Effect of novolac nanoparticles additions on specific gravity of NBR/CR blends

Al-Maamori, Mohammed H.; Al-Mosawi, Ali I.; Abdulsada, Shaymaa Abbas

doi:10.1051/matecconf/201817804001

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…The purpose of blending two or several elastomer types is to improve processing and mechanical properties and reduce the compounding cost. Blending of elastomers can be practically carried out in several different ways, for example, latex, solution blending and mixing of solid rubbers on mills, in internal mixers or during continuous mixing [20].…”

Section: Introductionmentioning

confidence: 99%

“…The cross-linking of CR/BR/ Cu 2 O or CR/BR/CuO blends follows a cationic mechanism, using Lewis acid, copper(I) chloride (CuCl) or copper(II) chloride (CuCl 2 ) which is in situ generated [22]. It is worth noting that the performance of elastomeric blends depends on the ability of all components miscibility with each other, because blends with good miscibility and phase adhesion exhibit better performance than those weakly blended [20].…”

Section: Introductionmentioning

confidence: 99%

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The role of iron(III) oxide in chloroprene and butadiene rubber blends’ cross-linking, structure, thermal and mechanical characteristics

2019

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The role of iron(III) oxide (Fe 2 O 3) in the cross-linking process, structure and functional properties of chloroprene and butadiene rubber (CR/BR) blends was studied. The unconventional elastomeric blends containing chloroprene and butadiene rubbers of different mass ratios, cross-linked with iron(III) oxide, have been studied. It has found that the iron(III) oxide could be used as a cross-linking agent in CR/BR blend and the curing degree depends largely on the composition of the blends. These results indicate that the curing degree of the blends is increased with increasing amount of chloroprene rubber. It is very interesting to note that the addition of butadiene rubber to chloroprene rubber improved the mechanical properties of the resulting vulcanizates. The resulting CR/BR/Fe 2 O 3 vulcanizates were characterized by good mechanical properties. Surprisingly, the selected vulcanizates containing chloroprene and butadiene rubbers had a 40% greater tensile strength compared to vulcanizates containing only chloroprene rubber. The amount of iron(III) oxide as the curing agent slightly affected the curing degree and mechanical properties of the resulting rubber materials. This should probably be linked to the interelastomer reaction between the chloroprene and butadiene rubbers occurring in the presence of iron(III) oxide at an elevated temperature. Interelastomer reactions between both elastomers may lead to improved homogeneity and miscibility of the test systems. Additionally, it has been found that the CR/BR blends cross-linked with Fe 2 O 3 were characterized by a high flame resistance. The undoubtable advantages of the proposed technology are its simplicity, low cost and incombustibility.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The role of iron(III) oxide in chloroprene and butadiene rubber blends’ cross-linking, structure, thermal and mechanical characteristics

2019

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“…6 There has been a long-standing technical and commercial interest to synergistically combine the critical traits of CR and NBR, particularly the improved aging and weatherability from the CR side and high oil resistance from NBR. While some of the attributes of both the elastomers can be transferred into their physical amalgams, the resultant immiscible blends demonstrate challenges with reduced resilience, limited flex cracking, and ozone resistance, particularly with an increasing proportion of NBR in the composition, 7,8 With the technical intent to produce a copolymer of chloroprene that incorporates small proportions of unsaturated acrylonitrile monomers (under 20 wt.%) to augment the oil resistance while maintaining most of its inherent attributes of CR, a new rubber was designed and developed. The random copolymer of chloroprene and acrylonitrile, referred to as acrylonitrile-chloroprene rubber or NCR, was synthesized through a proprietary emulsion polymerization process at a temperature between 5 C and 20 C. 9 NCR, an amorphous rubber, is completely soluble in aromatic hydrocarbons such as toluene and chlorinated solvents such as methylene chloride in its pre-crosslinked state.…”

Section: Introductionmentioning

confidence: 99%

Influence of different curing regimes on properties of new copolymer of chloroprene and acrylonitrile

Sarkar

Sunada

Kondo

2021

Journal of Elastomers & Plastics

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The curing system plays a vital role in designing rubber compounds for various industrial applications. Therefore, it is paramount to establish viable curing strategies for any new elastomer to explore its application potentials and commercial significance. Impacts of different curing regimes on the properties of a recently developed copolymer of chloroprene and acrylonitrile (acrylonitrile-chloroprene rubber, NCR) are reported here. Several primary accelerators (four from thiourea- and one from thiazolene product families) were used for curing the new rubber along with fixed loadings of zinc oxide (5 phr) and magnesium oxide (4 phr). Besides, curatives based on sulfur and peroxide were also evaluated. The influence of different curing systems on the rheological and physical properties of the copolymer was explored. It has been seen that the properties of the copolymer are considerably influenced by the different curing systems used. While ethylene thiourea (ETU) and propylene thiourea (PTU), as primary accelerators, provide the highest state of cure but may cause scorch. The use of trimethyl thiourea (TMU), on the other hand, results in the fastest rate and the most stable state of cure, good scorch safety, bin stability, and an overall good balance of properties. The sulfur-based crosslinking system induces good mechanical properties but causes limited bin stability, poor high-temperature compression set, and impaired heat resistance properties. As a curing agent, peroxide delivers the best bin stability in the rubber stocks but yields higher stiffness and limited aging resistance in the vulcanizates.

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Introduction to the New Copolymer of Chloroprene and Acrylonitrile with Differentiated Properties

Sarkar

Nishino

Ishigaki

et al. 2021

Advances in Polymer Technology

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The random copolymer of chloroprene and acrylonitrile is a newly developed rubber whose features and value propositions are not scientifically explored yet. This article focuses on the basic characterizations and properties of acrylonitrile-chloroprene rubber. Qualitative analyses through infrared (FTIR) and nuclear magnetic resonance (1H-NMR) spectra confirm the presence of both the -Cl and -CN groups in the new rubber. As evidenced through differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA), the single glass transition temperature of acrylonitrile-chloroprene rubber reflects its monophasic random microstructure. While compared against commercial grades of chloroprene rubber (CR) and nitrile rubber (NBR), the new rubber provides a distinctive combination of properties that are not available with either of the elastomer alone. Acrylonitrile-chloroprene rubber demonstrates slightly lower specific gravity, an improved low-temperature compression set, higher flex-fatigue resistance, and lower volume swelling in IRM 903 and Fuel C to chloroprene rubber. As compared to nitrile rubber, the new copolymer shows appreciably better heat aging and ozone resistance. Good abrasion resistance, low heat buildup, and remarkably high flex-fatigue resistance indicate excellent durability of the acrylonitrile-chloroprene rubber under dynamic loading. Based on the preliminary results, it is apparent that the new copolymer can be a candidate elastomer for various industrial applications which demand good fluid resistance, high heat and low-temperature tolerances, good weatherability, and durability under static and dynamic conditions.

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Effect of novolac nanoparticles additions on specific gravity of NBR/CR blends

Cited by 3 publications

References 13 publications

The role of iron(III) oxide in chloroprene and butadiene rubber blends’ cross-linking, structure, thermal and mechanical characteristics

The role of iron(III) oxide in chloroprene and butadiene rubber blends’ cross-linking, structure, thermal and mechanical characteristics

Influence of different curing regimes on properties of new copolymer of chloroprene and acrylonitrile

Introduction to the New Copolymer of Chloroprene and Acrylonitrile with Differentiated Properties

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