Influence of silane coupling agents on vulcanised natural rubber: Dynamic properties and heat buildup

Abstract

We explore the influence of surface modification of SiO₂ on dynamic properties and heat buildup of semi-efﬁcient vulcanisates filled by both SiO₂ and carbon black. Compared with untreated-SiO₂-filled natural rubber (NR), vulcanisates reinforced by modified-SiO₂ presents not only better filler dispersity, mechanical properties and dynamic properties, as confirmed by scanning electron microscope and rubber processing analyser, but also lower heat buildup. Fourier infrared spectroscopy and cure characteristics indicates that silane coupling agent molecules grafted on the silica surface provoke an enhanced mobility of rubber chain and adsorb onto filler surface and then decrease the barrier of crosslink reaction. Moreover, composites with Si69-modified-SiO₂ show obviously the highest tear strength and lowest heat buildup attributed to that more sulphur released by Si69 also participate the vulcanisation reaction.

Keywords

Silane coupling agent Payne effect Mechanical properties Aging resistance Microtopography Dynamic properties Heat buildup

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