Resin hydrolysis evidence

Factors to be considered in this paper include (a) the degree to which formaldehyde emission rate from wood systems is controlled by diffusion processes, (b) the contribution of resin hydrolysis to emission rate, and (c) the contribution of formaldehyde-wood states to emission rate. In the following, therefore, I first summarize briefly the reported evidence regarding diffusion control and resin hydrolysis in actual bonded wood products. Thereafter, I present and discuss some of my own recent experiments on wood systems that attempted to shed additional light on the questions of resin hydrolysis and the emission mechanism more generally. 

Literature Evidence for Resin Hydrolysis in Actual Boards... 

Despite the rather massive literature on formaldehyde emission from UF-bonded wood products, evidence for a direct causal relationship between resin hydrolysis and formaldehyde emission from bonded products is almost nonexistent. Indeed, evidence in the literature that UF resin hydrolysis actually does occur in a board arises primarily from studies into the question of whether the limited durability of UF-bonded wood products is caused by resin hydrolysis or by a particular susceptibility of UF resin-wood bonds to rupture from swelling/shrinkage stresses. 

Evidence for Resin Hydrolysis. That UF resin hydrolysis can occur in boards is strongly indicated by the following ... 

It is evidently not possible to prepare the ((u-oxoalkyl)-phosphonic (519 R = R O) or -phosphinic diesters through direct reaction between a phosphorus(III) ester and an co-haloalkanal. However, the corresponding acetals (520 = 1 or 2) are readily available in this way precautions have to be taken to avoid overheating which can result in the loss of ethanol (when n - ) and the formation of the enol ether 521, a process which becomes more prevalent in the synthesis of the secondary compounds 522 Gentle hydrolysis of the acetals 520, using very dilute or an ion-exchange resin in the... 

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