Scholarlink

<p>The morphology and filtration properties of the porous polyimide materials prepared as a result of processing of prepolymers: copoly(urethane-imides) (CPUI) of varied chemical composition. The destruction of polyether units linked with polyimide units <i>via</i> isocyanate groups in the initial copolymers and formation of a porous material with the poly(urethane-imide) structure occur during calendering and controlled annealing of microfibrous fabrics. In this case, shrinkage of the fabrics and a decrease in the pore size were observed. Polycaprolactone, 2,4-toluylene diisocyanate, 4,4′-oxydianiline, pyromellic dianhydride, and 3,3′,4,4′-oxydiphthalic anhydride were used in CPUI synthesis. The CPUI samples were studied by thermogravimetric analysis and scanning electron microscopy. Their deformation and strength properties were determined. The influence of both CPUI chemical structure and calendering and subsequent thermal annealing modes on the morphological structure and filtration characteristics of the final materials was shown. The final porous materials derived from the CPUI-III and CPUI-IV samples demonstrate optimal filtration properties: the permeability values for pure DMF are 281.6 and 278.0 kg (m<sup>2</sup> h atm)<sup>−1</sup>, respectively, while for a dye solution in DMF they are 93.9 and 111.9 kg (m<sup>2</sup> h atm)<sup>−1</sup>, and the phthalocyanine retention coefficient is 98% and higher. According to these characteristics, the prepared filtration materials are close to ultrafiltration membranes.</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

Morphology and filtration properties of porous hard-to-soft polyimides based on calendered electrospun copoly(urethane-imides)

  • 期刊论文

  • 发表日期：

    2026年1月1日

查看全文
  • E. M. Ivan’kova,
  • I. V. Kuntsman,
  • A. L. Didenko,
  • G. V. Vaganov,
  • A. S. Nesterova,
  • V. K. Lavrent’ev,
  • V. E. Kraft,
  • T. S. Anokhina,
  • I. L. Borisov,
  • I. V. Abalov,
  • A. O. Malakhov,
  • V. V. Kudryavtsev

摘要

The morphology and filtration properties of the porous polyimide materials prepared as a result of processing of prepolymers: copoly(urethane-imides) (CPUI) of varied chemical composition. The destruction of polyether units linked with polyimide units via isocyanate groups in the initial copolymers and formation of a porous material with the poly(urethane-imide) structure occur during calendering and controlled annealing of microfibrous fabrics. In this case, shrinkage of the fabrics and a decrease in the pore size were observed. Polycaprolactone, 2,4-toluylene diisocyanate, 4,4′-oxydianiline, pyromellic dianhydride, and 3,3′,4,4′-oxydiphthalic anhydride were used in CPUI synthesis. The CPUI samples were studied by thermogravimetric analysis and scanning electron microscopy. Their deformation and strength properties were determined. The influence of both CPUI chemical structure and calendering and subsequent thermal annealing modes on the morphological structure and filtration characteristics of the final materials was shown. The final porous materials derived from the CPUI-III and CPUI-IV samples demonstrate optimal filtration properties: the permeability values for pure DMF are 281.6 and 278.0 kg (m2 h atm)−1, respectively, while for a dye solution in DMF they are 93.9 and 111.9 kg (m2 h atm)−1, and the phthalocyanine retention coefficient is 98% and higher. According to these characteristics, the prepared filtration materials are close to ultrafiltration membranes.