Accession Number:

ADA191424

Title:

Nanosecond Laser Photolysis of Opaque Heterogeneous Photosensitizers.

Descriptive Note:

Periodic rept. no. 6,

Corporate Author:

LOUGHBOROUGH UNIV OF TECHNOLOGY (UNITED KINGDOM)

Personal Author(s):

• Wilkinson, F.

Report Date:

1987-10-01

Pagination or Media Count:

5.0

Abstract:

Work continues on studies of photophysical and photochemical properties of benzoylated polystyrene polymer-bound benzophenone. We are able to establish the presence of two transients when these samples are subjected to laser flash photolysis exciting at 354 nm, from the time dependent decrease in diffuse reflectance at different analysing wavelengths. One of these transients is the triplet state of the polymer bound benzophenone which can also be studied in emission which we have been able to do. The other is probably the radical formed by hydrogen abstraction by this triplet state by those photo excited species which are close enough to methylene groups to allow reaction.

Descriptors:

• *LASERS
• *PHOTOLYSIS
• *POLYSTYRENE
• BENZOPHENONES
• DIFFUSE REFLECTION
• FLASHES
• HETEROGENEITY
• HYDROGEN
• METHYLENES
• OPACITY
• PHOTOCHEMICAL REACTIONS
• PHOTOGRAPHS
• PHOTOSENSITIVITY
• POLYMERS
• TRANSIENTS

Subject Categories:

• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE