Polycaprolactone-Polyaniline Blend: Effects of the Addition of Cysteine on the Structural and Molecular Properties

Autor(es)

Kogikoski, Jr., Sergio ; Liberato, Michelle S. ; Factori, Irina M. ; da Silva, Emerson R. ; Oliveira, Cristiano L. P. ; Ando, Romulo A. ; Alves, Wendel A.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 121, n. 1, p. 863-877, JAN 12 2017.
• Citações Web of Science: 8

Resumo

Organic molecule conjugates usually arrange themselves into complex multiphase systems that are sensitive to processing and focal chemical environment. Moreover, these conjugates are able to self-assemble at different scales, varying from nano- to macroscale. In addition, intermolecular interactions introduce structural variations its the molecular packing and large-scale ordering, which directly affects different physicochemical properties of the materials. Herein, we study the synthesis of polymer blends based on poly(epsilon)-caprotactone (PCL) with polyanilirie-(PANT), doped with the amino acid N-acetyl-L-cysteine (NAC). Samples were prepared either through solution casting or via electrospinning methods. The materials were characterized regarding their morphological, structural, and, molecular properties at different length scales. From the results obtained, the relationship between changes in blend properties and different NAC concentrations was determined. Deep structural details have been unveiled by using different characterization techniques, including X-rays microcomputed tomography (Micro-CT), small- and wide-angle scattering (SAXS and WAXS), and differential scanning calorimetry (DSC). Our findings indicated that NAC enhances organization and crystallinity index of the blonds and that a close relationship appears between the synthesis method and the internal micronanostructure. It is also shown that NAC modifies the molecular properties of PANI. Through spectroscopic techniques (UV-vis and resonant Raman), it was shown that NAC favors the formation of different forms of PANI. In addition, thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) showed the formation of a supramolecular structure maintained by sulfur-pi (SH-pi) intermolecular interactions between PANT and NAC. (AU)

• Processo FAPESP: 08/57805-2 - Instituto de Bioanalítica
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/12997-0 - Auto-organização hierárquica de peptídeos anfifílicos: mecanismos fundamentais e potenciais aplicações
• Beneficiário: Wendel Andrade Alves
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/01933-8 - Matrizes biomiméticas obtidas por eletrofiação: possível aplicação na detecção de NO
• Beneficiário: Sergio Kogikoski Junior
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 12/15481-1 - Matrizes poliméricas funcionais preparadas por eletrofiação: Estudos das propriedades estruturais e processos de biodegradação
• Beneficiário: Michelle da Silva Liberato
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/24018-1 - Conjugados polímero-peptídeo para formulação de hidrogéis e seu uso em detecção
• Beneficiário: Wendel Andrade Alves
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/12674-6 - Investigações estruturais em sistemas-modelo à base de peptídeos anfifílicos
• Beneficiário: Emerson Rodrigo da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado