Ambient Cross-linking System Based on the Knoevenagel Condensation Reaction between Acetoacetylated Sucrose and Aromatic Dicarboxaldehydes
Ambient Cross-linking System Based on the Knoevenagel Condensation Reaction between Acetoacetylated Sucrose and Aromatic Dicarboxaldehydes
复制标题
基于乙酰乙酰化蔗糖与芳香族二醛Knoevenagel缩合反应的常温交联体系
DOI：
10.1021/acsomega.9b03029
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发表时间：
2019-12-10
期刊：
影响因子：
4.1
通讯作者：
Shen, Liang
中科院分区：
文献类型：
--
作者：
Cao, Zhiyuan;Gao, Fei;Shen, Liang
基于乙酰乙酰化蔗糖与芳香二醛之间的Knoevenagel缩合反应，证明了室温交联体系。在这项研究中，我们使用流变仪来测量凝胶时间，以预测和阐明可能的反应机制的系统，我们制备薄膜的基础上的机械结果。以乙酰乙酰化蔗糖和4，4 ′-联苯二甲醛为原料，哌啶为催化剂，非挥发性二甲基亚砜（DMSO）为溶剂。将4，4 ′-联苯二甲醛和哌啶混合30 min后，加入乙酰乙酰化蔗糖，从而产生最短的凝胶时间。采用傅里叶变换红外光谱对凝胶进行了表征。此外，通过这种方法制备了三种不同的芳香二甲醛的薄膜，并通过差示扫描量热仪，动态力学分析，热重分析和溶胀比的涂层的性能进行了表征。结果发现，这些膜具有高的杨氏模量，高的玻璃化转变温度，高铅笔硬度，和低的溶胀比。
An ambient cross-linking system based on the Knoevenagel condensation reaction between acetoacetylated sucrose and aromatic dicarboxaldehydes was demonstrated. In this study, we use a rheological instrument to measure the gel time to predict and elucidate the likely reaction mechanism of the system, and we prepare films based on the mechanistic results. Acetoacetylated sucrose and 4,4′-biphenyldicarboxaldehyde were used as raw materials, piperidine was used as the catalyst, and nonvolatile dimethyl sulfoxide (DMSO) was used as the solvent. After mixing 4,4′-biphenyldicarboxaldehyde and piperidine for 30 min, the acetoacetylated sucrose was added, thus producing the shortest gel time. Then, the gel was characterized by Fourier transform infrared spectroscopy. In addition, three films were prepared by this approach with different aromatic dicarboxaldehydes, and the properties of the coatings were characterized by differential scanning calorimeter, dynamic mechanical analysis thermogravimetric analysis, and swelling ratio. It was found that these films have high Young’s modulus, high glass transition temperatures, high pencil hardnesses, and low swelling ratios.