Vapor Pressure, Decomposition , and Temperature
Vapor Pressure, Decomposition , and Temperature
(OP)
Does anyone know of any liquid that when heated increses its vapor pressure, but while being heated decomposes to another chemical, and then starts reducing its vapor pressure?
i.e. Vapor pressure would increase and suddenly or gradually decrease with temperature due to heat decomposition?
i.e. Vapor pressure would increase and suddenly or gradually decrease with temperature due to heat decomposition?





RE: Vapor Pressure, Decomposition , and Temperature
RE: Vapor Pressure, Decomposition , and Temperature
RE: Vapor Pressure, Decomposition , and Temperature
RE: Vapor Pressure, Decomposition , and Temperature
RE: Vapor Pressure, Decomposition , and Temperature
RE: Vapor Pressure, Decomposition , and Temperature
Polymerization reaction takes many molecules and makes one really big molecule
So something like vinyl chloride monomer or styrene would have increasing vapor pressure with increasing temperature. Then would rapidly polymerize giving off large amounts of heat. Then you would a blob of polymer with a significantly lower vp than the monomer you started with.
RE: Vapor Pressure, Decomposition , and Temperature
1) What temperature does it polymerize to ploystyrene?
2) What is the vapor pressure of styrene prior to polymerization?
3) What is the vapor pressure of polystyrene just after polymerization?
If someone has a plot or reference, that would be great. Or point me to a place where I can find this info. I'm having a hard time finding information for these materials outside of NTP/STP
RE: Vapor Pressure, Decomposition , and Temperature
Vapor pressure, in Pa, of styrene, following Perry's Chem. Eng. Handbook, 8th Ed., McGraw-Hill:
C1 = 105.93
C2 = -8685.9
C3 = -12.42
C4 = 7.5583 E-06
C5 = 2
between Tmin = 242.54 K (melting point) and Tmax = 636 K.
P at Tmin = 10.6
P at Tmax = 3.823 E+06
Perry also gives a table of vapor pressures in mm Hg between 1mm and 760 mm Hg.
Left alone at room temperature, styrene will eventually polymerize with itself to a clear glassy solid. Technical grade styrene is 99% minimum purity. It is shipped with a polymerization inhibitor in it, in standard tank cars or trucks.