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Dynamic behavior of crosslinked amphiphilic block copolymer nanofibers dispersed in liquid poly(ethylene oxide) below and above their glass transition temperature

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Soft Matter Vol - 9 Issue - 6

Soft Matter Vol - 9 Issue - 5

Dynamic behavior of crosslinked amphiphilic block copolymer nanofibers dispersed in liquid poly(ethylene oxide) below and above their glass transition temperature

Content Provider	Royal Society of Chemistry (RSC)
Author	Charleux, Bernadette Cassagnau, Philippe Zhang, Wenjing
Copyright Year	2013
Abstract	Crosslinked polystyrene nanofibers were synthesized via RAFT-mediated aqueous emulsion polymerization and showed good shape stability in both the presence of solvent and at high temperature (typically above the Tg of polystyrene). The viscoelastic properties of their suspension in a low molar mass poly(ethylene glycol) matrix (PEG400) was studied as a function of the temperature, i.e., below the Tg of polystyrene at 25 °C, and above at 130 °C. Below Tg, the critical concentration ϕ* between the dilute and the semi-dilute regimes determined from the crossover of the scaling law on the zero shear viscosity for the dilute regime and the semi-dilute regime showed that a Brownian motion of the nanofibers was the dominant mechanism of relaxation according to the Doi–Edwards theory. Above Tg, the nanofibers are flexible and their Brownian dynamics did not obey the Doi–Edwards theory anymore. From the concentration dependence of the zero shear viscosity, it appeared that their dynamics obey the power laws for polymer chains in solution. Moreover, the flow activation energy at T > Tg was drastically dependent on the nanofiber concentrations whereas it was observed to be constant at T < Tg as expected from the Doi–Edwards theory. Finally, the flow activation energy became closer to the flow activation energy of polystyrene at concentrations above ϕ = 15%. Such qualitative agreement with the dynamics of flexible chains has never been observed before and might be fortuitous; it would therefore require further theoretical investigations.
Starting Page	2197
Ending Page	2205
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	7
Journal	Soft Matter
DOI	10.1039/c2sm27602j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Viscoelasticity Viscosity Ethylene glycol Brownian dynamics Molar mass Polymer Nanofiber Polystyrene Brownian motion Emulsion polymerization Edwards Extracellular matrix Correlation and dependence Solvent Activation energy
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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