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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Kogikoski, Jr., Sergio ; Liberato, Michelle S. ; Factori, Irina M. ; da Silva, Emerson R. ; Oliveira, Cristiano L. P. ; Ando, Romulo A. ; Alves, Wendel A.
Total Authors: 7
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 121, n. 1, p. 863-877, JAN 12 2017.
Web of Science Citations: 8
Abstract

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)

FAPESP's process: 12/15481-1 - Functional polymer matrices prepared by electrospinning: Studies of structural properties and biodegradation processes
Grantee:Michelle da Silva Liberato
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/12674-6 - Structural investigations on model systems based on amphiphilic peptides
Grantee:Emerson Rodrigo da Silva
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/01933-8 - Biomimetic electrospun matrixes: possible application in NO detection
Grantee:Sergio Kogikoski Junior
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 15/24018-1 - Polymer-Peptide Conjugates for hydrogel formulation and its usage in detection
Grantee:Wendel Andrade Alves
Support type: Regular Research Grants
FAPESP's process: 08/57805-2 - Institute of Bioanalytics
Grantee:Lauro Tatsuo Kubota
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/12997-0 - Hierarchical self-organization of peptide amphiphiles: fundamental mechanisms and potential applications
Grantee:Wendel Andrade Alves
Support type: Regular Research Grants