Photopolymerization of Thin Polycrystalline Diacetylene Films and Quenching of the Precursor Excited State | Zendy

S. Spagnoli | Zendy; JeanLouis Fave | Zendy; Michel Schott | Zendy

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Photopolymerization of Thin Polycrystalline Diacetylene Films and Quenching of the Precursor Excited State

Author(s) -

S. Spagnoli,

JeanLouis Fave,

Michel Schott

Publication year - 2011

Publication title -

macromolecules

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.994

H-Index - 313

eISSN - 1520-5835

pISSN - 0024-9297

DOI - 10.1021/ma102968w

Subject(s) - diacetylene , photopolymer , polymerization , kinetics , monomer , photochemistry , quenching (fluorescence) , excited state , microcrystalline , polymer , absorbance , thin film , chemistry , polymer chemistry , materials science , optics , organic chemistry , nanotechnology , crystallography , fluorescence , atomic physics , physics , quantum mechanics , chromatography

International audienceMicrocrystalline films of the diacetylenes 4BCMU and 3BCMU were prepared by vacuum evaporation and polymerized by UV irradiation. A method for determining the absolute polymer content X in films has been developed. In 4BCMU the reaction rate is strongly decreased beyond X similar to 0.3. Existing models fail to fit the kinetics. A numerical model based on quenching of the monomer excited state, the initiation precursor, by energy transfer to a nearby existing chain is developed and quantitatively fits the kinetics. Such quenching may occur in any diacetylene solid, so that one should not assume that an apparent saturation of the absorbance of a film corresponds to complete polymerization. 3BCMU is less reactive and briefly compared to 4BCMU

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