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Journal of Adhesion Science and Technology Volume 30, 2016 - Issue 24
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Articles

Urea–formaldehyde resin prepared with concentrated formaldehyde

Zhigang WuYunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, P. R. China
,
Hong LeiYunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, P. R. ChinaCorrespondence[email protected]
,
Guanben DuYunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, P. R. China
,
Ming CaoYunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, P. R. China
,
Xuedong XiYunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, P. R. China
&
Jiankun LiangYunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, P. R. China
Pages 2655-2666 | Received 25 Sep 2015, Accepted 20 May 2016, Published online: 05 Jun 2016
 
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Abstract

The characteristics of UF resin prepared with concentrated formaldehyde were studied in this paper. With the molar ratio F/U = 1.1, the UF resin prepared with concentrated formaldehyde showed better mechanical properties than that with formalin. The 13C-NMR and FTIR results indicated that there were more methylene groups, ether groups and urons in a UF resin system prepared with concentrated formaldehyde than those in a normal UF resin. The differential scanning calorimetry and DMA results showed that the curing temperature of UF resin with concentrated formaldehyde was lower than that of a normal UF resin. UF resin with concentrated formaldehyde showed worse thermal stability and higher thermal decomposition temperature.

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