Die Makromolekulare Chemie · 1970 · 30 citations · 12 references
Natural SciencesChemical EngineeringChemistryPhysical ChemistryPolymer ChemistryThermodynamicsPolymer CharacterizationPolymer Physical ChemistryPolymer PhysicsPolymer ProcessingPolymer ThermodynamicsPolymerization ChemistryEquilibriumFormaldehydeFree Energy ChangesGas-phase ReactionsImpuritiesPolymer EnthalpyPolymerization ThermodynamicsThermal Properties
Abstract The equilibrium between gaseous formaldehyde and highly crystalline polyformaldehyde in the presence of gaseous cationic initiators has been investigated. For the first time in such experiments the constitution of the gas phase has been closely investigated. Quantitative estimation of the two major impurities, methyl formate and trioxan, in equilibrium experiments in the temperature range 325 to 368°K has given true values of the equilibrium partial pressure of formaldehyde. The results have yielded the following thermodynamic values for the polymerisation of formaldehyde: and for the polymerisation of solid trioxan to crystalline polyformaldehyde: The free energy of polymerisation of solid trioxan is thus negative at all temperatures as is that of tetroxan.
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Thermodynamic functions of linear high polymersPart I—polyoxymethylene
F. S. Dainton, Deborah G. Evans, F. E. Hoare et al. · Polymer · 1962 · 179 citations