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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.5b00255
|2 doi
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|a pubmed24n0822.xml
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|a (NLM)25738746
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a McDonald, Samila
|e verfasserin
|4 aut
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| 245 |
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|a Interfacial and bulk nanostructure of liquid polymer nanocomposites
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|c 2015
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 20.05.2015
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|a Date Revised 31.03.2015
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Liquid polymer nanocomposites (l-PNCs) have been prepared using silica nanoparticles with diameters of 15 nm (l-PNC-15) and 24 nm (l-PNC-24), and Jeffamine M-2070, an amine-terminated ethylene oxide/propylene oxide (PEO/PPO, ratio 31/10) copolymer. Jeffamine M-2070 was used as the host liquid in which the particles were suspended and was also grafted onto the particle surface to prevent aggregation. The grafting density of Jeffamine M-2070 on the particle surfaces was ∼0.75 chains nm(-2). When the total polymer content (surface layer + host) was greater than ∼30 wt %, the PNC was a liquid, while at lower polymer volume fractions the PNC was solid. In this work, the bulk and surface structures of l-PNCs with ∼70 wt % polymer and 30% silica are characterized and compared. Small-angle neutron scattering (SANS) was used to probe the bulk structure of the l-PNCs and revealed that the particles are well-dispersed with minor clustering in l-PNC-15 and substantial clustering in l-PNC-24. This is attributed to stronger van der Waals attractions between particles due to the larger particle size in l-PNC-24. Corresponding effects were revealed using tapping mode atomic force microscopy (TM-AFM) at the l-PNC-air interface; clustering was minimal on the surface of l-PNC-15 but significant for l-PNC-24 droplets. In regions of the l-PNC where the particles were well-dispersed, the spacing between particles is consistent with their volume fractions. This is the first time that the distribution of polymer and particles within l-PNCs has been imaged in situ
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|a Journal Article
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|a Wood, Jared A
|e verfasserin
|4 aut
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1 |
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|a FitzGerald, Paul A
|e verfasserin
|4 aut
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|a Craig, Vincent S J
|e verfasserin
|4 aut
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|a Warr, Gregory G
|e verfasserin
|4 aut
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|a Atkin, Rob
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 31(2015), 12 vom: 31. März, Seite 3763-70
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:31
|g year:2015
|g number:12
|g day:31
|g month:03
|g pages:3763-70
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|u http://dx.doi.org/10.1021/acs.langmuir.5b00255
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