Effects of silane coupling agents on mica‐filled styrene‐butadiene rubber

ABSTRACT:The rheometric, mechanical, and dynamic mechanical properties as well as fracture surfaces of natural rubber-mica and polybutadiene rubber-mica vulcanizates were studied. Mica was used in the range of 0 -30 phr and the rheometric study was carried out at 160°C. The results indicate that the mechanical properties are improved as filler addition increases. Dynamic mechanical testing was used to analyze the observed mechanical behavior. The two elastomers showed different fracture behaviors.

Section: Introductionmentioning

confidence: 99%

Effect of mica addition on the properties of natural rubber and polybutadiene rubber vulcanizates

Castro

Suarez

Nunes

et al. 2003

“…A mechanism4–8 of PBR–fly ash interaction resulting from the incorporation of Si‐69 into fly ash–filled PBR can be proposed in the following three steps. The unsaturated backbone of PBR, the interaction between PBR and fly ash through condensation of silane coupling agents (Si‐69), and surface hydroxyl groups of filler with silanol groups of coupling agent (Si‐69) are represented below.…”

Section: Resultsmentioning

confidence: 99%

Effect of coupling agent on the mechanical properties of fly ash–filled polybutadiene rubber

Alkadasi

Hundiwale

Kapadi

2003

Fly ash, a waste product of thermal power stations generated in huge quantities, has been posing problems of its disposal. As such it contains a variety of inorganic oxides and is available in finely powdered form. Attempts have been made for its use as a filler in elastomers and plastics. It is important to note that fly ash used in in untreated form does not significantly enhance the mechanical properties of composites. In this work, fly ash treated with silane coupling agent (Si-69) was used as a filler in polybutadiene rubber (PBR). The comparison of properties of composites filled with treated and untreated fly ash revealed that the composites with treated fly ash showed better reinforcing properties. Thus the silane coupling agent used here promoted adhesion between fly ash and the PBR. The improvement in mechanical properties in general and tensile properties (tensile strength, modulus 100% and modulus 200%, hardness) of the composites in particular were observed.

“…The silane coupling agent, which is itself a crosslinking agent, increases the crosslink density of the composites, thereby enhancing the modulus. 12 The modulus was found to increase by increasing the concentration of the coupling agent. For the CBS-accelerated composite the modulus increase was more pronounced with higher concentrations of ENR and the value obtained with 15 parts of ENR was even higher than that obtained for composites containing 8% Si-69.…”

Section: Modulusmentioning

confidence: 97%

Epoxidized natural rubber as a reinforcement modifier for silica‐filled nitrile rubber

George

Varkey

Kurian

et al. 2002

Hydrated silicas impart better physical properties to polar rubbers, compared to those of hydrocarbon rubbers. However, to achieve optimum properties silane coupling agents are crucial in such formulations. Epoxidized natural rubber (ENR) in small proportions is used as a reinforcement modifier for silica-filled nitrile rubber (NBR). Two systems of cure were used: N-cyclohexyl-2-benzthiazyl sulfenamide (CBS) alone and in combination with diphenyl guanidine (DPG). In the CBS accelerated system, incorporation of an optimum concentration of about 15% of ENR on total rubber was found to improve technological properties. Addition of a secondary accelerator further improves these properties. Comparable results are obtained with those containing coupling agent and NBR-ISAF. High bound rubber and volume fraction values indicate a high polymer-filler interaction and gel content resulting from the NBR-ENR interaction. Results of this study reveal that ENR could be used as a reinforcement modifier for the NBR-silica system.