Scholarlink

<p>Poly(isosorbide-<i>co</i>-1,4-cyclohexanedimethylene terephthalate) (PICT) exhibits a distinctive rose-patterned spherulitic morphology during crystallization, which has rarely been observed in bio-based polyesters. In this study, the origin of this unique morphology and its relationship with crystallization behavior were investigated. When crystallized at 200&#xa0;°C for 20&#xa0;min with 12&#xa0;mol% incorporation of isosorbide (ISB), a biomass-derived rigid monomer, PICT formed rose-patterned spherulites. Thermal analysis revealed the presence of two distinct crystalline populations, namely stable and metastable forms, as evidenced by multiple melting endotherms similar to those observed in poly(1,4-cyclohexanedimethylene terephthalate) (PCT). The incorporation of ISB not only reduced the melting temperature and crystallization rate compared to PCT but also introduced dynamic heterogeneity into the system. Finally, for the first time, two-dimensional correlation spectroscopy (2DCOS) was employed along with the spin–lattice relaxation time obtained from solid-state cross polarization/magic angle spinning (CP-MAS) <sup>13</sup>C NMR spectroscopy to determine the transitional sequence of the functional group inclusion/exclusion, and to reveal the motional capacity of each monomer arising from the environment-dependent relaxation behavior.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Morphological and Crystallization Insights into Poly(isosorbide-co-1,4-cyclohexanedimethylene terephthalate): A Study of Unique Spherulitic Structures

  • 期刊论文

  • 发表日期：

    2025年10月28日

查看全文
  • Young Jae Lee,
  • Gyeong Cheol Yu,
  • So Young Jeon,
  • Seon Mi Kim,
  • Sung Bae Park,
  • Dong Ki Hwang,
  • Jun Mo Koo

摘要

Poly(isosorbide-co-1,4-cyclohexanedimethylene terephthalate) (PICT) exhibits a distinctive rose-patterned spherulitic morphology during crystallization, which has rarely been observed in bio-based polyesters. In this study, the origin of this unique morphology and its relationship with crystallization behavior were investigated. When crystallized at 200 °C for 20 min with 12 mol% incorporation of isosorbide (ISB), a biomass-derived rigid monomer, PICT formed rose-patterned spherulites. Thermal analysis revealed the presence of two distinct crystalline populations, namely stable and metastable forms, as evidenced by multiple melting endotherms similar to those observed in poly(1,4-cyclohexanedimethylene terephthalate) (PCT). The incorporation of ISB not only reduced the melting temperature and crystallization rate compared to PCT but also introduced dynamic heterogeneity into the system. Finally, for the first time, two-dimensional correlation spectroscopy (2DCOS) was employed along with the spin–lattice relaxation time obtained from solid-state cross polarization/magic angle spinning (CP-MAS) 13C NMR spectroscopy to determine the transitional sequence of the functional group inclusion/exclusion, and to reveal the motional capacity of each monomer arising from the environment-dependent relaxation behavior.

Graphical Abstract