Influence of 1,2‐polybutadiene on properties of dicumyl peroxide cured brominated butyl rubber

Xia, Yuan; Wang, Jin‐Yuan; Wang, Chunwei; Gao, Steven; Guo, Sharon; Zhang, Yong

doi:10.1002/app.43280

Cited by 17 publications

(11 citation statements)

References 19 publications

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“…Cross‐linking of elastomers with peroxides can be effectively improved by using coagents . Coagents are multifunctional low‐molecular‐weight organic molecules that are highly reactive toward free radicals.…”

Section: Introductionmentioning

confidence: 99%

“…12,[14][15][16] Cross-linking of elastomers with peroxides can be effectively improved by using coagents. [17][18][19][20] Coagents are multifunctional lowmolecular-weight organic molecules that are highly reactive toward free radicals. They are used not only to increase the cross-linking efficiency of the curing process but also to increase the cross-link density of final vulcanizates.…”

Section: Introductionmentioning

confidence: 99%

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Cross‐linking and properties of rubber magnetic composites cured with different curing systems

Kruželák

Chodák

Mošková

et al. 2017

Polymers for Advanced Techs

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Rubber magnetic composites were prepared by incorporation of strontium ferrite into rubber compounds based on acrylonitrile butadiene rubber and ethylene propylene diene monomer rubber. The sulfur, peroxide, and mixed sulfur/peroxide curing systems were introduced as cross-linking agents for rubber matrices. The aim was to investigate the influence of curing system composition on curing process and cross-link density of composite materials. Then, static and dynamic mechanical properties and thermal and magnetic characteristics were investigated in relation to the cross-link density of rubber magnetic composites and structure of the formed cross-links. The changes of dynamical and physicomechanical properties were in close correlation with the change of cross-link density, whereas the tensile strength of magnetic composites showed increasing trend with increasing amount of peroxide in mixed curing systems. On the other hand, thermal conductivity and magnetic characteristics were found not to be dependent on the curing system composition. Incorporation of magnetic crystalline ferrites into various rubber matrices leads to the preparation of magnets, known as ferrite rubber magnets. [5][6][7][8] Rubber magnetic composites are materials that consisted of at least 2 phases, magnetic powder as filler and continuous rubbermatrix. An advantage of these materials is the fact that they are possible to be prepared and processed by the technologies typically used for polymer composites processing. Rubber magnetic composites show excellent flexibility and easy workability, and moreover, they are characterized by good magnetic characteristics. They can be bent, coiled, and shaped without the loss of their magnetic characteristics. Additionally, they are very resistant to corrosion; therefore, no surface treatment is necessary.A lot of vulcanization systems have already been investigated as cross-linking agents for rubber formulations, among which sulfur and peroxide curing systems are still the most frequently used.Sulfur vulcanization is the oldest method used for cross-linking of unsaturated elastomers. It is a complex process that leads to the forming of different types of sulfide cross-links between macromolecules of rubber, namely, monosulfide C-S-C, disulfide C-S 2 -C, and polysulfide cross-links C-S x -C (x = 3-6). In general, sulfur-cured vulcanizates exhibit good tensile properties, high tensile and tear strength, and good elastic behavior, but weak high-temperature stability and poor resistance to aging. 9-13The application of peroxide curing system in cross-linking of elastomers leads to the forming of covalent carbon-carbon crosslinks between elastomer chain segments. C-C bonds have higher dissociation energy in comparison with sulfidic cross-links; therefore, peroxide-vulcanized elastomers exhibit higher thermal stability and good resistance to thermo-oxidative aging. Good electrical properties, low compression set, and no discoloration of the final products are next cognitive features of peroxide cured vulcaniz...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cross‐linking and properties of rubber magnetic composites cured with different curing systems

Kruželák

Chodák

Mošková

et al. 2017

Polymers for Advanced Techs

View full text Add to dashboard Cite

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“…Among the methacrylate coagents, trimethylopropane trimethacrylate (TMPTMA) showed the best overall balance of physico‐mechanical properties . Polymer with plentiful vinyl groups could also be used as crosslinking coagent, which had lower toxicity, odor and volatility than the conventional micromolecular coagents …”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of SBS and trimethylopropane trimethacrylate (TMPTMA) on dynamically vulcanized SEBS/PP blends

Shentu

Wang

2016

J of Applied Polymer Sci

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The SEBS/PP thermoplastic vulcanizates (TPVs) were prepared by melt blending. Di‐tert‐butyl peroxide (DTBP) was used as the curing agent in combination with trimethylopropane trimethacrylate (TMPTMA) and poly(styrene‐b‐butadiene‐bstyrene) (SBS) as the coagents for the curing process. The synergistic effect of TMPTMA and SBS on the structure and properties of TPVs was studied by means of FT‐IR, DSC, torque rheometer, and universal testing machine. Both SEBS and PP crosslinked and the network structure formed under the participation of TMPTMA and SBS. Compared with the sole addition of the coagent, simultaneous loading of both TMPTMA and SBS could provide the TPVs with better solvent‐resistance and excellent mechanical properties. The crosslinking mechanism of the TPVs was also proposed. The slight lower value of Tm for the TPVs indicated the improved miscibility between PP and SEBS due to the crosslinking reaction. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44392.

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“…HVBR presents several advantages, such as a low toxicity and odor and an olefinic nature, over common coagents. Thus, HVBR is used as an additive, processing aid, and coagent in various rubber curing processes, such as those of ethylene propylene diene terpolymer, cis ‐1,4‐PB rubber, and brominated butyl rubber . However, the effects of HVBR on the properties of peroxide‐cured FEPM and the crosslinking mechanism have not been reported.…”

Section: Introductionmentioning

confidence: 93%

Curing of a tetrafluoroethylene–propylene elastomer with high‐vinyl polybutadiene rubber and peroxide

Cong

Liu

Wei

et al. 2019

J of Applied Polymer Sci

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A cocuring agent is necessary for tetrafluoroethylene–propylene elastomer (FEPM), which cannot be cured by peroxide alone. We observed that high‐vinyl polybutadiene rubber (HVBR) could be used as a cocuring agent for FEPM. The structure and properties of FEPM–HVBR blend vulcanizates were investigated by 13C‐NMR, differential scanning calorimetry, swelling tests, tensile tests, dynamic mechanical analysis, and thermogravimetric analysis. This research showed that HVBR significantly improved FEPM by conferring a high crosslink degree to the FEPM–HVBR blends. When the HVBR concentration was 25% without any filler reinforcement, the tensile strength of the FEPM–HVBR blend vulcanizate reached 11.6 MPa, and the crosslinking density reached 171 μmol/cm3. In addition, HVBR improved the thermal stability of FEPM and changed the glass‐transition temperature (T g) of the blend; as the HVBR content increased, the T g of the blend also increased. 13C‐NMR analysis confirmed that crosslinks existed between the HVBR and FEPM macromolecules. When the blends contained trace amounts of HVBR, free‐radical reaction was more preferred between FEPM and HVBR, whereas when HVBR was 15% or more, crosslinking between HVBR was predominant. These findings expand the choices for the curing of FEPM. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47836.

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Influence of 1,2‐polybutadiene on properties of dicumyl peroxide cured brominated butyl rubber

Cited by 17 publications

References 19 publications

Cross‐linking and properties of rubber magnetic composites cured with different curing systems

Cross‐linking and properties of rubber magnetic composites cured with different curing systems

Synergistic effect of SBS and trimethylopropane trimethacrylate (TMPTMA) on dynamically vulcanized SEBS/PP blends

Curing of a tetrafluoroethylene–propylene elastomer with high‐vinyl polybutadiene rubber and peroxide

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