| Texto completo | |
| Autor(es): |
Gabriel, Arthur M.
;
Sierra e Silva, Maria L. L.
;
de Camargo, Emerson R.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS OMEGA; v. 10, n. 37, p. 9-pg., 2025-09-12. |
| Resumo | |
This study investigates the use of SiO2 nanoparticles as functional modifiers in the polymerization of poly(N-vinylcaprolactam) (PNVCL), aiming to tailor the polymer's molecular weight and physicochemical and rheological behaviors. The incorporation of nanoparticles into polymerization systems has emerged as a promising strategy to modulate the reaction kinetics and polymer chain growth. In this work, SiO2 nanoparticles (similar to 18 nm) were synthesized via the Stober method, incorporated into the radical polymerization reaction of PNVCL at a concentration ranging from 0.5 to 3.0%, and recovered post synthesis. Gel permeation chromatography results revealed that increasing the nanoparticle concentration led to a notable rise in the weight-average molecular weight from 33 to 70 kDa. Rheological analysis revealed that the materials exhibited a predominantly viscous behavior (G '' > G ') both below and above the lower critical solution temperature, suggesting incomplete gelation transitions. These findings demonstrate that SiO2 nanoparticles can act as polymerization modulators, enabling control over molecular weight distribution and viscoelastic properties, with relevance for thermoresponsive systems for drug delivery and related biomedical technologies. (AU) | |
| Processo FAPESP: | 22/10016-0 - Nanocompósitos termossensíveis para transporte e liberação controlada de medicamentos |
| Beneficiário: | Arthur Martins Gabriel |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 24/00989-7 - Centro de Pesquisa em Engenharia Molecular para Materiais Avançados (CEMol) |
| Beneficiário: | Edson Roberto Leite |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |