f163 |
| institution | Kabale University |
| issn | 1788-618X |
| language | English |
| publishDate | 2021-10-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-24edb01a36e644fcbcb066a88e80f1632025-08-20T03:33:07ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2021-10-01151094095610.3144/expresspolymlett.2021.76Strain-induced consolidation of partially disentangled polypropyleneA. PawlakI. VozniakJ. KrajentaV. BeloshenkoA. GaleskiThe role of entanglement of polymer chains in the merging and consolidation of polypropylene (PP) powder grains was elucidated. The entanglement density was varied by the dissolution of PP and precipitation. The differently entangled powders were sintered, without melting, applying severe plastic deformation by equal channel multiangular extrusion (ECMAE). Compaction by ECMAE resulted in healing of the interparticle pores, as well as the formation of a fibrillar structure, more significant in the case of disentangled PP. Lower entanglement density also led to the formation of thicker interfaces and to new crystals due to the strain-induced crystallization of slacks between entanglement knots. The consolidation of disentangled powder was drastically better than entangled PP powder: the yielding in compression occurred via crystallographic slips in the sintered disentangled powder while in the entangled PP powder through a series of weak elements and defects, due to much poorer compactness and cohesion. It was suggested that better consolidation of disentangled PP powder is due to reptation of longer slacks between entanglement knots and also due to sideway motions of their loops.http://www.expresspolymlett.com/letolt.php?file=EPL-0011406&mi=cdprocessing technologiespolypropylenedisentanglementsinteringsolid state extrusion |
| spellingShingle | A. Pawlak I. Vozniak J. Krajenta V. Beloshenko A. Galeski Strain-induced consolidation of partially disentangled polypropylene eXPRESS Polymer Letters processing technologies polypropylene disentanglement sintering solid state extrusion |
| title | Strain-induced consolidation of partially disentangled polypropylene |
| title_full | Strain-induced consolidation of partially disentangled polypropylene |
| title_fullStr | Strain-induced consolidation of partially disentangled polypropylene |
| title_full_unstemmed | Strain-induced consolidation of partially disentangled polypropylene |
| title_short | Strain-induced consolidation of partially disentangled polypropylene |
| title_sort | strain induced consolidation of partially disentangled polypropylene |
| topic | processing technologies polypropylene disentanglement sintering solid state extrusion |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0011406&mi=cd |
| work_keys_str_mv | AT apawlak straininducedconsolidationofpartiallydisentangledpolypropylene AT ivozniak straininducedconsolidationofpartiallydisentangledpolypropylene AT jkrajenta straininducedconsolidationofpartiallydisentangledpolypropylene AT vbeloshenko straininducedconsolidationofpartiallydisentangledpolypropylene AT agaleski straininducedconsolidationofpartiallydisentangledpolypropylene |