Interfacial phenomena in core–shell nanocomposites of PDMS adsorbed onto low specific surface area fumed silica nanooxides: Effects of surface modification

Klonos, Panagiotis Α.; Sulym, Iryna; Kyriakos, Konstantinos; Vangelidis, Ioannis; Zidropoulos, Spilios; Sternik, Dariusz; Borysenko, M.V.; Kyritsis, Apostolos; Deryło–Marczewska, Anna; Gun'ko, V.М.; Pissis, P.

doi:10.1016/j.polymer.2015.05.017

Cited by 45 publications

(79 citation statements)

References 54 publications

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“…According to them [20,29], the average height of the BLL provides a good estimate for the thickness of the DIL that experiences slower dynamics. Considering the analogy between polymer thin films and PNCs [7,30], it is reasonable to anticipate a similar interfacial chain packing-dynamics relationship in PNCs [31,32]. Earlier theoretical studies have shown that the average height of the BLL increases with R g of the adsorbed polymer [8][9][10][11][12], and is also found to correlate well with the thickness of the DIL [18].…”

mentioning

confidence: 93%

Unexpected Molecular Weight Effect in Polymer Nanocomposites

et al. 2016

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mentioning

confidence: 93%

Unexpected Molecular Weight Effect in Polymer Nanocomposites

et al. 2016

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“…Samples were equilibrated in ambient conditions before measurements. Based on the results obtained, the cohesion energy (E coh , kJ mol -1 ) and the crystallization degree (X c , %) for neat polymers and the immobilized layer were evaluated [16,23].…”

Section: Silica Surface Modificationmentioning

confidence: 99%

“…Such study of immobilized PDMS-1000 allowed to establish that heterosites on silica surface increase the fraction of polymer chains at interfaces that is reflected in the respective dynamics (a int -relaxation) and enhanced cooperativity [16]. For the core-shell nanocomposites with high PDMS content (80 mass%), the interfacial relaxation was less affected by silica/polymer interaction [17].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, bulk dynamics (glass transition temperature-T g , and time scale of a relaxation) were not significantly affected. This effect has been widely studied [16][17][18][19], and authors proposed a model of bimodal conformations of polymers adsorbed on solid surfaces, in terms of an increase in the apparent thickness of the interfacial layer with increasing surface roughness. According to this model, the conformations of polymer chains during the first stage of adsorption are mostly linear (tails) with following formation of loop-like structures with polymer content increase.…”

Section: Introductionmentioning

confidence: 99%

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DSC study of silicas with immobilized polysiloxane layer of different architecture

Bolbukh

Koutsoumpis

Georgopoulos

et al. 2016

J Therm Anal Calorim

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Core-shell structured nanocomposites of polydimethylsiloxane with different polymerization degree (PMS100 and PMS50) and polymethylphenylsiloxane (PMPS4) immobilized onto fumed silica nanoparticles were studied by means of differential scanning calorimetry. The polysiloxanes were attached to the particles' surface using thermally stimulated binding and modification in the presence of depolymerization activator-dimethyl carbonate (DMC). Single-and multi-stage processes were applied in order to obtain a different architecture of polymeric layer on the silica nanoparticles surface. The effect of polysiloxane/DMC ratio on phase transitions of obtained polymeric layers was evaluated. The grafting of polydimethylsiloxane at the presence of chain scissor resulted in cross-linking of the attached polymeric layers. When using a multi-step modification with PMPS, a dense crosslinked layer was formed on the silica surface. Unlike the samples obtained by one-step modification with different polymer content, for which the amount of polymer attached to silica surface changes the parameters of the relaxation process in polymeric layer, for composites synthesized using multi-stage modification, a greater influence has the length of the oligomer introduced on first stage. The best results were achieved for composite with PMPS when using on the first stage of modification the PMPS/DMC mixture with low content of depolymerization agent (oligomers with long chain, respectively). A notable increase in the mobility of the polymeric layer was detected due to the formation of isotactic macromolecular chains.

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“…This paper introduced microsilica to obtain larger oil droplets and larger OAM microspheres eventually. Pure fumed silica is completely hydrophilic, and it cannot self-absorb on the oil/water interface [32][33][34]. However, fumed silica modified by a silane coupling agent is partly hydrophobic and can stabilize oil-in-water Pickering emulsion [35].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of core-shell oil absorption materials stabilized by modified fumed silica

Wang

Liu

et al. 2016

Journal of Polymer Engineering

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Abstract The core-shell oil absorption material (OAM) with fumed silica shell was achieved from Pickering polymerization. The modified fumed silica wall could well stabilize both Pickering emulsion and Pickering polymerization. The particle size of encapsulated OAMs decreased with the increasing concentration of fumed silica and remained unchanged when the concentration was more than 1 wt.%. This fumed silica shell had little effect on the oil absorption rate of OAM. The importance was that the shell reversed the surface property and improved the alkali resistance of OAM. We believe that our core-shell OAMs could reach the self-healing ability of the oil well cement.

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Interfacial phenomena in core–shell nanocomposites of PDMS adsorbed onto low specific surface area fumed silica nanooxides: Effects of surface modification

Cited by 45 publications

References 54 publications

Unexpected Molecular Weight Effect in Polymer Nanocomposites

Unexpected Molecular Weight Effect in Polymer Nanocomposites

DSC study of silicas with immobilized polysiloxane layer of different architecture

Preparation and characterization of core-shell oil absorption materials stabilized by modified fumed silica

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