Lu Tingting, Zhao Baodong, Liu Yajing, Yan Zhengfeng, Wang Yinglei, Fu Xiaolong, Yan Qi-Long
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an 710065, China.
Dalton Trans. 2021 Dec 7;50(47):17766-17773. doi: 10.1039/d1dt03305k.
The surface functionalization of graphene oxide (GO) is always attractive in improving certain properties of the polymer. In this study, 3-aminopropyltriethoxysilane (APTES) and 3-mercaptopropyl-trimethoxysilane (SPTES) have been used to make silane functionalized graphene oxides (SiGOs). The APTES-grafted GO (NH-SiGO), SPTES-grafted GO (SH-SiGO) and pure GO have been separately introduced into the nitrocellulose (NC) matrix. The morphology, thermal properties and energetic properties of the prepared nanocomposites (NH-SiGO and SH-SiGO) were investigated comprehensively. It is shown that the presence of GO and SiGOs have different influences on the thermal reactivity of NC with various contents, and NH-SiGO with 0.5 wt% content showed better catalytic performance on the thermal decomposition of NC than others and showed prominently higher efficiency in improving its heat of combustion. Adding 0.5 wt% of NH-SiGO to NC may decrease its decomposition temperature from 202.1 °C to 196.6 °C, and the residue was decreased from 10.61 wt% to 3.95 wt%, respectively. One isoconversional kinetic method was exploited to determine the kinetic parameters of NC and its nanocomposites. It was found that NH-SiGO had a strong catalytic action on the thermal decomposition of NC-based nanocomposites for which the activation energy and the pre-exponential factor were considerably lowered, while SH-SiGO exhibited an inverse effect. The heat of combustion from NC/GO/0.5, NC/NH-SiGO/0.5 and NC/SH-SiGO/0.5 were determined as 11 249.5, 11 675.1 and 11 491.5 J g, respectively, which are higher than that of the pure NC (10 908.4 J g). From the combustion process of NC/NH-SiGO/0.5, it was shown that the nanocomposite was combusted completely.
氧化石墨烯（GO）的表面功能化在改善聚合物的某些性能方面一直具有吸引力。在本研究中，3-氨丙基三乙氧基硅烷（APTES）和3-巯基丙基三甲氧基硅烷（SPTES）被用于制备硅烷功能化氧化石墨烯（SiGOs）。已将APTES接枝的GO（NH-SiGO）、SPTES接枝的GO（SH-SiGO）和纯GO分别引入硝化纤维素（NC）基体中。对制备的纳米复合材料（NH-SiGO和SH-SiGO）的形态、热性能和能量性能进行了全面研究。结果表明，GO和SiGOs的存在对不同含量的NC的热反应性有不同影响，含量为0.5 wt%的NH-SiGO对NC热分解的催化性能优于其他材料，并且在提高其燃烧热方面表现出显著更高的效率。向NC中添加0.5 wt%的NH-SiGO可能会使其分解温度从202.1℃降至196.6℃，残渣率分别从10.61 wt%降至3.95 wt%。采用一种等转化率动力学方法来确定NC及其纳米复合材料的动力学参数。发现NH-SiGO对基于NC的纳米复合材料的热分解具有强烈的催化作用，其活化能和指前因子显著降低，而SH-SiGO则表现出相反的效果。NC/GO/0.5、NC/NH-SiGO/0.5和NC/SH-SiGO/0.5的燃烧热分别测定为11249.5、11675.1和11491.5 J/g，均高于纯NC（10908.4 J/g）。从NC/NH-SiGO/0.5的燃烧过程可以看出，该纳米复合材料完全燃烧。
