Thermooxidative aging of rubber composites based on NR and NBR with incorporated strontium ferrite

Abstract

Rubber magnetic composites were prepared by incorporation of strontium ferrite in concentration scale ranging from 0 phr to 100 phr into rubber matrices based on natural rubber (NR) and acrylonitrile-butadiene rubber (NBR). The composite systems were exposed to the conditions of thermooxidative aging at 70°C for 7, 14, and 28 days. The influence of aging period on the behavior of prepared materials was considered based on investigation of their cross-link density, physical–mechanical, and magnetic characteristics. The results revealed that the influence of thermooxidative aging on composite characteristics is dependent on the type of rubber matrix. The thermooxidative aging was found to have negative effect on the cross-link density and tensile properties of composites based on NR, which were deteriorated in dependence of aging time. The possible influence of magnetic filler content on aging mechanism was observed during last period of aging after which the decrease in cross-link density and tensile characteristics was more pronounced with increasing content of strontium ferrite. By contrast, the cross-link density, modulus, and hardness of composites based on NBR were found to be positively influenced by aging as their values showed increasing trend with extension of aging period.

Keywords

Rubber magnetic composites strontium ferrite cross-link density magnetic characteristics thermooxidative aging

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References

Kramarenko

Chertovich

Stepanov

. Magnetic and viscoelastic response of elastomers with hard magnetic filler. Smart Mater Struct 2015; 24: 11.

Mietta

Tamborenea

Martin Negri

. Anisotropic reversible piezoresistivity in magnetic-metallic/polymer structured elastomeric composites: modelling and experiments. Soft Matter 2016; 12(2): 422–431.

Bellucci

de Almeida

FCL

Nobre

MAL

. Magnetic properties of vulcanized natural rubber nanocomposites as a function of the concentration, size and shape of the magnetic fillers. Compos B 2016; 85: 196–206.

Das

Nayak

Sahu

. Microwave absorption properties of double-layer composites using CoZn/NiZn/MnZn-ferrite and titanium dioxide. J Magn Magn Mater 2015; 377: 111–116.

Yadhu

Shine

Nazeeha

. Processability, mechanical and magnetic studies on natural rubber–ferrite composites. Int J Chem Stud 2015; 3(1): 15–22.

Pullar

. Hexagonal ferrites: a review of the synthesis, properties and applications of hexaferrite ceramics. Prog Mater Sci 2012; 57(7): 1191–1334.

Zhang

Shao

. Synthesis and properties of new multifunctional hexaferrite powders. Procedia Eng 2015; 102: 1885–1889.

Ezzati

Rabbani

Leblanc

. Conducting, magnetic polyaniline/Ba_0.25Sr_0.75Fe₁₁(Ni_0.5Mn_0.5)O₁₉ nanocomposite: fabrication, characterization and application. J Alloys Compd 2015; 646: 1157–1164.

Paul

. Magnetic and structural properties of Ba M-type ferrite-composite powders. Phys B 2007; 388: 337–343.

10.

Lechevallier

LeBreton

. Substitution effects in M-type hexaferrite powders investigated by Mössbauer spectrometry. J Magn Magn Mater 2005; 290–291: 1237–1239.

11.

Valenzuela

. Novel applications of ferrites. Phys Res Int 2012; 591839: 9.

12.

Pereira

FMM

Sombra

ASB

. A review on Ba_xSr_1−xFe₁₂O₁₉ hexagonal ferrites for use in electronic devices. Solid State Phenom 2013; 202: 1–64.

13.

Kyselá

Hudec

Alexy

. Manufacturing and processing of rubber. 1st ed. Bratislava: Slovak University of Technology Press, 2010.

14.

Kraus

. Swelling of filler-reinforced vulcanizates. J Appl Polym Sci 1963; 7: 861–871.

15.

Stephen

Jose

Joseph

. Thermal stability and ageing properties of sulphur and gamma radiation vulcanized natural rubber (NR) and carboxylated styrene butadiene rubber (XSBR) lattices and their blends. Polym Degrad Stab 2006; 91(8): 1717–1725.

16.

Rohana Yahya

Azura

Ahmad

. Effect of curing systems on thermal degradation behaviour of natural rubber (SMR CV 60). J Phys Sci 2011; 22(2): 1–14.

17.

Kruželák

Hudec

Dosoudil

. Influence of thermo-oxidative and ozone ageing on the properties of elastomeric magnetic composites. Polym Degrad Stab 2012; 97(6): 921–928.

18.

Komethi

Othman

Ismail

. Comparative study on natural antioxidant as an aging retardant for natural rubber vulcanizates. J Appl Polym Sci 2012; 124(2): 1490–1500.

19.

Zheng

Liu

Zhao

. Effects of lanthanum complex on the thermo-oxidative aging of natural rubber. Polym Degrad Stab 2015; 120: 377–383.

20.

Čulin

Gembarovski

Andreis

. Effect of thermal oxidative ageing on the morphology of natural rubber networks as viewed by ESR. Polym Int 2000; 49(8): 845–852.

21.

Pimolsiriphol

Saeoui

Sirisinha

. Relationship among thermal ageing degradation, dynamic properties, cure systems, and antioxidants in natural rubber vulcanisates. Polym Plast Technol Eng 2007; 46(2): 113–121.

22.

Kruželák

Hudec

Dosoudil

. Elastomeric magnetic composites—physical properties and network structure. Polimery 2012; 57(1): 27–32.

23.

Gijsman

. Review on the thermo-oxidative degradation of polymers during processing and in service. E-Polymers 2008; 8(1): 727–760.

24.

Kruželák

Ušaková

Dosoudil

. Microstructure and performance of natural rubber based magnetic composites. Polym Plast Technol Eng 2014; 53: 1095–1104.

25.

Kruželák

Sýkora

Dosoudil

. Rubber composites based on polar elastomers with incorporated modified and unmodified magnetic filler. Adv Mater Sci Eng 2016; article ID 7242891, 10.

26.

Marchi

Casu

Bertora

. Highly magneto-responsive elastomeric films created by a two-step fabrication process. ACS Appl Mater Interfaces 2015; 7(34): 19112–19118.