Abstract
Three new structures (S-benzoyl O-ethyl xanthate, benzoyl diethyldithiocarbamate, and benzyl 9H-carbazole-9-carbodithioate) are proposed as photoiniferters for controlled photopolymerization reactions. They are more efficient than the reference compound—benzyl dimethyldithiocarbamate—for both the polymerization rates of an acrylic difunctional monomer and the final control properties of the MMA photopolymerization (polydispersity PDI = Mw/Mn and/or number-average molecular weight Mn ranges). The best results are obtained with benzyl 9H-carbazole-9-carbodithioate (PDI = 1.14 at 10% conversion and 1.5 at 40%; Mn = 16 000 at 20% conversion). Transient radical absorptions were recorded and the interaction rate constants with MMA and oxygen measured by laser flash photolysis. Quantum mechanical calculations show that the singly occupied molecular orbital delocalization is higher for the carbazole derivative. The significant improvement of the control mechanism by benzyl 9H-carbazole-9-carbodithioate is due to ...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
