1 research outputs found
Microporous Thioxanthone Polymers as Heterogeneous Photoinitiators for Visible Light Induced Free Radical and Cationic Polymerizations
Conjugated
microporous polymeric networks possessing thioxanthone
groups were reported to initiate free radical and cationic polymerizations
of vinyl monomers and cyclic ethers, respectively, under visible light
irradiation. These new classes of <i>Type II</i> macrophotoinitiators with
high porosity having large BET surface area of 500–750 m<sup>2</sup> g<sup>–1</sup> were prepared through different cross-coupling
processes. Polymerizations are successfully achieved in conjugation
with several co-initiators benefiting from hydrogen abstraction or
electron transfer reactions stimulated by either visible light or
natural sunlight irradiation. Photopolymerizations conducted by using
knitted photoinitiators show better conversion and rate of polymerization
than those obtained via Sonogashira–Hagihara coupling. The
heterogeneous nature of the photoinitiators makes them easily separable
from the media and more importantly reusable for further polymerizations
while retaining the photocatalytic activity