Simultaneous initiation of radical and cationic polymerization reactions using the "G1" copper complex as photoredox catalyst: Applications of free radical/cationic hybrid photopolymerization in the composites and

WOS:000469902800007This investigation presents the use of a photoredox catalyst "G1" as a photoinitiating system for free radical/cationic hybrid polymerization under mild irradiation conditions. The G1 system (G1/iodonium salt/N-vinylcarbazole), can simultaneously initiate the free radical and cationic polymerization reactions upon exposure to a visible (405 nm) light from a Light Emitting Diode (LED) source. The multicomponent G1 system is able to simultaneously generate radical and cationic species through a catalytic photoredox process. The curing of thin samples (25 mu m), thick samples (1.4 mm) as well as the manufacture of hybrid system/glass fibers composites ( 2 to 4 mm thickness) was realized and the influence of the ratio of cationic/radical monomer blends on the polymerization kinetics was studied. The use of G1 in visible light photoinitiating system for the access to composites and 3D printing experiments was particularly outlined. G1 was also shown to have low levels of migration from the cured materials. When compared to reference materials ("F1", a similar copper complex and an anthracene derivative, dibutoxy anthracene), G1 showed better polymerization efficiency. The initiation efficiency was investigated through the real-time Fourier transform infrared (RT-FTIR) spectroscopy and optical pyrometry. Dynamical Mechanical Analysis has been used to determine the glass temperature transition of the cured hybrid system as a complementary technique

3.10 - Nitroxide-Mediated Polymerization

International audienceThis chapter covers the main achievements in nitroxide-mediated polymerization (NMP) from its discovery to late 2010. The various synthetic approaches to nitroxides and alkoxyamines are first presented. The range of monomers for NMP, kinetic features, as well as polymerization in aqueous dispersed media are also discussed. Finally, functionalization strategies of NMP-derived polymers, macromolecular architectures, and biomaterials are detailed

Synthesis of Alkoxyamines: A New Method

Comunicazione Scientifica al 5th International Conference on Nitroxide Radicals "SPIN 2008" - Ancona (Italy

A room temperature stable 1,3-diphosphaallyl radical

Canac Y, Baceiredo A, Schoeller W, Gigmes D, Bertrand G. A room temperature stable 1,3-diphosphaallyl radical. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. 1997;119(32):7579-7580

Verwendung einer Inhibitorkombination, Harzmischung, Reaktionsharzmörtel, Zweikomponenten - Mörtelsystem und dessen Verwendung sowie Patrone, Kartusche oder Folienbeutel enthaltend ein Zweikomponenten - Mörtelsystem

Verwendung einer Kombination aus einer Verbindung der allgemeinen Formel (I):in der R1 und R2 jeweils unabhängig voneinander Wasserstoff oder eine unverzweigte oder verzweigte C1-C20-Alkylgruppe ist, X -OR3 oder -NR3 2 ist, wobei R3 eine unverzweigte oder verzweigte C1-C20-Alkylgruppe oder eine C2-C4-Polyalkylenoxid-Gruppe ist, und einer Verbindung der allgemeinen Formel (II):in der R Wasserstoff, eine unverzweigte oder verzweigte C1-C18-Alkylgruppe oder -OR3 oder -NR3 2 ist, wobei R3 eine verzweigte oder unverzweigte C1-C20-Alkylgruppe ist, R' Wasserstoff, eine unverzweigte oder verzweigte C1-C18-Alkylgruppe ist und R'' eine unverzweigte oder verzweigte C1-C18-Alkylgruppe ist, zur Einstellung der Reaktivität und der Gelzeit von Harzmischungen auf Basis von radikalisch polymerisierbaren Verbindungen

Stabilità Termica di Alcossiammine da impiegare nelle Polimerizzazioni Radicaliche

Comunicazione Scientifica al 9th Congress of the Italian ESR Group (GIRSE), Rimini (Italy), 201