PREPARATION OF AROMATIC POLYURETHANE AND POLYESTER BY HIGH-TEMPERATURE VAPOR-DEPOSITION POLYMERIZATION

We discussed the film formation step in vapor deposition polymerizatio n thermodynamically in this report. Enthalpy of vaporization of monome rs (Delta N=10 similar to 30 kcal/mol) were measured from the plots of saturated vapor pressure as a function of reciprocal temperature. The y were then compared with the activation energy (1 similar to 25 kcal/ mol) between the monomers in solution. It is found that when the total enthalpy of vaporization of both the monomers is much larger than the activation energy, the polymers can be synthesized by the vapor depos ition polymerization. Using this knowledge, an aromatic polyurethane a nd polyester were prepared for the first time by high temperature vapo r deposition polymerization.