Changes in morphology and properties of NR–NBR blends. Effect of viscosity ratio modified by liquid natural rubber and epoxidised liquid natural rubber

Sirisinha, Chakrit; Baulek-Limcharoen, S.; Thunyarittikorn, Jarunee

doi:10.1179/146580101322913400

Cited by 16 publications

(14 citation statements)

References 10 publications

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“…In addition, the thermal stability of NR is fairly poor due to its highly unsaturated structure. To overcome such shortcomings, many attempts have been made by blending NR with synthetic rubbers such as chlorosulfonated polyethylene (CSM), acrylate rubber (ACM), nitrile rubber (NBR), and chloroprene rubber (CR) [1][2][3][4][5][6][7]. It is widely known that there are many factors governing the blend properties including blend ratio and blend morphology [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Properties of Natural Rubber Filled with Ultra Fine Acrylate Rubber Powder

Sae‐Oui

Sirisinha

Hatthapanit

2010

Journal of Elastomers & Plastics

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Properties of natural rubber (NR) filled with various loadings of ultra-fine vulcanized acrylate rubber powder (ACMP) were investigated. ACMP loading was varied from 0 to 20 phr and, after compounding, the compound properties were determined. Results reveal that increasing ACMP loading leads to improved processability, as evidenced by the reduction of both mixing energy and Mooney viscosity. ACMP, however, has negative effect on cure, that is, both scorch time and optimum cure time are prolonged while the state of cure is reduced with increasing ACMP loading. Due to the reinforcing effect of the fine ACMP particles, both modulus and hardness are found to increase consecutively with increasing ACMP loading. The tensile strength is also found to improve with increasing ACMP loading up to 10 phr. However, due to the cure retardation effect and the high thermoplastic nature, the presence of ACMP causes deterioration of elasticity. As ACMP is highly polar and fully saturated, the addition of ACMP enhances the resistance to oil and thermal aging of the

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Section: Introductionmentioning

confidence: 99%

Properties of Natural Rubber Filled with Ultra Fine Acrylate Rubber Powder

Sae‐Oui

Sirisinha

Hatthapanit

2010

Journal of Elastomers & Plastics

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“…The cure characteristics, e.g., scorch time ( t s 2) and optimum cure time ( t c 90) including minimum torque (ML) and maximum torque (MH), were investigated using a moving die rheometer (TechPro MD+) at 150°C following ISO 6502. It was reported earlier that the torque difference (MH – ML) is directly proportional to the degree of crosslinking; therefore, it is used here to indirectly represent the crosslink density of the blend vulcanizates 15, 16…”

Section: Methodsmentioning

confidence: 99%

Possible use of ultra‐fine acrylonitrile butadiene rubber powder as filler in natural rubber vulcanizates

Sae‐Oui

Sirisinha

Thaptong

et al. 2010

J of Applied Polymer Sci

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Possible use of ultra-fine acrylonitrile butadiene rubber powder (UFNBRP) as a filler for natural rubber (NR) was investigated. The UFNBRP was added into NR at various concentrations, and the compound properties were determined. It is found that, with increasing UFNBRP loading, the compound viscosity is increased, whereas both scorch time and optimum curing time are significantly reduced. The results also reveal that UFNBRP has negative effect not only on crosslink density but also on most mechanical properties of the vulcanizate, such as tensile strength, tear strength, compression set, and abrasion resistance. The deterioration of these mechanical properties is thought to arise mainly from the combined effect of large phase size of the dispersed UFNBRP and low interfacial adhesion taking place from the polarity difference between UFNBRP and NR. Interestingly, it is found that, after aging, UFNBRP could promote postcuring phenomenon leading to increases of both relative 100% modulus and relative tensile strength. Oil resistance is also found to improve considerably with increasing UFNBRP loading. This improvement is mainly attributed to the dilution effect, i.e., the higher the UFNBRP loading, the lower the NR portion and, thus, the greater the oil resistance of the vulcanizate.

