Publication:
Effect of polymer molecular weight and deposition temperature on the properties of silica aerogel/hydroxy-terminated poly(dimethylsiloxane) nanocomposites prepared by reactive supercritical deposition

dc.contributor.coauthorN/A
dc.contributor.departmentDepartment of Chemical and Biological Engineering
dc.contributor.departmentKUTEM (Koç University Tüpraş Energy Center)
dc.contributor.kuauthorErkey, Can
dc.contributor.kuauthorŞanlı, Deniz
dc.contributor.schoolcollegeinstituteCollege of Engineering
dc.contributor.schoolcollegeinstituteResearch Center
dc.date.accessioned2024-11-09T23:44:14Z
dc.date.issued2015
dc.description.abstractMonolithic nanocomposites of silica aerogels with hydroxy-terminated poly(dimethylsiloxane) (PDMS(OH)) were prepared by reactive supercritical deposition technique. The depositions were performed by using PDMS(OH) having two different molecular weights (M-n = 2750 g/mol and 18,000 g/mol) and at three different temperatures (313.2 K, 323.2 K, 333.2 K) and the effects of deposition temperature and polymer molecular weight on the properties of nanocomposites were investigated. The polymer uptake of the nanocomposites was found to increase with increasing deposition temperature indicating faster reaction rates at higher temperatures. PDMS(OH) molecules with lower molecular weight were homogenously distributed throughout the cylindrical composites. On the other hand, the samples that were deposited with high molecular weight PDMS(OH) were not homogenous with a higher polymer concentration near the surface than at the center. The pore volumes and BET surface areas of the nanocomposites decreased upon deposition of the polymer. The reductions in pore volumes were higher by a factor of two than the volume of the deposited polymer indicative of blocking of pores. Moreover, the compressive modulus of the nanocomposite was found to be more than three times greater than the compressive modulus of the native silica aerogel.
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.openaccessNO
dc.description.sponsoredbyTubitakEuN/A
dc.description.sponsorshipEuropean Union [NMP4-SL-2010-260086] This work was funded by the European Union Seventh Framework Program (FP7/2007 - 2013) under grant agreement no. NMP4-SL-2010-260086.
dc.description.volume105
dc.identifier.doi10.1016/j.supflu.2014.12.010
dc.identifier.eissn1872-8162
dc.identifier.issn0896-8446
dc.identifier.scopus2-s2.0-84920172769
dc.identifier.urihttps://doi.org/10.1016/j.supflu.2014.12.010
dc.identifier.urihttps://hdl.handle.net/20.500.14288/13630
dc.identifier.wos363350700014
dc.keywordsCompressive modulus
dc.keywordsHydroxy-terminated poly(dimethylsiloxane)
dc.keywordsReactive supercritical deposition
dc.keywordsSilica aerogels
dc.keywordsPhysical adsorption characterization
dc.keywordsBinary diffusion-coefficients
dc.keywordsAmine-modified silica
dc.keywordsCarbon-dioxide
dc.keywordsNanoporous materials
dc.keywordsAerogels
dc.keywordsSolubility
dc.keywordsProgress
dc.language.isoeng
dc.publisherElsevier Science Bv
dc.relation.ispartofJournal Of Supercritical Fluids
dc.subjectChemistry
dc.subjectPhysical chemistry
dc.subjectEngineering
dc.subjectChemical engineering
dc.titleEffect of polymer molecular weight and deposition temperature on the properties of silica aerogel/hydroxy-terminated poly(dimethylsiloxane) nanocomposites prepared by reactive supercritical deposition
dc.typeConference Proceeding
dspace.entity.typePublication
local.contributor.kuauthorŞanlı, Deniz
local.contributor.kuauthorErkey, Can
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