Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Network formation and thermal stability enhancement in evolutionary crosslinked PDMS elastomers with sol-gel-formed silica nanoparticles: Comparativeness between as-received and pre-hydrolyzed TEOS
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymeric Materials.
Show others and affiliations
2017 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 113, p. 117-125Article in journal (Refereed) Published
Abstract [en]

Filler formation and crosslinking normally take place in PDMS/TEOS elastomers yielded via sol-gel technique, while a few was reported about the competitiveness between such phenomena. A combined rheological/thermogravimetric analysis was applied in this work varying the curing time (8, 24, 48, 72, and 168 h) to track and compare silica formation as well as three-dimensional elastomer networks in PDMS matrices treated with as received and pre-hydrolyzed TEOS. It was found that use of pre-hydrolyzed TEOS facilitates nanosilica formation leading to in-situ formation of nanocomposites exhibiting higher thermal stability and mechanical properties, as compared with the reference elastomers prepared at stoichiometric ratio. Silica formation was detected by means of TEM. Experimental results showed that during the first 8 h of the reaction between PDMS and as received TEOS a three-dimensional network was formed, while silica precipitation was dominant when PDMS was treated with pre-hydrolyzed TEOS. Tensile measurements reveal that silica precipitation in non-stoichiometric samples enhances tensile strength and elongation at break compared to the samples prepared at stoichiometric ratio, especially for samples cured with pre-hydrolyzed TEOS. Silica domain size was ca. 150 and 200 nm for the networks cured with TEOS and pre-hydrolyzed TEOS, respectively.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2017. Vol. 113, p. 117-125
Keywords [en]
Nanosilica formation, PDMS, Thermogravimetric analysis (TGA), Network formation, Thermal stability
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-217401DOI: 10.1016/j.porgcoat.2017.08.012ISI: 000414114700012Scopus ID: 2-s2.0-85029544172OAI: oai:DiVA.org:kth-217401DiVA, id: diva2:1159084
Note

QC 20171121

Available from: 2017-11-21 Created: 2017-11-21 Last updated: 2017-11-21Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Gedde, Ulf W

Search in DiVA

By author/editor
Gedde, Ulf W
By organisation
Polymeric Materials
In the same journal
Progress in organic coatings
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 30 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf