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Using dual-cure architectures in HNBR: A detailed insight into their structure-property relationship.

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Title: Using dual-cure architectures in HNBR: A detailed insight into their structure-property relationship.
Authors: Dhar, Sharmistha1, Parathodika, Arshad Rahman1, Dey, Dibyendu1, Naskar, Kinsuk1,2 knaskar@rtc.iitkgp.ac.in
Source: Express Polymer Letters. May2026, Vol. 20 Issue 5, p514-530. 17p.
Subjects: Vulcanization, Thermal stability, Polymer networks, Nitrile rubber
Abstract: Hydrogenated acrylonitrile-butadiene rubber (HNBR) is widely used in automotive and sealing applications due to its oil resistance and mechanical durability; however, its long-term performance is significantly influenced by the curing chemistry. Sulfur vulcanization offers superior elasticity but restricted thermal stability, while peroxide curing improves heat resistance at the expense of flexibility. In this study, we investigate hybrid sulfur-peroxide curing to integrate these benefits. The hybrid pathway encompasses competitive and sequential processes, such as partial radical quenching and accelerator oxidation, resulting in a dual crosslink network. Dynamic mechanical, thermal, and temperature scanning stress relaxation (TSSR) evaluations demonstrate that hybrid systems provide precise modulation of the operational temperature-frequency range, broaden the glass-transition relaxation, and control stress dissipation. The coexistence of sulfur and C-C crosslinks results in a heterogeneous structure characterized by diverse crosslink densities and bond energies, leading to numerous relaxation modes and an optimal blend of elasticity, strength, and thermal stability. Microscopy confirms the absence of phase separation, indicating that hybrid vulcanization is a viable approach for producing robust, high-performance HNBR elastomers. [ABSTRACT FROM AUTHOR]
Copyright of Express Polymer Letters is the property of Budapest University of Technology & Economics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="DE" term="%22Vulcanization%22">Vulcanization</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+networks%22">Polymer networks</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrile+rubber%22">Nitrile rubber</searchLink>
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  Data: Hydrogenated acrylonitrile-butadiene rubber (HNBR) is widely used in automotive and sealing applications due to its oil resistance and mechanical durability; however, its long-term performance is significantly influenced by the curing chemistry. Sulfur vulcanization offers superior elasticity but restricted thermal stability, while peroxide curing improves heat resistance at the expense of flexibility. In this study, we investigate hybrid sulfur-peroxide curing to integrate these benefits. The hybrid pathway encompasses competitive and sequential processes, such as partial radical quenching and accelerator oxidation, resulting in a dual crosslink network. Dynamic mechanical, thermal, and temperature scanning stress relaxation (TSSR) evaluations demonstrate that hybrid systems provide precise modulation of the operational temperature-frequency range, broaden the glass-transition relaxation, and control stress dissipation. The coexistence of sulfur and C-C crosslinks results in a heterogeneous structure characterized by diverse crosslink densities and bond energies, leading to numerous relaxation modes and an optimal blend of elasticity, strength, and thermal stability. Microscopy confirms the absence of phase separation, indicating that hybrid vulcanization is a viable approach for producing robust, high-performance HNBR elastomers. [ABSTRACT FROM AUTHOR]
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  Label:
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  Data: <i>Copyright of Express Polymer Letters is the property of Budapest University of Technology & Economics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.3144/expresspolymlett.2026.39
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      – Code: eng
        Text: English
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        PageCount: 17
        StartPage: 514
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      – SubjectFull: Vulcanization
        Type: general
      – SubjectFull: Thermal stability
        Type: general
      – SubjectFull: Polymer networks
        Type: general
      – SubjectFull: Nitrile rubber
        Type: general
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      – TitleFull: Using dual-cure architectures in HNBR: A detailed insight into their structure-property relationship.
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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