| Texto completo | |
| Autor(es): |
Kodama, Yasko
;
Barbosa, Andrey S.
;
Santos, Bianca P. S.
;
Linardi, Marcelo
;
Santiago, Elisabete I.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | REACTIVE & FUNCTIONAL POLYMERS; v. 218, p. 13-pg., 2025-10-24. |
| Resumo | |
Reversible addition-fragmentation chain transfer (RAFT) agents can be employed to control radical polymerization processes in the synthesis of anion-exchange membranes (AEMs) via radiation-induced grafting (RIG). However, the influence of the RAFT agent content on the performance of anion-exchange membrane fuel cells (AEMFCs) remains largely unexplored. Herein, we present a flexible method for AEM preparation that combines the radiation chemistry of polymers with RAFT polymerization. Low-density polyethylene (LDPE) films were simultaneously irradiated with vinylbenzyl chloride (VBC) monomer and RAFT agent to achieve rigorous control over the molecular weight of the grafted side chains. The incorporation of RAFT agent into the LDPE-grafted polymer chains significantly reduced the degree of grafting, and gel permeation chromatography (GPC) measurements confirmed the reduction in molecular weight. Cross-sectional Raman microscopy revealed that the RAFT protocol also improved graft homogeneity across the polymer matrix. Furthermore, the mechanical properties and surface morphology of the resulting AEMs were enhanced by the use of the RAFT method. The membranes were subsequently characterized in terms of ion-exchange capacity, water uptake, in-plane and through-plane swelling, thermal stability, and hydroxide conductivity. Single-AEMFC tests, as well as chemical stability measurements, demonstrated that RAFT-based AEMs maintained high performance (similar to 1.3 W<middle dot>cm(-2)), while exhibiting a markedly lower IEC loss (similar to 30 %) compared to non-RAFT AEMs, thus contributing significantly to AEMFC stability. (AU) | |
| Processo FAPESP: | 23/14931-8 - Dispositivos eletroquímicos avançados de conversão de moléculas e produção de energia |
| Beneficiário: | Fabio Coral Fonseca |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 17/11937-4 - Rota sustentável para a conversão de metano com tecnologias eletroquímicas avançadas |
| Beneficiário: | Fabio Coral Fonseca |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 24/01763-2 - Novas membranas trocadoras de ânions assimétricas para células a combustível |
| Beneficiário: | Andrey da Silva Barbosa |
| Modalidade de apoio: | Bolsas no Brasil - Programa Capacitação - Treinamento Técnico |
| Processo FAPESP: | 22/07786-9 - Novas membranas trocadoras de ânions assimétricas para células a combustível |
| Beneficiário: | Elisabete Inacio Santiago |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |