Disulfides - Effective radical generators for flame retardancy of polypropylene

Weronika Pawelec, Anton Holappa, Teija Tirri, Melanie Aubert, Holger Hoppe, Rudolf Pfaendner, Carl-Eric Wilen

    Tutkimustuotos: LehtiartikkeliArtikkeliTieteellinenvertaisarvioitu

    39 Sitaatiot (Scopus)

    Abstrakti

    The potential of thirteen aliphatic, aromatic, thiuram and heterocyclic substituted organic disulfide derivatives of the general formula R–S–S–R′ as a new group of halogen-free flame retardants (FR) for polypropylene films have been investigated. According to DIN 4102-1 standard ignitibility test, for the first time it has been demonstrated that many of the disulfides alone can effectively provide flame retardancy and self-extinguishing properties to polypropylene (PP) films at already very low concentrations of 0.5 wt%. In an effort to elucidate the mechanism of the thermal decomposition of disulfide derivatives the fragmentation patterns of the evolved gases from a thermogravimetric analyzer (TGA) have been analyzed by simultaneous mass spectrometry (MS) and Fourier transform infrared spectrometry (FTIR). The main decomposition products initiated by homolytic scission of the S–S bond and/or scission of the C–S bond were identified as thiols, aliphatic and aromatic hydrocarbons, isothiocyanates (depending on the disulfide structures) with further evolution of elemental sulfur and sulfur dioxide at temperatures of above 300 °C and 450 °C, respectively. Based on this preliminary study, we have shown that disulfides represented by e.g. diphenyl disulfide (1), 5,5′-dithiobis(2-nitrobenzoic acid) (2), bis(1-phenyl-1H-tetrazol-5yl)-disulfide (4), 2-bisbenzothiazole-2,2′-disulfide (6) and N,N-dithiobis-(phtalimide) (10) constitute a new halogen-free family of additives for flame retarding of polypropylene.
    AlkuperäiskieliEnglanti
    Sivut447-456
    JulkaisuPolymer Degradation and Stability
    Vuosikerta110
    DOI - pysyväislinkit
    TilaJulkaistu - jouluk. 2014
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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