Synthesis and characterization of UV-curable polyurethane acrylates derived from trimethylolpropane and hydroxyethyl methacrylate: Effect of 2-hydroxyethyl methacrylate (HEMA) content on thermal stability, gloss properties, and microstructure

EREN B., Karaçoban E. D., Erdoğan B.

Polymer Engineering and Science, 2024 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1002/pen.27012
  • Dergi Adı: Polymer Engineering and Science
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Applied Science & Technology Source, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: deconvolution analysis, microphase, microstructure, polyurethane acrylate, SEM
  • Bilecik Şeyh Edebali Üniversitesi Adresli: Evet

Özet

This study presents the synthesis of a series of ultraviolet (UV)-curable polyurethane acrylates (PUAs) derived from trimethylolpropane (TMP) and 2-hydroxyethyl methacrylate (HEMA) through a one-step polymerization method. Fourier transform infrared (FTIR) reveals distinct vibration bands corresponding to different functional groups within the polyurethane structure and was used to explore microphase separation in these PUAs. Thermogravimetric analysis demonstrates two degradation steps in UV-cured PUA films, revealing the influence of HEMA content on thermal stability. Gloss properties exhibit a complex relationship with HEMA content, with initial improvement followed by a decline. Hydrophilic/hydrophobic properties, measured by contact angle values, indicate increased cross-linking and less polar surfaces with higher HEMA content. UV-cured PUA films achieve effective chemical cross-linking and a dense microstructure, contributing to enhanced film properties. Highlights: HEMA's diluent effect increases the exposure of hydrophobic groups on the surface. FTIR with deconvolution techniques were used to analyze H-bonding and microphase. Excessive HEMA led to phase separation and surface defects, reducing gloss. Formation of H-bonds between N–H and C=O increased effective cross-link density.