Photopolymerization of (meth)acrylates in the presence of polyheteroarylenes

Soluble Fluorinated Cardo Copolyimide as an Effective Additive to Photopolymerizable Compositions Based on Di(meth)acrylates: Application for Highly Thermostable Primary Protective Coating of Silica Optical Fiber

“…Based on previous results [38][39][40]46,47,58], it was suggested that the introduction of FCPI into di(meth)acrylates will improve the thermal stability and strength properties of corresponding polymer compositions, which is important for the formation of protective coatings of silica optical fibers. To investigate these properties, films were prepared from unmodified monomers and their blends with FCPI (see the details in the experimental section).…”

“…The study of the kinetics of free radical thermal and photopolymerization (meth)acrylates in the presence of polyimide, polyarylate and their model compounds by differential scanning photocalorimetry, FTIR, ESR spectroscopy, etc. [38,[41][42][43][44][45][46][47] allowed us to identify the mechanism of copolymer formation due to the chain transfer reaction to functional groups of polyheteroarylenes, in particular to imide cycles [42,43,46,47]. The introduction of polyheteroarylenes into the monomer(s) and subsequent polymerization in situ contributed to an increase in the thermal and mechanical properties of the copolymers formed compared to unmodified carbon-chain homopolymers [37][38][39][40][41][42][43][44][45][46][47], opening up wide possibilities for obtaining various functional materials.…”

Achievements in polycondensation and condensation polymers

“…At the same time, it was found that the functional groups of several polyheteroarylenes soluble in unsat urated monomers-for example, PIs, aromatic PAs, and polyarylates-interact with free radicals during the polymerization of acrylates, styrene, and other vinyl monomers [276][277][278][279]. As a result, graft copoly mers based on polyheteroarylenes and carbochain polymers with improved thermal and mechanical properties are formed, even if the amount of conden sation polymers is low (4-10 wt %) [276][277][278][279][280][281].…”

“…As a result, graft copoly mers based on polyheteroarylenes and carbochain polymers with improved thermal and mechanical properties are formed, even if the amount of conden sation polymers is low (4-10 wt %) [276][277][278][279][280][281].…”

Síntese e caracterização de beads acrílicos preparados por polimerização em suspensão visando aplicação como excipiente farmacêutico para compressão direta

“…Os polímeros acrílicos e metacrílicos exibem absorção nas regiões do infravermelho relacionadas à presença de ésteres, sendo característicos dubletos próximos a 2900 cm -1 (estiramentos C-H); banda intensa próxima a 1730 cm -1 (carbonila) e bandas a 1450 e 1385 cm -1 (deformação C-H). 65,66 Como pode ser visto na Figura 2, houve o desaparecimento das bandas na região de 1630 cm -1 , o que indica a ocorrência de polimerização dos monômeros acrílicos durante a formação dos beads. A existência de bandas intensas a 1720 -1738 cm -1 se refere à vibração de estiramento da carbonila de ésteres conjugados.…”