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<p>In this study, we investigated the graft copolymerization of triethylene glycol dimethacrylate (TEGDMA), a dimethacrylate monomer, onto natural rubber in its latex form. Graft copolymerization involves the reaction of TEGDMA with deproteinized natural rubber (DPNR) in the presence of a tetraethylenepentamine/tert-butyl hydroperoxide redox initiator. Two different initiator concentrations, 0.033 and 0.066 mol/kg rubber, as well as two monomer concentrations, 0.25 and 0.5 mol/kg rubber, were used. The resulting graft copolymers were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. Both FTIR and NMR analyses confirmed the successful grafting of TEGDMA onto DPNR, resulting in the formation of DPNR-<i>graft</i>-poly(TEGDMA). The properties of the graft copolymer were evaluated through various methods, including swelling tests, differential scanning calorimetry (DSC), tensile strength measurements, dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA). The gel content of DPNR increased dramatically after graft copolymerization, reaching 80–90%. Additionally, the glass transition temperature (Tg) shifted from −65.9 °C for DPNR to −67.7 °C for DPNR-<i>graft</i>-poly(TEGDMA) 0.033-0.5. Transmission electron microscopy (TEM) images revealed the formation of a poly(TEGDMA) layer surrounding the rubber molecules, creating a nanomatrix structure.</p>

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Graft copolymerization of triethylene glycol dimethacrylate onto natural rubber

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Thuong Thi Nghiem,
  • Trang Nguyen Thu,
  • Nurul Hayati Yusof,
  • Seiichi Kawahara

摘要

In this study, we investigated the graft copolymerization of triethylene glycol dimethacrylate (TEGDMA), a dimethacrylate monomer, onto natural rubber in its latex form. Graft copolymerization involves the reaction of TEGDMA with deproteinized natural rubber (DPNR) in the presence of a tetraethylenepentamine/tert-butyl hydroperoxide redox initiator. Two different initiator concentrations, 0.033 and 0.066 mol/kg rubber, as well as two monomer concentrations, 0.25 and 0.5 mol/kg rubber, were used. The resulting graft copolymers were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. Both FTIR and NMR analyses confirmed the successful grafting of TEGDMA onto DPNR, resulting in the formation of DPNR-graft-poly(TEGDMA). The properties of the graft copolymer were evaluated through various methods, including swelling tests, differential scanning calorimetry (DSC), tensile strength measurements, dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA). The gel content of DPNR increased dramatically after graft copolymerization, reaching 80–90%. Additionally, the glass transition temperature (Tg) shifted from −65.9 °C for DPNR to −67.7 °C for DPNR-graft-poly(TEGDMA) 0.033-0.5. Transmission electron microscopy (TEM) images revealed the formation of a poly(TEGDMA) layer surrounding the rubber molecules, creating a nanomatrix structure.