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<p>Porphyrins and their metal complexes immobilized in a polymer matrix are attracting an increasing attention from the scientific community due to the variety of the resulting systems properties, which are important for use in chemistry, biology, and medicine. In the present work, supramolecular systems of polylactide–manganese Mn(III) complex of 5,10,15,20-tetrakis(4-<i>n</i>-hexyloxyphenyl)porphyrin were received and the physicochemical properties of the resulting films were investigated. Film samples were obtained by solution casting method. Immobilization of porphyrin was confirmed by UV–vis spectrophotometry. In contrast with pure polylactide, Soret band at 482&#xa0;nm and Q—bands were observed in the composite samples. The influence of the porphyrin metal complex on the thermophysical characteristics and linear expansion coefficient of the samples were studied. With an increase in the porphyrin content, the glass transition temperature and cold crystallization of polylactide shifts toward higher temperatures, the degree of crystallinity of PLA changes in a wave-like manner, and the coefficient of linear expansion increases significantly. Measurements of the contact angle of the surface of film samples showed an increase in hydrophilicity with the addition of a manganese porphyrin complex in the polylactide matrix. The properties of the new functional composites were compared with previously obtained PLA samples with unsubstituted Mn(III) complex of tetraphenylporphyrin.</p>

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Physicochemical Properties of Metalloporphyrin–Polylactide Supramolecular System

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Yulia Tertyshnaya,
  • Kseniya Zhdanova,
  • Valentina Siracusa,
  • Natal’ya Bragina

摘要

Porphyrins and their metal complexes immobilized in a polymer matrix are attracting an increasing attention from the scientific community due to the variety of the resulting systems properties, which are important for use in chemistry, biology, and medicine. In the present work, supramolecular systems of polylactide–manganese Mn(III) complex of 5,10,15,20-tetrakis(4-n-hexyloxyphenyl)porphyrin were received and the physicochemical properties of the resulting films were investigated. Film samples were obtained by solution casting method. Immobilization of porphyrin was confirmed by UV–vis spectrophotometry. In contrast with pure polylactide, Soret band at 482 nm and Q—bands were observed in the composite samples. The influence of the porphyrin metal complex on the thermophysical characteristics and linear expansion coefficient of the samples were studied. With an increase in the porphyrin content, the glass transition temperature and cold crystallization of polylactide shifts toward higher temperatures, the degree of crystallinity of PLA changes in a wave-like manner, and the coefficient of linear expansion increases significantly. Measurements of the contact angle of the surface of film samples showed an increase in hydrophilicity with the addition of a manganese porphyrin complex in the polylactide matrix. The properties of the new functional composites were compared with previously obtained PLA samples with unsubstituted Mn(III) complex of tetraphenylporphyrin.