Influence of SBR Content on the Mechanical, Thermal, and Morphological Behavior of NR–SBR Rubber Composites

DOI

10.2991/978-94-6239-668-5_11How to use a DOI?

Keywords

Natural rubber; Styrene–butadiene rubber; mechanical properties; thermal stability; carbon black

Abstract

This study examines how different amounts of styrene–butadiene rubber (SBR) affects the mechanical and thermal properties of natural rubber (NR) composites. NR–SBR blends containing 0, 10, 20, 30, and 50 wt% SBR were prepared with a constant carbon black content (30 phr) and standard curing additives. The compounds were mixed using a two-roll mill and vulcanized at 160 ℃ under a pressure of 10 MPa for the optimum curing time (t₉₀).

Mechanical test results showed that tensile strength and modulus at 100% strain increased as the SBR content increased, indicating higher stiffness and better load-bearing ability. In contrast, elongation at break decreased, which can be explained by reduced molecular chain mobility and partial phase separation between NR and SBR phases. Shore A hardness also increased gradually, confirming the higher rigidity of blends with more SBR.

Dynamic mechanical analysis (DMA) revealed that the glass transition temperature (Tg) shifted to higher values with increasing SBR content. Thermogravimetric analysis (TGA) showed a slight improvement in thermal stability. Overall, the results indicate that blends containing 20–30 wt% SBR offer a good balance between elasticity, mechanical strength, and thermal performance. Therefore, NR–SBR composites with this composition are suitable for applications such as tire treads, seals, and vibration-damping materials. The relationship between filler dispersion, morphological compatibility, and the observed properties is also discussed.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Ibrahim Movlayev
AU  - Gunel Azizova
AU  - Samira Bayramova
AU  - Konul Iravanli
AU  - Firangiz Rahimova
AU  - Guljannat Mammadova
PY  - 2026
DA  - 2026/05/14
TI  - Influence of SBR Content on the Mechanical, Thermal, and Morphological Behavior of NR–SBR Rubber Composites
BT  - Proceedings of the International Conference on Current Problems in Engineering and Applied Sciences (ICCPEAS 2025)
PB  - Atlantis Press
SP  - 102
EP  - 111
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6239-668-5_11
DO  - 10.2991/978-94-6239-668-5_11
ID  - Movlayev2026
ER  -