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<p>The development of degradable and chemically recyclable polymers is a promising strategy to address pressing environmental and resource-related challenges. Despite significant progress, there is a need for continuous development of such recyclable polymers. Herein, PPDO-PLLA-PU copolymers were synthesized from poly(<i>p</i>-dioxanone)-diol (PPDO-diol) and poly(L-lactide)-diol (PLLA-diol) by chain extension reaction. The chemical structures and microphase structures of PPDO-PLLA-PU were characterized, and their crystalline properties, mechanical properties, and degradation behaviors were further investigated. Significantly, the distribution of PLLA phase in the copolymer matrix showed a rod-like microstructure with a slight orientation, despite the thermodynamic incompatibility of PPDO and PLLA segments. Moreover, on the basis of this microphase separation, PPDO spherulites can crystallize using the interface of the two phases as nucleation sites. Accordingly, the combined effect of above two contributes to the enhanced mechanical properties. In addition, PPDO-PLLA-PU copolymers have good processability and recyclability, making them valuable for a wide range of applications.</p>

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Recyclable and Degradable Poly(p-dioxanone)-based Copolymer with Enhanced Mechanical Properties by Microphase-separated Interface Crystallization

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Li Huang,
  • Jie Zhang,
  • Si-Chong Chen,
  • Gang Wu,
  • Yu-Zhong Wang

摘要

The development of degradable and chemically recyclable polymers is a promising strategy to address pressing environmental and resource-related challenges. Despite significant progress, there is a need for continuous development of such recyclable polymers. Herein, PPDO-PLLA-PU copolymers were synthesized from poly(p-dioxanone)-diol (PPDO-diol) and poly(L-lactide)-diol (PLLA-diol) by chain extension reaction. The chemical structures and microphase structures of PPDO-PLLA-PU were characterized, and their crystalline properties, mechanical properties, and degradation behaviors were further investigated. Significantly, the distribution of PLLA phase in the copolymer matrix showed a rod-like microstructure with a slight orientation, despite the thermodynamic incompatibility of PPDO and PLLA segments. Moreover, on the basis of this microphase separation, PPDO spherulites can crystallize using the interface of the two phases as nucleation sites. Accordingly, the combined effect of above two contributes to the enhanced mechanical properties. In addition, PPDO-PLLA-PU copolymers have good processability and recyclability, making them valuable for a wide range of applications.