Monomeric formaldehyde Properties

Monomer emulsion preparation, 76 286 Monomeric formaldehyde, properties of, 72 108t... 

The properties of chloromethyl chloroformate which has been made also by phosgenation of monomeric formaldehyde (Ref. 29), are discussed further in section 3-2-2. 

Features Monomeric < 0.1% free formaldehyde Properties APHA 30 max. color dens. 9.9-10.1 Ib/gal vise. (Gardner-Holdt) Y-Z2 flash pt. (PMCC) > 110 C 98% min. solids Resimene U-901 [Solutia]... 

The thermal destruction of polyformaldehyde with acetylated terminal groups was conducted on a circulation setup at a temperature of 300°C. Since the basic product of the thermal destruction of polyformaldehyde is monomeric formaldehyde, a successful performance of the analysis necessitated its separation from the other decomposition products, the amounts of which were two to three orders of magnitude smaller than the amount of the formaldehyde formed. For this a method was developed for separating formaldehyde, utilizing its property of spontaneous polymerization to Eu-polyoxymethylene at the temperature of... 

Properties. Gamma-polyox miethylene is a colorless cn stalline product which decompt es on heating in the temperature range 160-210 C. The exact temperature of decomposition depends on the method of preparation and purification. It melts to a clear liquid at approximately 160-180°C. On % aporization, it depolymerizes to monomeric formaldehyde gas. The pohmer does not smell of formaldehyde and is insoluble in water and organic solvents. It is not affected by dilute alkalies, but dissolves with hydrolysis in acidic solutions when heat is appHed. 

The properties and processing characteristics of thermoset polymers can be varied by adjusting the ratio of monomeric reactants. Baekeland developed different products by varying the ratio of phenol to formaldehyde and the nomenclature he used to describe his results is still used today. 

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