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A structural study of epoxidized natural rubber (ENR-50) ring opening under mild acidic condition

机译:弱酸性条件下环氧化天然橡胶(ENR-50)开环的结构研究

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A structural study of ring opening reaction of purified epoxidized natural rubber (ENR) with acetic acid was conducted using the NMR techniques and its thermal characteristic was evaluated with Thermal gravimetry/Differential Thermal Gravimetry (TG/DTG) and Differential Scanning Calorimetry (DSC) analyses. H-1-NMR revealed that 19.56% of epoxide was ring-opened from the total amount of the epoxide unit in ENR-50 and this was supported by Fourier Transform Infrared (FTIR) spectroscopy. C-13-NMR suggests the fixation of alkyl (R) i.e., acetate group to the epoxide carbon via ester linkage and formation of hydroxyl groups in the polymer chains. The attachment location of R occurred at both most () and least () hindered carbons of the epoxide. The TG/DTG results of acid treated ENR-50 showed three decomposition steps at 235-338, 338-523, 523-627 degrees C due to the presence of the polymer chains mixture, i.e., ring-opened and intact epoxide of ENR-50. This increases the T-g value of acid treated ENR-50 at 24.6 degrees C as compared to purified ENR-50 at -17.7 degrees C. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44123.
机译:使用NMR技术进行了纯化的环氧化天然橡胶(ENR)与乙酸的开环反应的结构研究,并通过热重分析/差示热重分析(TG / DTG)和差示扫描量热法(DSC)分析了其热特性。 。 H-1-NMR表明,从ENR-50中的环氧化物单元的总量中,环氧化物的开环为19.56%,这由傅立叶变换红外光谱(FTIR)支持。 C 13 -NMR表明,烷基(R)即乙酸酯基通过酯键固定并在聚合物链中形成羟基而固定在环氧碳上。 R的附接位置在最多()和最少()的环氧化物的受阻碳上都发生。酸处理过的ENR-50的TG / DTG结果表明,由于存在聚合物链混合物(即ENR-的开环和完整的环氧化物),在235-338、338-523、523-627摄氏度下显示了三个分解步骤。 50与在-17.7℃下纯化的ENR-50相比,在24.6℃下酸处理的ENR-50的T-g值增加。(c)2016 Wiley Periodicals,Inc. J. Appl。 Polym。科学2016,133,44123。

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