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Self-healing polymer nanocomposites based on Diels-Alder-reactions with silica nanoparticles: The role of the polymer matrix

Self-healing nanocomposites were studied consisting of surface-functionalized silica nanoparticles and polymers with different glass transition temperatures. The silica nanoparticles were synthesized using the Stöber process and afterwards surface-functionalized with the coupling agents 2-furyl-(und... Full description

Contained in: Polymer. The international Journal for the Science and Technology of Polymers and Biopolymers Vol. 69 (2015), p. 357-368
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Links: Additional Link (dx.doi.org)
Additional Keywords: BEWEGLICHKEIT
GLASUEBERGANGSTEMPERATUR
METHACRYLSAEUREESTER
NANOKRISTALLINER-VERBUNDWERKSTOFF
NANOPARTIKEL
POLYMERMATRIX
QUERVERNETZUNGSMITTEL
RHEOLOGIE
SILICIUMDIOXID
SILICON:POLYMER
DOI: 10.1016/j.polymer.2015.03.017
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 12 Seiten, 26 Quellen
ID (e.g. DOI, URN): 10.1016/j.polymer.2015.03.017
PPN (Catalogue-ID): WTI056997477
Note: WTI TEMA DB
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520 |a Self-healing nanocomposites were studied consisting of surface-functionalized silica nanoparticles and polymers with different glass transition temperatures. The silica nanoparticles were synthesized using the Stöber process and afterwards surface-functionalized with the coupling agents 2-furyl-(undecenyl)-11-triethoxysilane or 3-maleimidopropyltriethoxysilane. The obtained nanoparticles were studied as cross-linking agents in thermally triggered self-healing nanocomposites based on Diels-Alder (DA) chemistry. Cross-linking of the nanoparticles with modified poly(butyl methacrylates) containing DA groups revealed that the rigid thermoplasts show only low tendency to undergo the cross-linking reactions. Contrary, similarly modified polysiloxanes display thermally reversible cross-linking in DSC as well as in rheology measurements. The results reveal that a specific extent of mobility and flexibility of the polymer backbones is crucial for a reasonable fast self-healing process if Diels-Alder groups are used as crosslinking agents. [Copyright Elsevier B.V. Reproduced with permission.] 
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