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Remarkable mechanical performance at low temperatures of hydroxy-terminated polybutadiene enhanced by hyperbranched polysiloxane

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Abstract

The inadequate mechanical properties and limited low temperature adaptability of Hydroxy-terminated polybutadiene (HTPB) impose constraints on its practical utilization in solid propellant applications. In the present investigation, a pioneering approach involved the synthesis of a novel hyperbranched polysiloxane, denoted as HBPSi-NH2, which encompasses –NH2 groups and Si–O–C chains. The HBPSi-NH2 with its unique flexible Si–O–C segments, serving as the soft component in the crosslinked network, in conjunction with the curing agent TDI as the hard component, achieves a synergistic balance of rigidity and flexibility. The resulting HTPB composites not only demonstrate enhanced mechanical properties but also exhibit excellent low temperature adaptability. Remarkably, the HTPB composites exhibit excellent mechanical properties at both 25 °C (0.74 MPa ~ 2.08 MPa) and − 40 °C (1.77 MPa ~ 12.49 MPa). This enhancement can be ascribed to the abundant presence of functional groups, namely –OH and –NH2. These active groups significantly augment the cross-linking density within the HTPB system, also promote the formation of numerous hydrogen bonds, enhancing the strength of HTPB. Simultaneously, the abundant presence of Si–O–C flexible chain segments within HBPSi-NH2 enhances the reactivity of the HTPB molecular chains, not only improving the toughness of HTPB but also significantly reducing its Tg (− 65.95 °C to − 75.62 °C). Furthermore, this study establishes a pivotal direction for the design and synthesis of high-performance HTPB-PU materials.

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Data Availability

No datasets were generated or analysed during the current study.

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Acknowledgements

This work is sponsored by the National Natural Science Foundation of China (22175143) and Foundation of Science and Technology on Combustion and Explosion Laboratory (J-JK-JJ-2201/6142603032210). Thanks to the Analytical & Testing Center of Northwestern Polytechnical University for test assistance.

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Author notes

  1. Junshan Yuan and **aoying Huang are contribute equally to this work.

Authors and Affiliations

  1. Key Laboratory of Polymer Science and Technology of Shaanxi Province, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, **’an, 710072, China

    Junshan Yuan, **aoying Huang, Rui Wang, Weixu Feng & Hongxia Yan

  2. **’an Modern Chemistry Research Institute, **’an, 710065, China

    **aoying Huang

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Contributions

Junshan Yuan: Conceptualization, Formal analysis, Writing - original draft. **aoying Huang: Investigation. Rui Wang: Review. Wei Tian: Supervision. Weixu Feng: Supervision. Hongxia Yan: Conceptualization, Writing - review & editing.

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Correspondence to Hongxia Yan.

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Yuan, J., Huang, X., Wang, R. et al. Remarkable mechanical performance at low temperatures of hydroxy-terminated polybutadiene enhanced by hyperbranched polysiloxane. Polym. Bull. (2024). https://doi.org/10.1007/s00289-024-05374-y

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