Photoinduced nucleation in supersaturated isoprene vapor: The mechanism of photopolymerization

Autor:	M. S. El‐Shall, M. H. Rabeony, H. Reiss
Rok vydání:	1989
Předmět:	Supersaturation Chemistry Diffusion Photodissociation Nucleation General Physics and Astronomy Photochemistry law.invention chemistry.chemical_compound Photopolymer Polymerization law Physical and Theoretical Chemistry Cloud chamber Isoprene
Zdroj:	The Journal of Chemical Physics. 91:7925-7935
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.457209
Popis:	Homogeneous nucleation and photochemical polymerization in supersaturated isoprene vapor were investigated using a diffusion cloud chamber. The mechanism of photoinitiation appears to involve the photolysis of a volatile product which results from the primary photodecomposition process. The photonucleation results from direct propagation as well as recombination of polymer molecules. At very low supersaturation ratio (e.g., 1.2), recombinative termination becomes the only possible way to achieve the tunable size required for the nucleation. A nonsteady state experiment allows us to resolve the nucleation spectrum into contributions due to polymers resulting from recombination and those due to direct propagation.
Databáze:	OpenAIRE
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