개량된 요소 수지의 열적 특성 분석

Wei Hong; Mianwu Meng; Dingding Gao; Qingye Liu; Caiyan Kang; Siyu Huang; Zhenming Zhou; Chunqiang Chen

Polymer(Korea), Vol.40, No.5, 707-713, September, 2016

DOI10.7317/pk.2016.40.5.707 Export Citation

개량된 요소 수지의 열적 특성 분석

Thermal Analysis Study of Modified Urea-Formaldehyde Resin

Wei Hong^†, Mianwu Meng, Dingding Gao, Qingye Liu, Caiyan Kang, Siyu Huang, Zhenming Zhou, and Chunqiang Chen

Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology College of Environment and Resources, Guangxi Normal University, Guilin 541004, China

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In this study, the structures and thermal stability of pure urea-formaldehyde resin (PR) and modified urea-formaldehyde (UF) resin are investigated by differential thermal gravity (TG/DTG), and differential scanning calorimetry (DSC) supported by data from Fourier transform infrared spectroscopy. FTIR analysis indicate that the modifiers such as polydimethylsiloxane, dicyclohexylcarbodiimide and phenol have actively participated in the curing reactions. TG/DTG and DSC curve of UF resin show that its pyrolysis process is conducted in three steps: desiccation and dehydration, flash pyrolysis and slow decomposition. Compared with pure urea-formaldehyde resin (PR), modified UF resin exhibited good thermal stability. The activation energy (E) of modified UF resin acquired by Kissinger and Ozawa method was higher than that of PR. ΔH > 0, ΔS > 0 and ΔG > 0 in the thermal decomposition process of UF resin means that the decomposition reaction of UF resin before and after modification is a process of unnatural decalescence and entropy increase.

Keywords:modified UF resin;thermal properties;TG/DTG;thermodynamics;thermal decomposition kinetics

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