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Polyhedral oligomeric butyl stannoxane cages (Sn-POSS) as oxidation-activated linear repairing units or crosslinking nano-building blocks, depending on structure of the polymer matrix

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    SYSNO ASEP0475150
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevPolyhedral oligomeric butyl stannoxane cages (Sn-POSS) as oxidation-activated linear repairing units or crosslinking nano-building blocks, depending on structure of the polymer matrix
    Tvůrce(i) Rodzen, Krzysztof (UMCH-V)
    Strachota, Adam (UMCH-V) RID
    Raus, Vladimír (UMCH-V) RID
    Pavlova, Ewa (UMCH-V) RID
    Zdroj.dok.Polymer Degradation and Stability. - : Elsevier - ISSN 0141-3910
    Roč. 142, August (2017), s. 1-20
    Poč.str.20 s.
    Jazyk dok.eng - angličtina
    Země vyd.NL - Nizozemsko
    Klíč. slovaPOSS ; stannoxane ; nanocomposite
    Vědní obor RIVCF - Fyzikální chemie a teoretická chemie
    Obor OECDPhysical chemistry
    CEPGA17-05007S GA ČR - Grantová agentura ČR
    Institucionální podporaUMCH-V - RVO:61389013
    UT WOS000408183300001
    EID SCOPUS85020036460
    DOI10.1016/j.polymdegradstab.2017.05.019
    AnotaceThe chemically active heavier POSS homolog, the n-butylstannoxane dodacamer cage, shows unusual stabilizing properties during an oxidizing treatment of organic-inorganic hybrid polymer materials, into which it is incorporated as nano-building block. In this work, we dispersed Sn_POSS in several matrixes, which mainly had all-carbon backbones (based on polystyrene, polyacrylates and polyethers). Sn_POSS concentration was varied, and it was incorporated either as non-functional cage (blending), or via covalent bonding as a large co-monomer. The stannoxane cages' reactivity in the different matrixes was compared, and the authors propose matrix-dependent mechanisms of the stabilizing effect of Sn_POSS, which make possible to predict the behavior of this cage in different polymers, if their degradation mechanism and eventual reactivity of pendant groups can be estimated. Under oxidizing conditions, the studied matrixes yielded either pendant radicals on (at first) intact chains, or terminal radicals on ends of fragmented chains, depending on the exact polymer structure. The stannoxane cages, if present, subsequently underwent either crosslinking, or chain-repair reactions (fragmented chains re-connection) with the radical sites of the matrix. Another reaction type, which yielded additional crosslinking in the hybrids, was observed in case that the polymer matrix contained suitable pendant functional groups, which were able to react with Sn_POSS after activation either by heat or by oxidation.
    PracovištěÚstav makromolekulární chemie
    KontaktEva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
    Rok sběru2018
Počet záznamů: 1