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Heterogeneous photosensitization—IV. The structure and properties of benzaldehyde photopolymer

Authors
Journal
European Polymer Journal
0014-3057
Publisher
Elsevier
Publication Date
Volume
17
Issue
3
Identifiers
DOI: 10.1016/0014-3057(81)90170-1

Abstract

Abstract The basic structure of benzaldehyde photopolymer (BPOL) consists of phenyl groups attached to a carbon-carbon and carbon-oxygen chain. The average BPOL molecule contains 12 monomer units. Relative rates for the BPOL photosensitized dimerization of 1,3-cyclohexadiene and the isomerizations of the 1,3-pentadienes, cis-1,2-dichloroethylene and cis-2-butene are reported. The BPOL photosensitized isomerizations of the 1,3-pentadienes in the visible ( λ > 395 nm) proceed by a simple mechanism. Stern-Volmer plots are linear and the photostationary trans/cis ratio is 2.0, independent of 1,3-pentadiene pressure over the range 2–180 Torr. The energy of the BPOL triplet state is less than but near 53 kcal mol −1. It excites the s- cis 1,3-pentadiene rotamers exclusively. The decay ratio of the s- cis triplets is 3.75.

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