| Texto completo | |
| Autor(es): |
Netto, Rafael Affonso
;
de Carvalho, Guilherme Ribeiro
;
Staffa, Lucas Henrique
;
Lona, Liliane Maria Ferrareso
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | EXPRESS POLYMER LETTERS; v. 19, n. 2, p. 15-pg., 2025-02-01. |
| Resumo | |
This study aimed first to promote the alkylation of polyethyleneimine (PEI), developing its alkylated (quaternary) form (QA-PEI) by inserting alkyl groups into amine groups. Subsequently, polymer blends with poly(methyl methacrylate) (PMMA) were prepared via solvent casting, and finally, the physicochemical, optical, and mechanical behavior of the resulting PMMA/QA-PEI were assessed. Elemental analyses, Fourier-transform infrared spectroscopy (FT-IR), and hydrogen nuclear magnetic resonance spectroscopy (1H-NMR) confirmed that the PEI alkylation successfully converted the amine groups into quaternary ammonium groups. When added to PMMA, QA-PEI altered its coloration, making it yellow. In addition, higher contents of QA-PEI hindered PMMA transmittance and increased its opacity due to the larger QA-PEI domains. Scanning electron microscopy (SEM) images showed that PMMA and QA-PEI formed a phase-separated system, establishing a droplet-matrix morphology. The thermal and mechanical behavior showed some compatibility between PMMA and QA-PEI as thermal resistance slightly improved and PMMA glass transition temperature (Tg) decreased. The tensile strength was also improved in the PMMA/QA-PEI blends without significant change in strain at break and tensile modulus. (AU) | |
| Processo FAPESP: | 23/12419-8 - Valorização da celulose e lignina para a produção de materiais com potencial aplicação nas áreas médica e de embalagem |
| Beneficiário: | Liliane Maria Ferrareso Lona |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 21/09341-1 - Materiais poliméricos funcionais alternativos com potencial aplicação no auxílio do tratamento e da poliferação de doenças |
| Beneficiário: | Liliane Maria Ferrareso Lona |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |