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<p>This study presents a simple approach for producing hydrophobic cotton fabrics through thiol-ene crosslinking of organosilicon compounds directly on the fiber surface. Cotton fabrics were modified with poly(vinylmethyl-co-dimethyl)siloxane and two thiol crosslinkers, namely ethylene glycol bis(3-mercaptopropionate) and pentaerythritol tetrakis(3-mercaptopropionate). The crosslinking process was carried out using two initiation systems: the photoinitiator 2,2-dimethoxy-2-phenylacetophenone under UV irradiation, and the thermal initiator 2,2′-azobisisobutyronitrile under heating. The hydrophobic performance of the modified fabrics was evaluated by water contact angle measurements and by droplet stability tests. In addition, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), and SEM energy-dispersive X-ray spectroscopy (SEM–EDS) were employed to confirm the presence of the deposited organosilicon layer and to assess the surface morphology of the treated textiles. The results demonstrated that all modification systems imparted a highly hydrophobic character to cotton fabrics, with the best-performing samples reaching values at the threshold of superhydrophobicity. The most effective variants also exhibited high droplet stability, indicating improved resistance to water penetration. Importantly, the modified fabrics retained their hydrophobic properties after repeated washing, confirming the good durability of the deposited crosslinked siloxane layer.</p>

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Hydrophobic Cotton Fabrics via Surface Thiol-Ene Crosslinking of Functional Polysiloxanes (Chojnowski Memorial Issue)

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Marta Kaczmarek,
  • Marcin Przybylak,
  • Agnieszka Dutkiewicz,
  • Hieronim Maciejewski

摘要

This study presents a simple approach for producing hydrophobic cotton fabrics through thiol-ene crosslinking of organosilicon compounds directly on the fiber surface. Cotton fabrics were modified with poly(vinylmethyl-co-dimethyl)siloxane and two thiol crosslinkers, namely ethylene glycol bis(3-mercaptopropionate) and pentaerythritol tetrakis(3-mercaptopropionate). The crosslinking process was carried out using two initiation systems: the photoinitiator 2,2-dimethoxy-2-phenylacetophenone under UV irradiation, and the thermal initiator 2,2′-azobisisobutyronitrile under heating. The hydrophobic performance of the modified fabrics was evaluated by water contact angle measurements and by droplet stability tests. In addition, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), and SEM energy-dispersive X-ray spectroscopy (SEM–EDS) were employed to confirm the presence of the deposited organosilicon layer and to assess the surface morphology of the treated textiles. The results demonstrated that all modification systems imparted a highly hydrophobic character to cotton fabrics, with the best-performing samples reaching values at the threshold of superhydrophobicity. The most effective variants also exhibited high droplet stability, indicating improved resistance to water penetration. Importantly, the modified fabrics retained their hydrophobic properties after repeated washing, confirming the good durability of the deposited crosslinked siloxane layer.