SynopsisFurfuryl alcohol resins contain a broad spectrum of compounds. The distribution of these compounds in a given resin varies with the manufacturing conditions. A resin containing a high proportion of low molecular weight constituents has been prepared and separated into fractions. Twelve compounds were separated from the resin; four of these are new compounds. The lower molecular weight constituents can be arranged into four major classes: polyfurfuryl alcohols, polyfurfuryl furans, methyl-substituted polyfurfuryl furans, and polyfurfuryl ethers.
The liquidus, solidus, and subsolidus of the system CaO–MgO have been redetermined. X‐ray diffraction and optical techniques show that the maximum solid solution of MgO in the CaO lattice is approximately 17 wt% at 2370°C and the maximum solid solution of CaO in the MgO lattice is approximately 7.8 wt% at 2370°C. The extent of solid solution in each case is substantially greater than previously reported. Magnesium oxide and calcium oxide solid solutions exist at temperatures above 1600°C. The liquidus values closely agree with those previously reported by Rankin and Merwin.
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