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Title
Effect of molar ratio and fillers on creep behavior of phenolformaldehyde and melamine-urea-formaldehyde thermosetting adhesives
Authors
CUI JUQING WANG ZHIQIANG NA BIN HAN SHUGUANG ZHOU XIAOYAN and LU XIAONING
Published
Volume 46 Issue 7-8 September-October
Keywords
creep behavior, phenol-formaldehyde, melamine-urea-formaldehyde, molar ratio, filler
Abstract
This paper investigates the effect of molar ratio and three kinds of fillers (poplar wood flour, wheat flour and glass
particles) on the creep behavior of two thermosetting adhesives used for wood-based panels – phenol-formaldehyde
(PF) and melamine-urea-formaldehyde (MUF) – by dynamic mechanical analysis (DMA). The results obtained indicate
that the ability of high molar ratio PF or MUF adhesives to resist deformation is largely superior to that of low molar
ratio adhesives. In high molar ratio PF and MUF adhesives (P/F=1:2.20 and (M+U)/F=1:2.26), all fillers had a negative
effect on the creep behavior. However, the fillers could markedly improve the creep behavior of PF and MUF adhesives
with low molar ratio (P/F=1:1.98 and (M+U)/F=1:1.50). Moreover, glass particles and poplar wood flour proved to
have a stronger effect, compared to wheat flour. The results obtained provide insights into easy ways to improve the
creep behavior of wood adhesives for structural purposes.
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