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<p>The incorporation of 1- and 2-propanol into the nanoporous crystalline δ-form of syndiotactic polystyrene (NC δ-sPS) was investigated using infrared spectroscopy. When the NC δ-sPS film was immersed in 1- and 2-propanol, both alcohols were incorporated not only into the nanopores of the NC δ-sPS but also into the free volume of the amorphous regions, as evidenced by the OH stretching bands observed at 3595 and 3340 cm⁻¹ in the infrared spectra, respectively. Variation in the immersion temperature revealed that higher temperatures, such as 70 °C, enhanced the diffusion of both propanols into the NC δ-sPS. The incorporation of propanol from aqueous solutions was subsequently examined as a function of the propanol content at 70 °C. The concentration of propanol incorporated into the NC δ-sPS was categorized into three distinct regions based on propanol content: weight fractions of 0–0.2, 0.2–0.8, and 0.8–1.0. These regions reflect the clustering behavior of propanol and water molecules. At lower propanol contents, propanol molecules are predominantly surrounded by water molecules. In contrast, when the propanol content exceeds 0.8, propanol becomes the dominant component, leading to a larger diffusion coefficient and enhanced propanol incorporation.</p>

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Incorporation of 1- and 2-propanol using nanoporous eight-helical crystalline syndiotactic polystyrene

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Daiki Fujiwara,
  • Takahiko Nakaoki,
  • Paola Rizzo

摘要

The incorporation of 1- and 2-propanol into the nanoporous crystalline δ-form of syndiotactic polystyrene (NC δ-sPS) was investigated using infrared spectroscopy. When the NC δ-sPS film was immersed in 1- and 2-propanol, both alcohols were incorporated not only into the nanopores of the NC δ-sPS but also into the free volume of the amorphous regions, as evidenced by the OH stretching bands observed at 3595 and 3340 cm⁻¹ in the infrared spectra, respectively. Variation in the immersion temperature revealed that higher temperatures, such as 70 °C, enhanced the diffusion of both propanols into the NC δ-sPS. The incorporation of propanol from aqueous solutions was subsequently examined as a function of the propanol content at 70 °C. The concentration of propanol incorporated into the NC δ-sPS was categorized into three distinct regions based on propanol content: weight fractions of 0–0.2, 0.2–0.8, and 0.8–1.0. These regions reflect the clustering behavior of propanol and water molecules. At lower propanol contents, propanol molecules are predominantly surrounded by water molecules. In contrast, when the propanol content exceeds 0.8, propanol becomes the dominant component, leading to a larger diffusion coefficient and enhanced propanol incorporation.