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Autorzy (4)

• AGHOlejarka-Połcik Justyna
• AGHŁącz Agnieszka
• Olejniczak Zbigniew
• AGHHasik Magdalena

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Dane bibliometryczne

ID BaDAP	111484
Data dodania do BaDAP	2018-01-16
Tekst źródłowy	URL
DOI	10.1016/j.eurpolymj.2017.12.018
Rok publikacji	2018
Typ publikacji	artykuł w czasopiśmie
Otwarty dostęp
Czasopismo/seria	European Polymer Journal

Abstract

In the work, polyhydromethylsiloxane (PHMS) was cross-linked with two vinylsilazanes: 1,1,3,3-tetramethyl-1,3-divinyldisilazane (ViSiNSiVi) or 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasilazane ((ViSiN)4) in the presence of Karstedt’s catalyst. When the reactions were carried out in solvent-free conditions non-porous polysiloxane-silazane networks were obtained. The processes conducted in high internal phase emulsion (HIPE) resulted in macroporous materials. Their non-porous or porous morphology was established by SEM studies. They were also analyzed by elemental analysis, swelling measurements, FTIR and 29Si MAS-NMR spectroscopies and thermogravimetry coupled with mass spectrometry (TG/MS). Results showed that the non-porous networks contained high amounts of silazane moieties and were fairly hydrolytically stable. In contrast, contents of silazane units in most porous materials were low. Moreover, hydrolysis of Sisingle bondH groups of PHMS followed by condensation of the resulting Sisingle bondOH groups took place in HIPE conditions. This led to additional cross-linking of PHMS by siloxane bonds. During preparation of porous systems using ViSiNSiVi, hydrolysis of silazane bonds (Sisingle bondN) also occurred. All the materials studied in the work contained reactive Sisingle bondH groups and therefore exhibit a great potential for various applications. Presence of nitrogen atoms in their structure as well as porosity may be additional advantages.

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