单宁酸(TA)与l -赖氨酸二异氰酸酯(LDI)体系反应动力学分析

IF 3.4 4区 化学 Q2 POLYMER SCIENCE
Ali Karbasi, Reza Darvishi, AmirHossein Enayati Gerdroodbar, Ghasem Payam
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引用次数: 0

摘要

采用差示扫描量热法(DSC)和动态流变学试验研究了单宁酸(TA)与l -赖氨酸二异氰酸酯(LDI)反应合成绿色聚氨酯的动力学。在非等温条件下,在5、10、15和20°C/min的动态加热速率下,对制备的样品的反应行为进行了评价。通过Ozawa-Flynn-Wall和Kissinger-Akahira-Sunose (KAS)、Ozawa-Flynn-Wall方法(OFW)、Friedman (FR)、Starink和Vyazovkin五种等转换方法计算了活化能随转换的演化。这些方法计算的平均活化能分别为46.5、46.8、47.2、47.3和51.4 KJ/mol。指数前因子以1/s计算。总的反应阶数()也在1.8912左右。无模型法和模型拟合相结合的结果表明,反应机理为自催化型,表明反应过程中形成的氨基具有自催化作用。所得的TA/LDI动力学与实验数据吻合较好。等温流变试验结果表明,随着温度的升高,胶凝时间缩短。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kinetic Analysis of the Reaction between Tannic Acid (TA) and L-Lysine Diisocyanate (LDI) Systems
The kinetics of the synthesis of green polyurethane from the reaction between tannic acid (TA) and L-lysine diisocyanate (LDI) were investigated using the differential scanning calorimeter (DSC) technique and dynamic rheological tests. The evaluation of the reaction behavior of the prepared samples was carried out using nonisothermal conditions at dynamic heating rates of 5, 10, 15, and 20°C/min. The evolution of the activation energy with conversion was computed through the five isoconversional methods of Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose (KAS), the Ozawa-Flynn-Wall method (OFW), Friedman (FR), Starink, and Vyazovkin. The average activation energy calculated from these methods was estimated at 46.5, 46.8, 47.2, 47.3, and 51.4 KJ/mol, respectively. The preexponential factor was evaluated at 1/s. The overall reaction order () was also found to be around 1.8912. The results of the combination of the model-free method and model-fitting approach exhibited that the reaction mechanism was an autocatalytic type, implying the autocatalytic effect of the urethane groups formed during the reaction. The obtained kinetic for TA/LDI was verified through its good agreement with the experimental data. Moreover, the results found from the isothermal rheological test show that with increasing temperature, the gelation time decreases.
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来源期刊
CiteScore
6.10
自引率
0.00%
发文量
55
审稿时长
>12 weeks
期刊介绍: The International Journal of Polymer Science is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles on the chemistry and physics of macromolecules.
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