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Relaxation spectrum of poly(styrene-b-isoprene-b-styrene) triblock copolymer

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Abstract

A relatively complete continuous relaxation spectrum H(τ) of poly(styrene-b-isoprene-b-styrene) (SIS) two-phase system was divided into five regions based on the variation of H(τ) strength, which corresponded to: (1) glass transition of PI phase, (2) high elastic state of PI phase, (3) glass transition of PS phase, (4) high elastic state of PS phase, and (5) viscous flow state of the entire SIS molecular chain. Five regions only appeared in SIS1105, because the molecular of SIS1105 experienced glass transition of PI block, PS block, and viscous flow of the whole molecular chain. The stress relaxation of SIS was influenced by the S/I ratios, because the PS microdomains ultimately determined the relaxation characteristics. The stress relaxation of SIS system was also closely related to the viscous flow transition temperature (Tf). When the S/I ratio was low (15/85), forced stress relaxation occurred; when the S/I ratio was high (29/71 and 45/55), the SIS system did not show stress relaxation below the Tf. When the temperature was higher than the Tf, the S/I ratio did not affect the stress relaxation. The relaxation information obtained from the Cole–Cole diagram further verified the analysis of the continuous relaxation spectrum H(τ) and stress relaxation.

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Data availability

The data that support the findings of this study are available on request from the corresponding author, [hhq@qust.edu.cn], upon reasonable request.

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Acknowledgements

This work was supported by the Natural Science Foundation of Shandong Province (ZR2022ME142).

Funding

This study was funded by Natural Science Foundation of Shandong Province, ZR2022ME142, Haiqing Hu.

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Authors and Affiliations

  1. Northwest Rubber and Plastics Research and Design Institute Co., Ltd., Xianyang, 712023, People’s Republic of China

    Hengyu Luo

  2. College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People’s Republic of China

    Hengyu Luo, Zihao Shang, Hui Han & Haiqing Hu

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  1. Hengyu Luo
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Correspondence to Haiqing Hu.

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Luo, H., Shang, Z., Han, H. et al. Relaxation spectrum of poly(styrene-b-isoprene-b-styrene) triblock copolymer. Iran Polym J (2024). https://doi.org/10.1007/s13726-024-01328-3

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