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- W1999231623 abstract "Self-thermal initiated gas phase polymerization in styrene vapor is investigated employing the nucleation and growth of liquid monomer droplets (in supersaturated styrene vapor) for detection. The results show rather definitively that styrene does polymerize thermally, in the vapor phase, at temperatures as low as 250 K. The same is true for α-methylstyrene which is also studied (but not so thoroughly). Phenylacetylene retards the gas phase polymerization of styrene. Polymers with degree of polymerization in the range 9 to 24 are involved in this study. The degree of polymerization increases with temperature and bimolecular termination appears to be absent. The total concentration of growing radicals is of the order of 6×103 cm−3. Thermal initiation appears to have second order kinetics. The rate constant for propagation is the same in the gas as in the liquid. At 0 °C (where we easily observe the formation of polymers), 23 million years would be required to observe the disappearance of monomer by standard methods. This explains why gas phase polymerization of styrene has not been previously conclusively demonstrated, even at high temperatures." @default.
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- W1999231623 date "1987-07-15" @default.
- W1999231623 modified "2023-10-13" @default.
- W1999231623 title "Homogeneous gas phase thermal polymerization of styrene" @default.
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- W1999231623 doi "https://doi.org/10.1063/1.453315" @default.
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