Abstract The ring-opening reactions (ROR) of epoxide groups in epoxidized natural rubber/titania (ENR-50/TiO 2 ) hybrid in potassium hydroxide/isopropanol medium were examined using NMR spectroscopy and supported by the FTIR technique. The thermal behaviour of the hybrid was also studied using TG/DTG and DSC analyses. The 1 H NMR results suggested that 16.82% of ROR occurred in the hybrid, while the 13 C NMR results exhibited five new peaks at δ 19.5, 71.0, 73.7, 91.7 and 94.4 ppm in the hybrid. 2D NMR, such as HMQC, HMBC and COSY techniques, further scrutinized these assignments. The FTIR spectrum exhibited Ti-O-C characteristics via the peak at 1028 cm −1 . The TG/DTG results showed four steps of thermal degradation at 44–148, 219–309, 331–489 and 629–810 °C due to the existence of Ti moieties along with a polymer chain mixture (intact and ring-opened epoxide groups) of ENR-50, which in turn led to an increase in the T g value of the hybrid to 27 °C compared to that of purified ENR-50 at −17.72 °C.

中文翻译：

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核磁共振谱揭示 KOH/C 3 H 8 O 介质中 ENR-50/TiO 2 杂化物的结构方面的见解

摘要 使用核磁共振光谱和FTIR 技术研究了环氧化天然橡胶/二氧化钛(ENR-50/TiO 2 ) 杂化物中环氧基团在氢氧化钾/异丙醇介质中的开环反应(ROR)。还使用 TG/DTG 和 DSC 分析研究了混合体的热行为。1 H NMR 结果表明杂化中出现了 16.82% 的 ROR，而 13 C NMR 结果在杂化中 δ 19.5、71.0、73.7、91.7 和 94.4 ppm 处显示了五个新峰。2D NMR，例如 HMQC、HMBC 和 COZY 技术，进一步检查了这些分配。FTIR 光谱通过 1028 cm -1 处的峰表现出 Ti-OC 特性。TG/DTG 结果显示在 44-148、219-309、