UNIVERSI
TÄ
TS-
BIBLIOTHEK
P
ADERBORN
Anmelden
Menü
Menü
Start
Hilfe
Blog
Weitere Dienste
Neuerwerbungslisten
Fachsystematik Bücher
Erwerbungsvorschlag
Bestellung aus dem Magazin
Fernleihe
Einstellungen
Sprache
Deutsch
Deutsch
Englisch
Farbschema
Hell
Dunkel
Automatisch
Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist
gegebenenfalls
nur via VPN oder Shibboleth (DFN-AAI) möglich.
mehr Informationen...
Universitätsbibliothek
Katalog
Suche
Details
Zur Ergebnisliste
Ergebnis 10 von 281
Datensatz exportieren als...
BibTeX
Properties of polyimide hybrids with mixed metal oxide
Journal of applied polymer science, 2013-01, Vol.127 (1), p.145-153
Lu, Hsu-Tung
Huang, Shih-Liang
Tseng, I-Hsiang
Lin, Yin-Kai
Tsai, Mei-Hui
2013
Details
Autor(en) / Beteiligte
Lu, Hsu-Tung
Huang, Shih-Liang
Tseng, I-Hsiang
Lin, Yin-Kai
Tsai, Mei-Hui
Titel
Properties of polyimide hybrids with mixed metal oxide
Ist Teil von
Journal of applied polymer science, 2013-01, Vol.127 (1), p.145-153
Ort / Verlag
Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Erscheinungsjahr
2013
Link zum Volltext
Quelle
Wiley Online Library - AutoHoldings Journals
Beschreibungen/Notizen
Polyimide/silica–titania (PI/SiO2–TiO2) hybrid films were prepared via an in situ sol–gel process. The PI precursor, poly(amic acid) (PAA), which contains 2,2'‐bis[4‐(4‐aminophenoxy)‐phenyl]propane (p‐BAPPP), 3,3',4,4'‐ benzophenetetracarboxylic anhydride (BTDA) and 3‐aminopropyltrimethoxysilane (APrTMOS), was first synthesized; this was followed by the addition of phenyltrimethoxysilane (PTMS) and/or tetraethyl orthotitanate (Ti(OEt)4) to fabricate PI/SiO2–TiO2 films. The relative content of SiO2 to TiO2 has remarkable effects on the crosslink structure and resultant properties of the hybrids. XPS results confirm that the amount of Si on the surface of the hybrids is higher than that in the bulk. The distribution of Ti in the hybrid films is contrary to the above trend because of the formation of three‐dimensional SiOSi, SiOTi, and TiOTi networks. The SiO2 content of the hybrids containing only silica significantly affects their refractive index, contact angle, and dielectric constant. The films with added PTMS show higher contact angles than pure PI because nonpolar segments, C2H6 or benzene groups, tend to distribute on the surface. Upon the addition of (Ti(OEt)4), some hydrophilic segments on the surface of the hybrids are induced because of the formation of a crosslinked structure. The denser crosslinked molecular structure, and consequently lower CTE and higher Tg are obtained from hybrids containing more TiO2. By comparing the above properties and flexibility, the best composition of metal oxides (SiO2/TiO2) in hybrids is 20/80. That is, an optimum ratio of metal oxides in PI hybrids induces superior properties for advanced practical applications. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Sprache
Englisch
Identifikatoren
ISSN: 0021-8995
eISSN: 1097-4628
DOI: 10.1002/app.37865
Titel-ID: cdi_proquest_miscellaneous_1439762358
Format
–
Schlagworte
Applied sciences
,
Composites
,
Contact angle
,
Crosslinking
,
Exact sciences and technology
,
Forms of application and semi-finished materials
,
hybrid
,
Metal oxides
,
mixed metal oxide
,
Molecular structure
,
polyimide
,
Polyimide resins
,
Polymer industry, paints, wood
,
refractive index
,
Segments
,
Silicon dioxide
,
sol-gel
,
Technology of polymers
,
thermal properties
,
Titanium dioxide
Weiterführende Literatur
Empfehlungen zum selben Thema automatisch vorgeschlagen von
bX