New oligomer-bound antioxidants for improved flex crack resistance and ozone resistance

Sulekha, P. B.; Joseph, Rani; Kurian, Thomas

doi:10.1016/s0141-3910(02)00090-3

Cited by 27 publications

(13 citation statements)

References 12 publications

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“…The distilled water aging 30 properties of S cured EPDM/SBR blends were investigated also and the water uptake at regular intervals of aging is shown in Table V. The water uptake of the blends in four stages after 7 d 14, 21, and 42 d were studied and it was found that the water uptake after 42 d was only 0.63% in the blend E 90 S (EPDM90/SBR10) and the values increased slightly with an increase in SBR content.…”

Section: Morphology Analysismentioning

confidence: 99%

Mechanical and aging properties of cross‐linked ethylene propylene diene rubber / styrene butadiene rubber blends

Nair

Kumaran

Unnikrishnan

2004

J of Applied Polymer Sci

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ABSTRACT:The mechanical properties and aging characteristics of blends of ethylene propylene diene monomer (EPDM) rubber and styrene butadiene rubber (SBR) were investigated with special reference to the effect of blend ratio and cross-linking systems. Among the blends, the one with 80/20 EPDM/SBR has been found to exhibit the highest tensile, tear, and abrasion properties at ambient temperature. The observed changes in the mechanical properties of the blends have been correlated with the phase morphology, as attested by scanning electron micrographs (SEMs). The effects of three different cure systems, namely, sulfur (S), dicumyl peroxide (DCP), and a mixed system consisting of sulfur and peroxide (mixed) on the blend properties also were studied. The stress-strain behavior, tensile strength, elongation at break, and tear strength of the blends were found to be better for the mixed system. The influence of fillers such as high-abrasion furnace (HAF) black, generalpurpose furnace (GPF) black, silica, and clay on the mechanical properties of 90/10 EPDM/SBR blend was examined. The ozone and water aging studies also were conducted on the sulfur cured blends, to supplement the results from the mechanical properties investigation.

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Section: Morphology Analysismentioning

confidence: 99%

Mechanical and aging properties of cross‐linked ethylene propylene diene rubber / styrene butadiene rubber blends

Nair

Kumaran

Unnikrishnan

2004

J of Applied Polymer Sci

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“…The preparation and characterization of new oligomer‐bound antioxidants [polyisobutylene‐bound paraphenylene diamine (PIB‐PD) and chlorinated‐paraffin‐wax‐bound paraphenylene diamine (CPW‐PD)] with saturated backbones were reported in our earlier articles 14, 15. A brief description of the efficiency of these antioxidants in elastomer blends, in comparison with blends containing Accinox TQ (polymerized 1,2‐dihydro‐2,2,4‐trimethyl quinoline), was reported 16. In this study, we evaluated the efficiency of these antioxidants in elastomer blends, such as NR/SBR and NR/BR, by comparing their mechanical properties and ozone resistance with those of their counterparts containing a paraphenylene diamine (PD) conventional antioxidant, Vulkanox 4020 [ N ‐(1,3‐dimethyl butyl)‐ N ′‐phenyl‐ p ‐phenylenediamine].…”

Section: Introductionmentioning

confidence: 96%

“…14,15 A brief description of the efficiency of these antioxidants in elastomer blends, in comparison with blends containing Accinox TQ (polymerized 1,2-dihydro-2,2,4-trimethyl quinoline), was reported. 16 In this study, we evaluated the efficiency of these antioxidants in elastomer blends, such as NR/ SBR and NR/BR, by comparing their mechanical properties and ozone resistance with those of their counterparts containing a paraphenylene diamine (Gujarat, India). The compounding ingredients, zinc oxide, stearic acid, and carbon black (HAF; N 330) were commercial-grade.…”

Section: Introductionmentioning

confidence: 99%

New oligomer‐bound antioxidants in natural rubber/polybutadiene rubber and natural rubber/styrene–butadiene rubber blends

Sulekha

Joseph

Manjooran

2004

J of Applied Polymer Sci

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New paraphenylene diamine antioxidants were prepared. The efficiency and permanence of these oligomer-bound paraphenylene diamines were compared with those of conventional amine-type antioxidants in elastomer blends such as natural rubber/styrene-butadiene rubber and natural rubber/polybutadiene rubber. These oligomerbound antioxidants showed improved aging resistance and ozone resistance in comparison with the blends containing conventional antioxidants. The liquid oligomer-bound paraphenylene diamine could replace the plasticizer required for compounding.

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“…A series of cracks develop, over time, which are perpendicular to the applied stress. Further exposure of these cracked surfaces to ozone cause the crack to become wider and deeper until the rubber fails [3,4] .…”

Section: Introductionmentioning

confidence: 99%

Natural Weathering Test of Styrene Butadiene Rubber and Recycled Acrylonitrile Butadiene Rubber (SBR/NBRr) Blends

Noriman¹,

Ismail²,

Azura³

2010

Polymer-Plastics Technology and Engineering

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The effect of recycled acrylonitrile butadiene rubber (NBRr) content of SBR/NBRr blends on natural weathering was studied. Three different size of NBRr (S1; 117-334 mm, S2; 0.85-15.0 mm and S3; direct sheeted form) were used and the blends were exposed to natural weathering for 3 and 6 months. The results indicated that the SBR/NBRr blends with smallest size of NBRr (S1) show a better retention of tensile properties, which are able to withstand better weathering than coarser size (S2 and S3) of SBR/NBRr blends. The presence of hydroxyl, carbonyl and nitro group after exposure to natural weathering was detected in FTIR analysis, which related to the UV oxidation process of rubber blends. The scanning electron microscopy proved that the SBR/NBRr blends with smallest size of NBRr (S1) with higher content of NBRr, shows a better resistant to natural weathering.

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New oligomer-bound antioxidants for improved flex crack resistance and ozone resistance

Cited by 27 publications

References 12 publications

Mechanical and aging properties of cross‐linked ethylene propylene diene rubber / styrene butadiene rubber blends

Mechanical and aging properties of cross‐linked ethylene propylene diene rubber / styrene butadiene rubber blends

New oligomer‐bound antioxidants in natural rubber/polybutadiene rubber and natural rubber/styrene–butadiene rubber blends

Natural Weathering Test of Styrene Butadiene Rubber and Recycled Acrylonitrile Butadiene Rubber (SBR/NBRr) Blends

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