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J. Pełka, В. Szabłowska

Organosilanes as crosslinking agents for plasticized PVC compositions

Polimery 1996, No 11-12, 647

DOI: dx.doi.org/10.14314/polimery.1996.647


Plasticized PVC was crosslinked by alkoxysilanes GF-91, A-1120 and A-1110 and by mercaptoalkoxysilanes GF-70 and A-189. Aminoalkoxysilanes made the PVC crosslink and degrade prematurely under the experimental conditions. Therefore, mercaptosilanes and mercapto/aminosilanes mixtures were used for the actual experiments. Mechanical properties and thermal stability were examined for the organosilane-crosslinked diisodecyl phthalate (FDID)- and trioctyl trimellitate (TOTM)-plasticized PVC in relation to organosilane and filler (chalk, kaolin) proportions. At elevated temperatures (hot-set tests) the crosslinked PVCs were more resistant to deformations and had better mechanical properties though somewhat lower thermal stability than the uncrosslinked PVCs. Mercaptoalkoxysilane produced no premature crosslinking under the conditions used. Chalk proved to be the more advantageous filler, kaolin requiring more of the crosslinking silane to be used.

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