Synthesis, thermal stability, and degradation kinetics of a novel boron-containing novolac based on triphenyl borate

IF 1.5 4区化学 Q4 CHEMISTRY, PHYSICAL International Journal of Chemical Kinetics Pub Date : 2024-03-08 DOI:10.1002/kin.21713

Shijun Huang, Suyu Zhai, Wenzhong Lai, Kai Chen, Wangchuan Xiao, Jiwei Chen, Jida Bu

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Abstract

A novel boron-containing novolac (triphenyl borate-formaldehyde resin, TPBF) was synthesized. The structure, thermoplasticity, molecular weight, and molecular weight distribution of TPBF have been characterized with FT-IR, melt viscosity, ¹³C NMR and GPC. The thermal stability of TPBF was investigated by TGA, indicating the thermal stability of TPBF was much better than that of normal novolac (phenol-formaldehyde resin, PF). TPBFs with different molar ratios of formaldehyde to benzene ring in triphenyl borate (TPB) were also synthesized and compared for molecular size, polydispersity and thermal stability. Further, the thermal degradation kinetics of TPBFs and PF were studied by TGA using Madhusdanan-Krishnan-Ninan method and the activation energies were calculated at different degradation stages. It was found that the thermal degradations of TPBFs and PF are a multistage reaction and the degradation reactions in every stage follow the first order reaction mechanism. Finally, the activation energies of thermal degradations of novolac increase with the introduction of boron, the progress of degradation reaction as well as the increase of molar ratios.

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基于硼酸三苯酯的新型含硼酚醛的合成、热稳定性和降解动力学

合成了一种新型含硼酚醛树脂（三苯基硼酸甲醛树脂，TPBF）。利用傅立叶变换红外光谱、熔融粘度、13C NMR 和 GPC 对 TPBF 的结构、热塑性、分子量和分子量分布进行了表征。通过 TGA 研究了 TPBF 的热稳定性，结果表明 TPBF 的热稳定性远远优于普通酚醛树脂。此外，还合成了硼酸三苯酯（TPB）中不同甲醛与苯环摩尔比的 TPBF，并对其分子大小、多分散性和热稳定性进行了比较。此外，还采用 Madhusdanan-Krishnan-Ninan 法通过热重分析研究了 TPBFs 和 PF 的热降解动力学，并计算了不同降解阶段的活化能。研究发现，TPBFs 和 PF 的热降解是一个多阶段反应，每个阶段的降解反应都遵循一阶反应机理。最后，酚醛的热降解活化能随着硼的引入、降解反应的进展以及摩尔比的增加而增加。

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来源期刊

International Journal of Chemical Kinetics 化学-物理化学

CiteScore

3.30

自引率

6.70%

发文量

审稿时长

3 months

期刊介绍： As the leading archival journal devoted exclusively to chemical kinetics, the International Journal of Chemical Kinetics publishes original research in gas phase, condensed phase, and polymer reaction kinetics, as well as biochemical and surface kinetics. The Journal seeks to be the primary archive for careful experimental measurements of reaction kinetics, in both simple and complex systems. The Journal also presents new developments in applied theoretical kinetics and publishes large kinetic models, and the algorithms and estimates used in these models. These include methods for handling the large reaction networks important in biochemistry, catalysis, and free radical chemistry. In addition, the Journal explores such topics as the quantitative relationships between molecular structure and chemical reactivity, organic/inorganic chemistry and reaction mechanisms, and the reactive chemistry at interfaces.

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