Permeation Properties of Copolyimide UF Membrane with Good Thermal Stability

Chae, Doog Wook; Choi, Hyun Kuk; Jeon, Jong Young

doi:10.7317/pk.2016.40.1.154

Cited by 1 publication

(1 citation statement)

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“…[6][7][8][9] The last two kinds are the most widely used approach for studying pyrolytic reaction of thermosetting resin. [10][11][12][13] In most thermal decomposition kinetic research methods, Kissinger's 14 maximum weight-loss rate method and Ozawa's 15 equivalent weight-loss percentage method are applied for dynamic computation via relation between peak temperature and heating rate of DTG and DSC curves, involving no selection of mechanism func-폴리머, 제40권 제5호, 2016년 tion and applying to any reaction order with more reliable result. Therefore, Kissinger and Ozawa method are two kinds of simple but effective thermomechanical analysis method.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis Study of Modified Urea-Formaldehyde Resin

Hong¹,

Meng²,

Gao³

et al. 2016

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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.

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