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<p>The stretching-induced phase transition of biodegradable poly(butylene succinate) (PBS) was explored using a combination of mechanical testing and <i>in situ</i> wide angle X-ray diffraction characterization. The phase transition from <i>α</i> phase to <i>β</i> phase can be effectively triggered by severe stretching, in which the threshold strain is dependent on the PBS crystallites. Interestingly, this <i>α</i>-<i>β</i> phase transition can be reversed immediately once mechanical stretching begins to be released. It should be pointed out that the finish of <i>β</i>-<i>α</i> phase transition reversed, corresponding to the disappearance of the generated <i>β</i> phase, does not necessarily need the external stretching to completely release. For the relaxation-reversed phase transition, the evolution of the normalized <i>β</i>-phase fraction exhibited a similar correlation with the stress released. It was indicated that the decay kinetics followed a stretching-dominant mechanism, and the amount of <i>β</i> phase generated just prior to relaxation had a negligible influence on the reversed phase transition.</p>

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Relaxation-reversed Phase Transition of Poly(butylene succinate)

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Jia-Liang Qiao,
  • Xin-Yu Liu,
  • Ying-Zhuo Liu,
  • Gui-Qiu Ma,
  • Zhe Ma

摘要

The stretching-induced phase transition of biodegradable poly(butylene succinate) (PBS) was explored using a combination of mechanical testing and in situ wide angle X-ray diffraction characterization. The phase transition from α phase to β phase can be effectively triggered by severe stretching, in which the threshold strain is dependent on the PBS crystallites. Interestingly, this α-β phase transition can be reversed immediately once mechanical stretching begins to be released. It should be pointed out that the finish of β-α phase transition reversed, corresponding to the disappearance of the generated β phase, does not necessarily need the external stretching to completely release. For the relaxation-reversed phase transition, the evolution of the normalized β-phase fraction exhibited a similar correlation with the stress released. It was indicated that the decay kinetics followed a stretching-dominant mechanism, and the amount of β phase generated just prior to relaxation had a negligible influence on the reversed phase transition.