Scholarlink

<p>This study investigated the graft copolymerization of 2-(dimethylamino)ethyl methacrylate (DMAEMA) onto deproteinized natural rubber (DPNR) using an emulsion system. The grafting reaction employed a redox initiator system consisting of tetraethylenepentaamine (TEPA) and <i>tert</i>-butyl hydroperoxide (TBHPO), with DMAEMA concentrations of 0.5 and 1.0&#xa0;mol/kg rubber. The resulting graft copolymers were characterized using nuclear magnetic resonance (NMR) spectroscopy, differential scanning calorimetry (DSC), and tensile testing. NMR analysis confirmed the presence of poly(DMAEMA) signals both before and after water extraction, allowing determination of conversion, grafting efficiency, and monomer content through signal intensity measurements. DSC analysis revealed a minor shift in glass transition temperature (<i>T</i><sub><i>g</i></sub>) from − 65.9&#xa0;°C for pure DPNR to -67.6&#xa0;°C for DPNR-<i>graft</i>-poly(DMAEMA), accompanied by the emergence of a melting peak at 103.6&#xa0;°C characteristic of poly(DMAEMA). Following vulcanization, the DPNR-<i>graft-</i>poly(DMAEMA) sample containing 1.0&#xa0;mol DMAEMA/kg-rubber demonstrated superior mechanical properties, achieving a tensile strength of 26.59&#xa0;MPa - higher than both unmodified DPNR and the DPNR-<i>graft</i>-poly(DMAEMA) sample containing 0.5&#xa0;mol DMAEMA/kg-rubber. Furthermore, DMAEMA incorporation enhanced zinc oxide dispersion throughout the rubber matrix, thereby improving vulcanization efficiency.</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

Graft copolymerization of 2-(dimethylamino)ethyl methacrylate onto natural rubber and its effect on vulcanization of natural rubber

  • 期刊论文

  • 发表日期：

    2025年10月25日

查看全文
  • Nghiem Thi Thuong,
  • Nguyen Thanh Long,
  • Phan Trung Nghia,
  • Nguyen Pham Duy Linh,
  • Nguyen Ba Lam,
  • Seiichi Kawahara

摘要

This study investigated the graft copolymerization of 2-(dimethylamino)ethyl methacrylate (DMAEMA) onto deproteinized natural rubber (DPNR) using an emulsion system. The grafting reaction employed a redox initiator system consisting of tetraethylenepentaamine (TEPA) and tert-butyl hydroperoxide (TBHPO), with DMAEMA concentrations of 0.5 and 1.0 mol/kg rubber. The resulting graft copolymers were characterized using nuclear magnetic resonance (NMR) spectroscopy, differential scanning calorimetry (DSC), and tensile testing. NMR analysis confirmed the presence of poly(DMAEMA) signals both before and after water extraction, allowing determination of conversion, grafting efficiency, and monomer content through signal intensity measurements. DSC analysis revealed a minor shift in glass transition temperature (Tg) from − 65.9 °C for pure DPNR to -67.6 °C for DPNR-graft-poly(DMAEMA), accompanied by the emergence of a melting peak at 103.6 °C characteristic of poly(DMAEMA). Following vulcanization, the DPNR-graft-poly(DMAEMA) sample containing 1.0 mol DMAEMA/kg-rubber demonstrated superior mechanical properties, achieving a tensile strength of 26.59 MPa - higher than both unmodified DPNR and the DPNR-graft-poly(DMAEMA) sample containing 0.5 mol DMAEMA/kg-rubber. Furthermore, DMAEMA incorporation enhanced zinc oxide dispersion throughout the rubber matrix, thereby improving vulcanization efficiency.