Tracking Sulfonated Polystyrene Diffusion in a Chitosan/Carboxymethyl Cellulose Layer-by-Layer Film: Exploring the Internal Architecture of Nanocoatings

Autor(es)

Taketa, Thiago B. ^[1] ; Rocha Neto, Joao Batista M. ^[1] ; dos Santos, Danilo M. ^[2] ; Fiamingo, Anderson ^[2] ; Beppu, Marisa M. ^[1] ; Campana-Filho, Sergio Paulo ^[2] ; Cohen, Robert E. ^[3] ; Rubner, Michael F. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Chem Engn, BR-13083970 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[3] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 - USA

^[4] MIT, Dept Chem Engn, Cambridge, MA 02139 - USA

• Tipo de documento: Artigo Científico
• Fonte: Langmuir; v. 36, n. 18, p. 4985-4994, MAY 12 2020.
• Citações Web of Science: 0

Resumo

Since chitosan presents the ability to interact with a wide range of molecules, it has been one of the most popular natural polymers for the construction of layer-by-layer thin films. In this study, depth-profiling X-ray photoelectron spectroscopy (XPS) was employed to track the diffusion of sulfonated polystyrene (SPS) in carboxymethyl cellulose/chitosan (CMC/Chi) multilayers. Our findings suggest that the CMC/Chi film does not constitute an electrostatic barrier sufficient to block diffusion of SPS, and that diffusion can be controlled by adjusting the diffusion time and the molecular weight of the polymers that compose the CMC/Chi system. In addition to monitoring the diffusion, it was also possible to observe a process of preferential interaction between Chi and SPS. Thus, the nitrogen N 1s peak, due to functional groups found exclusively in chitosan chains, was the key factor to identifying the molecular interactions involving chitosan and the different polyanions. Accordingly, the presence of a strong polyanion such as SPS shifts the N 1s peak to a higher level of binding energy. Such results highlight that understanding the fundamentals of polymer interactions is a major step to fine-tuning the internal architecture of LbL structures for specific applications (e.g., drug release). (AU)

• Processo FAPESP: 13/05135-1 - Recobrimentos antimicrobianos e nanoestruturados contendo quitosana produzidos pela técnica de automontagem (layer-by-layer) para substratos têxteis
• Beneficiário: Thiago Bezerra Taketa
• Modalidade de apoio: Bolsas no Brasil - Doutorado