Aplikovaná reologie pro produkci polymerních nanovláken pomocí technologie melt blown

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F18%3A63520664" target="_blank" >RIV/70883521:28110/18:63520664 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Aplikovaná reologie pro produkci polymerních nanovláken pomocí technologie melt blown
Original language description
Dynamics of linear polypropylene (L-PP) and long-chain branched polypropylene (LCB-PP) miscible blends was investigated via high shear rate rheology. High-shear rate secondary Newtonian plateaus, η∞, were identified at three different temperatures for well entangled L-PP/LCB-PP blends above shear rates of 2·106 1/s and their dependence on weight average molecular weight, Mw, was successfully related as η∞(T)=K∞(T)·Mw n with the exponent n = 1.010. Interestingly, the temperature dependent proportionality constant K∞ was found to be about 10–20% lower for the blend in comparison with the pure L-PP whereas the parameter n was found to be the same for both systems. It has been suggested that polymer chains are fully disentangled at very high shear rates and chain branching can enhance the flow in this regime due to smaller coil size and higher availability of the free volume (i.e. due to lower monomeric friction coefficient) in comparison with their linear counterparts.
Czech name
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Czech description
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Project
<a href="/en/project/GA16-05886S" target="_blank" >GA16-05886S: Investigation the effect of polymer melt shear and elongational rheology on production stability of meltblown nanofibers and films</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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