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Effect of substituted positions of acetylene groups in benzene rings on the properties of poly(silane arylether arylacetylene)s

Polymer Journal volume 55, pages 1307–1315 (2023)Cite this article

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Abstract

Performing investigations on the structure-property relationship of poly(silane arylether arylacetylene)s (PSEAs) is very important and instructive for designing novel high-performance polymers. In this work, three bifunctional acetylene-terminated triphenyl-ether monomers with either para-acetylene, meta-acetylene or ortho-acetylene, i.e., 1,3-bis(4'-ethynylphenoxy)benzene (pmp-BEPB), 1,3-bis(3'-ethynylphenoxy)benzene (mmm-BEPB) and 1,3-bis(2'-ethynylphenoxy)benzene (omo-BEPB) were synthesized and used to prepare three PSEA resins, namely, pmp-PSEA, mmm-PSEA and omo-PSEA. The PSEA resins were characterized by 1H-nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction analysis, and the properties were explored. The resins possess a wide processing window in the following order: pmp-PSEA < mmm-PSEA < omo-PSEA. The DSC results revealed that pmp-PSEA shows the highest reactivity, followed by omo-PSEA and mmm-PSEA. In the cured networks of the resins, the densities increase in the following order: pmp-PSEA-C < mmm-PSEA-C < omo-PSEA-C. Compared with pmp-PSEA-C, mmm-PSEA-C possesses better mechanical properties with a flexural strength of 66.5 MPa and a flexural modulus of 3.71 GPa. The decomposition temperatures of 5% weight loss (Td5) of pmp-PSEA-C and mmm-PSEA-C are over 530 °C.

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Acknowledgements

The authors gratefully acknowledge the support of the Fundamental Research Funds for the Central Universities (JKD01231701).

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  1. Key Laboratory for Specially Functional Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

    Jixian Li, Changjun Gong, Junkun Tang, Qiaolong Yuan, Zuozhen Liu & Farong Huang

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Correspondence to Farong Huang.

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Li, J., Gong, C., Tang, J. et al. Effect of substituted positions of acetylene groups in benzene rings on the properties of poly(silane arylether arylacetylene)s. Polym J 55, 1307–1315 (2023). https://doi.org/10.1038/s41428-023-00819-z

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