Poly(propylene imine) dendrimers as hydrogen donor in Type II photoinitiated free radical polymerization

In situ synthesis of polymer/clay nanocomposites by type II photoinitiated free radical polymerization

“…The photoinitiated free radical polymerization can be initiated by both cleavage (Type I) and H‐abstraction type (Type II) photoinitiators 34. Type II photoinitiators undergo a bimolecular reaction where the excited state of the photoinitiator interacts with a hydrogen donor to generate free radicals 35–37. Because of their better optical absorption properties in the near‐UV spectral region, these type photoinitiators are preferred in applications where the long wavelength absorption is required 38–43…”

Photo-irradiation paradigm: Mapping a remarkable facile technique used for advanced drug, gene and cell delivery

“…As highly branched, well-defined, and nano-size architected carriers, dendrimers can either encapsulate drug molecules into the interior of its branches before photo-irradiation process or chemically attach/physically adsorb drug onto the photo-crosslinked dendrimer surface [6,161,162]. Many of these incorporated drugs have been found to be consistently released through fickian diffusion mechanism with an initial burst effect [6].…”

“…Many of these incorporated drugs have been found to be consistently released through fickian diffusion mechanism with an initial burst effect [6]. In a study conducted by Tasdelen et al photo-cured poly(propylene imine) dendrimers were prepared in a photoreactor by the photo-crosslinking of poly(propylene imine) with methyl methacrylate [162]. However in a more convenient methodology for the synthesis, Zhang et al photo-irradiated polyamidoamine-double bond and PEG-co-poly(glycolic acid)-co-methacryloylchloride to obtain a biodegradable dendrimeric drug carrier [6].…”

Synthesis of clickable hydrogels and linear polymers by type II photoinitiation

“…Free radical photopolymerization is based on the photochemical generation of initiating species through two main processes, namely cleavage (type I) or hydrogen abstraction (type II) reactions. In type II systems, initiating radicals are generated by bimolecular interactions of compounds whose triplet excited states readily react with hydrogen donors . Many thioxanthone and camphorquinone based photoinitiators have been developed and successfully used in various applications …”