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“…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].…”

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“…Wszystkie te czynniki kszta³tuj¹ morfologiê fazow¹ wulkanizatów, przy tym im wymiary domen fazy rozproszonej s¹ mniejsze, tym w³aoeciwooeci wytrzyma³ooeciowe wulkanizatu s¹ lepsze -zatem w przypadku NR/NBR wiêksza staje siê odpornooeae wulkanizatów na dzia³anie olejów [4,8,11,12]. Wymiary domen fazy rozproszonej zale¿¹ od zawartooeci poszczególnych kauczuków w mieszaninie, mianowicie gdy udzia³ sk³adnika tworz¹cego fazê rozproszon¹ znacznie siê zmniejsza, wymiary domen tej fazy te¿ ulegaj¹ zmniejszeniu.…”

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

Dębek¹,

Magryta²,

Dębek³

2006

Polimery

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W³aoeciwooeci mechaniczne wulkanizatów mieszanin NR/NBR spêcznionych olejem silnikowymStreszczenie -Zbadano wp³yw ilooeci sadzy i NBR w wulkanizatach NR/NBR (NBR -kauczuk butadienowo-akrylonitrylowy, NR -kauczuk naturalny) na ich w³aoeciwooeci mechaniczne i odpornooeae na dzia³anie pó³synetycznego oleju silnikowego. Zaobserwowany wp³yw sk³adu na te w³aoeciwooeci wulkanizatów zinterpretowano na podstawie badañ morfologii metod¹ SEM i oceny wzajemnych oddzia³ywañ pomiêdzy sk³adnikami uk³adu. S³owa kluczowe: wulkanizaty, mieszaniny NR/NBR, sadza, odpornooeae na dzia³anie oleju, w³aoeciwooeci mechaniczne, oddzia³ywania w uk³adach elastomer-nape³niacz. MECHANICAL PROPERTIES OF VULCANIZATES OF NR/NBR BLENDS SWELLED BY MOTOR OILSummary -The effects of carbon black amount (up to 70 phr) and NBR content in NR/NBR vulcanizates (NBR -nitrile-butadiene rubber, NR -natural rubber) on their mechanical properties and resistance to motor oil were investigated. As well the vulcanizates of individual rubbers were tested. All systems were characterized using vulcametric method (Table 1). As a result of equilibrium swelling of NR vulcanizates with oil, mechanical properties drastically deteriorated and this deterioration was directly proportional to the degree of oil absorption, lowering with carbon black content (Table 2). What concerns oil-extended NBR vulcanizates neither weight gain nor increase in volume of the samples were observed in the whole range of carbon black content. However, small changes in hardness and strength (more visible when vulcanizates contained smaller amounts of filler) show that limited oil absorption by NBR vulcanizates occurs (balanced with elution of the system components) (Table 3). Swelling degree of NR/NBR blends vulcanizates depend both on NBR and carbon black contents. Swelling degree of the systems containing 50 phr of NBR and up to 30 phr of carbon black reached still rather high values (Table 4). For vulcanizates containing 50-70 phr of carbon black it was four times lower than in case of NR samples with the same carbon black content while tensile strength decreased only 24 %. NR/NBR vulcanizates containing 75 phr of NBR and 30-70 phr of carbon black show good resistance to oil (Table 5). Mechanical properties of these vulcanizates after swelling are practically the same as before. The observed effect of vulcanizate composition on the properties tested was interpreted on the basis of morphology investigations by SEM method (Fig. 1 and 2).

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Changes in morphology and properties of NR–NBR blends. Effect of viscosity ratio modified by liquid natural rubber and epoxidised liquid natural rubber

Cited by 16 publications

References 10 publications

Properties of Natural Rubber Filled with Ultra Fine Acrylate Rubber Powder

Properties of Natural Rubber Filled with Ultra Fine Acrylate Rubber Powder

Possible use of ultra‐fine acrylonitrile butadiene rubber powder as filler in natural rubber vulcanizates

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

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