Understanding the Microstructure Connectivity in Photopolymerizable Aluminum-Phosphate-Silicate Sol-Gel Hybrid Materials for Additive Manufacturing

Autor(es)

Tayama, Gabriel Toshiaki ; Santagneli, Silvia Helena ; de Oliveira Jr, Marcos ; Messaddeq, Younes

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. N/A, p. 14-pg., 2023-01-30.

Resumo

In this paper, we report the synthesis and structural characterization of transparent and photopolymerizable aluminum-phosphate-silicate hybrid materials obtained via the sol-gel route, with different aluminum/phosphate (Al/P) ratios. We explored the system Si(1-x)-(Al/P) (x) with x varying from 0.3 to 1, and atomic ratios of Al/P are 1:3, 1:1, and 3:1. All compositions contain high inorganic mass content (up to 40 wt %). Furthermore, they are compatible with vat-photopolymerization platforms. The structural evolution of the hybrid materials with the silicon concentration was investigated by SEM, phase-contrast AFM, and solid-state NMR techniques, using single-and double-resonance experiments. The structure follows the build-up principle using aluminum phosphate species and alkoxysilane chains as fundamental building blocks. These aluminum-phosphate species were identified as monomeric and dimeric chain structures by comparing different parameters obtained from NMR data to compound models. Monomeric and dimeric aluminum-phosphate chain structures were predominant in 3:1 and 1:3 Al/P ratio samples, respectively, promoting and hindering the heterocondensation with the alkoxysilane precursor, respectively. The photopolymerization mechanism leads to the percolation of the inorganic networks through a parallel polymethylmethacrylate network, resulting in a material with structural heterogeneities in the range of 5 nm, evidenced by phase-contrast AFM. (AU)

• Processo FAPESP: 18/24735-3 - Correlação entre a estrutura e as propriedades investigada por RMN multinuclear no estado sólido em materiais desordenados
• Beneficiário: Silvia Helena Santagneli
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/22828-6 - Ultrapassando as fronteiras de fibras ópticas: da fotônica até optogenética e monitoramento de meio ambiente
• Beneficiário: Younes Messaddeq
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC
• Processo FAPESP: 18/06426-3 - Desenvolvimento de coacervatos para manufatura aditiva/impressão 3D de materiais fotônicos
• Beneficiário: Gabriel Toshiaki Tayama
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto