Scaling law for the dissolution of phenolic resins in aqueous base

摘要

Abstract: A scaling law derived from percolation theory for the dissolution of phenolic resins in aqueous base is tested and confirmed on seven groups of amphiphilic resins. The scaling law can be presented in the dimensionless form: log(R/R$-1$/) $EQ 2 log$LB@(p $MIN p$-c$/)/(1 $MIN p$-c$/)$RB@. Here R and R$-1$/ are the dissolution rates of the resin and of a standard resin for which p $EQ 1, the percolation parameter, p, linked to the concentration of hydrophilic sites (OH-groups) in the material, and p$-c$/ is the percolation threshold below which dissolution no longer occurs. In the group of resins of this study P$-c$/ $EQ 0.20. In its dimensionless form the scaling law provides a single function which applies to all resins of this study and, we believe, to amphiphilic resins in general. This allows the prediction of dissolution rates and the selection of polymer structures which are likely to have specified dissolution kinetics. !15