Effects of fillers, maleated ethylene propylene diene diene rubber, and maleated ethylene octene copolymer on phase morphology and oil resistance in natural rubber/nitrile rubber blends

Abstract

ABSTRACT:The phase morphology and oil resistance of 20/80 NR/NBR blends filled with different types of fillers and copolymers were investigated. In the case of filler effect, N220, N330, and N660 carbon blacks with different particle sizes were used. Additionally, the blends filled with nonblack-reinforcing fillers, that is, precipitated and silanetreated silica, were investigated. To study the compatibilization effect, maleated ethylene propylene diene rubber (EPDM-g-MA) and maleated ethylene octene copolymer (EOR-g-MA) were added to the blends. The results revealed that the addition of filler, either carbon black or silica, to the blend caused a drastic decrease in NR dispersed phase size. Carbon blacks with different particle sizes did not produce any significant difference in NR dispersed phase size under the optical microscope. Silica-filled blends showed lower resistance to oil than did the carbon black-filled blends. In addition, it was determined that neither EOR-g-MA nor EPDM-g-MA could act as a compatibilizer for the blend system studied. The oil resistance of the blends with EPDMg-MA is strongly affected by the overall polarity of the blend. In the case of EOR-g-MA, the oil resistance of the blends is significantly governed by both overall polarity of the blend and phase morphology.

Enhanced oil resistance and mechanical properties of nitrile butadiene rubber/lignin composites modified by epoxy resin

“…As we know, there are two main factors responsible for the result of oil resistance in filled blends, crosslink density, and phase morphology. 42 On the one hand, it is logical that the vulcanizates has been converted to less penetrable materials by the oil if it has a higher crosslink density. That is to say, as shown in Figure 8.…”

“…It is obvious that NBR/50lignin/F51 composites have a better anti‐swelling property compared with NBR/50lignin, and the anti‐swelling property of NBR/50lignin/F51 composites increase with the loading of F51. As we know, there are two main factors responsible for the result of oil resistance in filled blends, crosslink density, and phase morphology . On the one hand, it is logical that the vulcanizates has been converted to less penetrable materials by the oil if it has a higher crosslink density.…”

Effect of Silica on Uncompatibilized and Compatibilized Styrene Butadiene Rubber and Nitrile Rubber Blends

“…The addition of fillers to blends results in an improvement in processing characteristics, improvement in technological properties, and better economics but this is controlled by the distribution of filler among the blend components. Fillers are considered to improve the phase morphology reducing the zone size of the incompatible blends [14]. According to Zhang et al [15], the thermodynamic compatibility of several binary blends are further improved by certain inorganic fillers.…”

Mechanical properties of vulcanizates of NR/NBR blends swelled by motor oil

“…Odpornooeae tak¹ nada-j¹ kauczukowi nitrylowemu grupy polarne wówczas, gdy zawartooeae merów akrylonitrylu przekracza 25 % mas. Obecnooeae tych grup w NBR czyni jednak ten kauczuk silnie niekompatybilnym z niepolarnym kauczukiem naturalnym; powoduje to znaczn¹ niejednorodnooeae uk³adu, zasadniczo wp³ywaj¹c¹ na ostateczn¹ charakterystykê wulkanizatów NR/NBR [1][2][3][4][5].…”

“…Woeród wielu czynników maj¹cych wp³yw na w³aoeciwooeci u¿ytkowe wulkanizatów mieszanin elastomerów nale¿y wymieniae przede wszystkim: wzajemny ich ilooeciowy stosunek w mieszaninie [2], ich lepkooeae i podobieñstwo chemiczne [6][7][8][9], typ i zawartooeae nape³niacza [4,7,10], rodzaj zespo³u sieciuj¹cego [2,6], zastosowane kompatybilizatory [3][4][5] oraz sposób sporz¹dzania mieszanki [10].…”