Effect of unsaturated polyester resin on the mechanical and ultrasonic properties of SBR and NBR

Youssef, Moheb H.; Mansour, S. H.; Tawfik, S. Y.

doi:10.1016/s0032-3861(00)00115-4

Cited by 15 publications

(8 citation statements)

References 14 publications

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“…In pure NBR specimens, V and ␣ remained unchanged with addition of UPE. The same observation was obvious in a recent work 16 in which the main attenuation relaxation peak in SBR, corresponding to the glass transition, shifted to higher temperatures with addition of 5 phr UPE, whereas the shift in the same peak for NBR was very slight. The least square linear fittings are also shown in Figures 2 and 3 as solid lines.…”

Section: Resultssupporting

confidence: 82%

“…The materials used to prepare the samples investigated in this work are (i) styrene-butadiene rubber (SBR 1502; styrene content, ϳ23.5%) with specific gravity of 0.945 Ϯ 0.005 and Mooney viscosity (ML4) of ϳ52 at 100°C; (ii) acrylonitrilebutadiene rubber (NBR; Krynac 34-52; acrylonitrile content, ϳ33%), with specific gravity of 0.990 Ϯ 0.005 and Mooney viscosity (ML4) of ϳ45 at 100°C; and (iii) the unsaturated polyester resin (UPE) is based on the reaction of p-carbethoxy phthalinilic acid, maleic anhydride, and ethylene glycol with acid value 7.7 mg KOH/g was prepared in a previous work by the authors; 16 and (iv) dicumyl peroxide [bis(1-methyl-1-phenylethyl) peroxide] was obtained from Aldrich Company.…”

Section: Experimental Materials and Blend Preparationmentioning

confidence: 99%

“…8 -11 The effect of the polyester resins on the properties of many kinds of rubber has been extensively studied. [12][13][14][15][16] The main aim of this work is to study the effect of unsaturated polyester resin (UPE) on the properties and the compatibility of styrene-butadiene (SBR) and acrylonitrile-butadiene (NBR) rubber blends.…”

Section: Introductionmentioning

confidence: 99%

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Unsaturated polyester as compatibilizer for styrene–butadiene (SBR)/acrylonitrile–butadiene (NBR) rubber blends

Mansour

Tawfik

Youssef

2002

J of Applied Polymer Sci

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ABSTRACT:The effect of the addition of 5 and 10 phr of unsaturated polyester resin (UPE) on the compatibility and physicomechanical properties of styrene-butadiene (SBR) and acrylonitrile-butadiene (NBR) rubber blends was studied. Differential scanning calorimetry (DSC), scanning electron microscopy (SEM), electrical, and ultrasonic techniques were used to determine the degree of the compatibility (DC). The results obtained revealed that, by the addition of 10 parts per hundred parts of rubber (phr) UPE as a compatibilizer for SBR/NBR blends, the degree of compatibility was greatly enhanced. The rheological and mechanical properties of the blends were also improved.

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Section: Resultssupporting

confidence: 82%

Section: Experimental Materials and Blend Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Unsaturated polyester as compatibilizer for styrene–butadiene (SBR)/acrylonitrile–butadiene (NBR) rubber blends

Mansour

Tawfik

Youssef

2002

J of Applied Polymer Sci

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“…The relaxation processes of styrene-butadiene rubber (SBR) and acrylonitrile-butadiene rubber (NBR) modified with 5 phr UPR were studied using the ultrasonic technique at 2 and 5 MHz in a range between 180 and 346 K [148]. Measurements of the ultrasonic velocity and attenuation, made at higher frequencies because of the extremely high ultrasonic absorption, showed a main relaxation peak and a secondary one due to the small-scale segmental motion of butadiene.…”

Section: Other Methodsmentioning

confidence: 99%

Unsaturated Polyester Resins: Chemistry and Technology

Penczek

Czub

Pielichowski

2005

Advances in Polymer Science

104

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“…Liquid polyethers such as poly(propylene oxide) [60] as well as hydroxylterminated polybutadiene (HTPB) [61,62], styrene-butadiene rubber (SBR), and acrylonitrile-butadiene rubber (NBR) [63] have also been used as toughening agents for different type of thermosets.…”

Section: Liquid-toughening Rubber In Thermoset Resinsmentioning

confidence: 99%

Liquid Rubbers as Toughening Agents

Kargarzadeh

Ahmad

Abdullah

2014

Micro‐ and Nanostructured Epoxy/Rubber Blends

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IntroductionToughness, the resistance of the materials to crack propagation, is one of the most important properties for materials intended for load-bearing applications. Thermoset materials such as epoxy and unsaturated polyester resins need to be modified with elastomeric materials to improve their properties. Blending thermosets resin with liquid rubber leads to a randomly dispersed rubber phase in the material and creates high dissipation energy for impact failures. Our focus is to discuss the use of liquid rubber from NR as a toughening agent in thermosets resin. The major advantage of natural rubber, which makes it dominant in many engineering applications, is its dynamic performance. NR has also properties which are attractive for toughening purposes such as low glass-transition temperature (T g ), high molecular weight, and high tear. Toughening of Thermoset ResinsMost of the thermoset resins developed over the past decade have been largely used as matrices in fiber-reinforced composites for aerospace industries. These resins are capable of withstanding elevated temperature applications via increasing rigidity and/or cross-link density of their networks. However, in almost every case, the same network that provides the high-temperature properties also inhibits molecular flow, thus rendering the material low in toughness [1,2]. Thus, it is necessary to enhance their fracture properties without sacrificing other mechanical properties.The commonly known approaches for toughening brittle thermosets include chemical modification of a given rigid thermoset backbone to a more flexible backbone structure, increasing thermoset molecular weight, lowering the crosslink density of the cured resin via use of low-functionality curing agents, and

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Effect of unsaturated polyester resin on the mechanical and ultrasonic properties of SBR and NBR

Cited by 15 publications

References 14 publications

Unsaturated polyester as compatibilizer for styrene–butadiene (SBR)/acrylonitrile–butadiene (NBR) rubber blends

Unsaturated polyester as compatibilizer for styrene–butadiene (SBR)/acrylonitrile–butadiene (NBR) rubber blends

Unsaturated Polyester Resins: Chemistry and Technology

Liquid Rubbers as Toughening Agents

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