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Excited state properties of a new photoinitiating system for laser imaging applications (1994)

Morlet-Savary, F. ; Fouassier, J. P. ; Matsumoto, T. ; [et al.]

New York, NY : Wiley-Blackwell

Polymers for Advanced Technologies 5 (1994), S. 56-62

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ISSN: 1042-7147

Keywords: Photoinitiator ; Photopolymerization ; Laser imaging ; Laser spectroscopy ; Photochemistry ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: The design of an efficient photosenzitizer/photoinitiator combination is partly governed by a better understanding of the excited state processes involved. In the present paper, the photochemistry of a thiopyrylium salt (TP) as photosensitizer and of a tetraperester of benzophenone, tetra t-butyl peroxycarbonylbenzophenone (BTTB) as initiator, used in laser imaging applications has been investigated. The reactivity of the triplet states of both compounds BTTB and TP was studied by time-resolved laser absorption spectroscopy. The laser excitation of TP leads to a long-lived triplet state (lifetime 20-25 μsec) and a second species arising from the triplet state which cannot yet be characterized. Under laser excitation, BTTB gives a longlived transient arising from the cleavage of the peroxy bond. The short-lived triplet state cannot be observed on the nanosecond timescale. The triplet state lifetime has been evaluated from quenching experiments and found to be about 1 ns in acetonitrile. The deactivation of the TP triplet state by BTTP was considered, the deactivation constant was found to be equal to 6.6 × 107 m-1/sec in acetonitrile. The initiation mechanism is discussed.

Additional Material: 11 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pat.1994.220050108

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