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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.8b01580
|2 doi
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|a pubmed24n0956.xml
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|a eng
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| 100 |
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|a Protsak, Iryna
|e verfasserin
|4 aut
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|a Cleavage of Organosiloxanes with Dimethyl Carbonate
|b A Mild Approach To Graft-to-Surface Modification
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|c 2018
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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 17.10.2018
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|a Date Revised 17.10.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a In this work, we explore the depolymerization of poly(dimethylsiloxane) (PDMS-100) and poly(methylphenylsiloxane) (PMPS) using dimethyl carbonate (DMC) and develop a surface functionalization method by utilizing the DMC-imparted active methoxy end groups of the partially depolymerized polysiloxanes. The efficiency of dimethyl carbonate as a reagent for organosiloxane cleavage was confirmed by means of 1H NMR spectroscopy, size-exclusion chromatography, and viscosity measurements. The reaction of fumed silica with organosiloxanes (PMPS, PDMS-50) in the presence of DMC was investigated using the ζ-potential, 29Si and 13C solid-state NMR spectroscopy, IR spectroscopy, CHN analysis, contact angle goniometry, thermogravimetric analysis, scanning and transmission electron microscopy (TEM), and rheology. It was found that the interaction of PMPS/DMC with an SiO2 surface produced hydrophobic and thermally stable moieties (up to 550 °C) with a densely packed (average 2.2 groups/nm2) alkylsiloxane network for SiO2/PMPS + DMC in comparison with SiO2/PMPS (average 1.4 groups/nm2). Surface functionalization was successfully attained at a relatively moderate temperature of 200 °C. Scanning electron microscopy data show that the average size of aggregates of PMPS/DMC-modified silica nanoparticles is smaller than that of the initial silica and silica modified with neat PMPS. TEM images reveal uniform distribution of the PMPS/DMC mixture across the SiO2 surface. Rheology studies show thixotropic behavior in industrial oil (I-40A), a fully reversible nanostructure and shorter structure recovery time for fumed silica modified in the presence of DMC
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Henderson, Ian M
|e verfasserin
|4 aut
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|a Tertykh, Valentyn
|e verfasserin
|4 aut
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|a Dong, Wen
|e verfasserin
|4 aut
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|a Le, Zi-Chun
|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 34(2018), 33 vom: 21. Aug., Seite 9719-9730
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:34
|g year:2018
|g number:33
|g day:21
|g month:08
|g pages:9719-9730
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|u http://dx.doi.org/10.1021/acs.langmuir.8b01580
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