Water-soluble polymerization initiators based on the thioxanthone structure: a spectroscopic and laser photolysis study

The time-resolved and steady-state photochemical study of a new set of water-soluble initiators of polymerization is reported. The initiators exhibit a bell-shaped dependence of the rate of polymerization as a function of the amine concentration. This unusual shape is accounted for by a concurrent q...

Full description

Saved in:
Bibliographic Details
Published in:Macromolecules 1989-01, Vol.22 (1), p.108-116
Main Authors: Lougnot, D. J, Turck, C, Fouassier, J. P
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Physicochemistry of polymers
Polymerization
Polymers and radiations
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The time-resolved and steady-state photochemical study of a new set of water-soluble initiators of polymerization is reported. The initiators exhibit a bell-shaped dependence of the rate of polymerization as a function of the amine concentration. This unusual shape is accounted for by a concurrent quenching of the singlet and triplet states of the initiator by the cosynergist and a pretty good modelization of the polymerization kinetics is achieved. In addition to the study of the initiation ability of these initiators as a function of several chemical parameters, the question of their photochemical properties (fluorescence and triplet quentum yield, quenching constants by electron donors in the triplet and singlet states, photoreduction quantum yield) is considered with special attention and some structure/reactivity relationships are pointed out. 30 ref.--AA
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00191a022