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Reactivity of the tin homolog of POSS, butylstannoxane dodecamer, in oxygen-induced crosslinking reactions with an organic polymer matrix: study of long-time behavior
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SYSNO ASEP 0444156 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Reactivity of the tin homolog of POSS, butylstannoxane dodecamer, in oxygen-induced crosslinking reactions with an organic polymer matrix: study of long-time behavior Author(s) Rodzen, Krzysztof (UMCH-V)
Strachota, Adam (UMCH-V) RID, ORCID
Ribot, F. (FR)
Matějka, Libor (UMCH-V) RID
Kovářová, Jana (UMCH-V) RID
Trchová, Miroslava (UMCH-V) RID, ORCID
Šlouf, Miroslav (UMCH-V) RID, ORCIDSource Title Polymer Degradation and Stability. - : Elsevier - ISSN 0141-3910
Roč. 118, August (2015), s. 147-166Number of pages 20 s. Language eng - English Country NL - Netherlands Keywords POSS ; stannoxane ; reactivity Subject RIV CD - Macromolecular Chemistry R&D Projects GAP108/11/2151 GA ČR - Czech Science Foundation (CSF) Institutional support UMCH-V - RVO:61389013 UT WOS 000357243500017 EID SCOPUS 84930641837 DOI 10.1016/j.polymdegradstab.2015.04.020 Annotation The chemical activity of the heavier POSS homolog, n-butylstannoxane dodecamer cage, in an epoxy matrix containing polopropylene oxide (PPO) chains was studied in detail, especially the long-time development of the effect and its limits in time at different concentrations. A multi-method investigation was carried out, employing spectrometric analysis of chemical composition (NMR, IR), TEM, thermogravimetry, weight loss analysis during isothermal oxidation at 180 °C, as well as dynamic-mechanical thermal analysis (DMTA) of intact and of oxidized epoxy/stannoxane hybrids. The PPO segments of the matrix were found to be preferentially degraded by oxidation or by anaerobic pyrolysis, while at the same time these segments are the sites of crosslinking reactions with stannoxane, which counteract matrix degradation. It was demonstrated, that the cages undergo repeated reactions on the Sn atoms, and remain finely dispersed and well-accessible even after long oxidation times. The repeated reactions also explain the observed very strong stabilizing effect of stannoxane at very low concentrations. Efficient stabilization against the degradation of the mechanical properties was found to require higher – but still very low – concentrations, than the stabilization against weight loss. Interestingly, certain amounts of stannoxane caused simultaneously enhanced weight losses and a mechanical reinforcement due to a higher amount of radical reactions. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2016
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