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<p>The presence of rigid benzene rings and short methylene sequences on the backbone of poly(ethylene terephthalate) (PET) brings about its low crystallization rate and poor impact toughness. In this work, hydroxyl-terminated hyperbranched polyester (HBP-OH) was introduced into PET via melt blending, and its effect on the crystallization and mechanical properties of PET were systematically investigated. The results indicated that, due to the highly branched structure of HBP-OH as well as the formation of intermolecular hydrogen bonds between HBP-OH and PET, HBP-OH plays dual roles of excellent nucleating agent and crystallization accelerator at a very low content, significantly increasing the melt-crystallization temperature and reducing the nucleation parameter and fold surface free energy of PET. The isothermal crystallization kinetics revealed that the increase in nucleation rate gives rise to remarkable elevation of overall crystallization rate of PET. Moreover, the introduction of HBP-OH demonstrated a pronounced toughening effect on PET. The favorable heterogeneous nucleation and plasticizing effects of HBP-OH are responsible for the enhanced impact toughness of PET blended with HBP-OH. This work provides an effective method to simultaneously achieve remarkable crystallization promotion and improved impact toughness of PET.</p>

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Remarkable crystallization promotion and improved impact toughness of poly(ethylene terephthalate) realized by incorporating hydroxyl-terminated hyperbranched polyester simultaneously as nucleating agent and chain mobility promoter

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Jingru Liu,
  • Wang Wang

摘要

The presence of rigid benzene rings and short methylene sequences on the backbone of poly(ethylene terephthalate) (PET) brings about its low crystallization rate and poor impact toughness. In this work, hydroxyl-terminated hyperbranched polyester (HBP-OH) was introduced into PET via melt blending, and its effect on the crystallization and mechanical properties of PET were systematically investigated. The results indicated that, due to the highly branched structure of HBP-OH as well as the formation of intermolecular hydrogen bonds between HBP-OH and PET, HBP-OH plays dual roles of excellent nucleating agent and crystallization accelerator at a very low content, significantly increasing the melt-crystallization temperature and reducing the nucleation parameter and fold surface free energy of PET. The isothermal crystallization kinetics revealed that the increase in nucleation rate gives rise to remarkable elevation of overall crystallization rate of PET. Moreover, the introduction of HBP-OH demonstrated a pronounced toughening effect on PET. The favorable heterogeneous nucleation and plasticizing effects of HBP-OH are responsible for the enhanced impact toughness of PET blended with HBP-OH. This work provides an effective method to simultaneously achieve remarkable crystallization promotion and improved impact toughness of PET.