Marcia Bär Schuster

Scopus Publications

Green-solvent Extraction of Guabijú (Myrcianthes pungens) Fruit: A Sustainable Antioxidant Source for Oil-in-Water Emulsions
Liciani Inaê Putti, Luana Bettanin, Thais Fernanda de Marco, Marcia Bär Schuster, Jaqueline Scapinello, et al.
Food Biophysics, 2026
Unencapsulated and encapsulated Enterococcus faecium E297 added to oat flakes: protective effect against Salmonella Enteritidis in a simulated gastrointestinal system
Rafaela Ansiliero, Taís Nunzio Müller, Stéfani Mallmann, Josiane Marcon, Márcia Bar Schuster, et al.
Biocatalysis and Agricultural Biotechnology, 2026
Toughening of thermoset matrix: effect of triblock copolymer addition and block sequence of PEG and PPG on phase morphology
Lohana Vieira Bataglini, Maria Luiza Paganini Maia, Bruna Louise Silva, Marlene Bampi, Luana Bettanin, et al.
Polymer International, 2025
In this study, an epoxy resin (diglycidyl ether of bisphenol A) was modified with triblock copolymers: poly(ethylene glycol)–poly(propylene glycol)–poly(ethylene glycol) (PEG‐PPG‐PEG) or PPG‐PEG‐PPG, with 10 wt% PEG in their structure, referred to as EPE and PEP, respectively. The aim was to evaluate the influence of the PEG and PPG block sequence on the phase morphology and enhance the fracture toughness of the thermoset matrix. Scanning electron microscopy revealed immiscibility for PEP systems and partially miscible to immiscible behavior for EPE systems, depending on the mass fraction used. The EPE fraction reduced the size of the dispersed phase, while the PPG end‐group block sequence in PEP suppressed coalescence, stabilizing the dispersion and decreasing dispersed phase size. Differential scanning calorimetry showed a reduction of ca 20 °C in the glass transition temperature for the EPE systems, while for the PEP systems there were no significant changes, corroborating the immiscible system found in microscopy. Analysis of the mechanical properties revealed that incorporating the copolymer enhanced fracture energy absorption, as demonstrated by the increased toughness (up to 41%) compared to the neat epoxy. Systems with smaller spherical/ellipsoidal domains exhibited greater toughness, indicating that particle distribution and size significantly influence the material's toughness. Regarding tensile results, a reduction in tensile strength values was observed for all modified systems, especially for the EPE‐10 system. These findings underscore the significance of the block sequence in triblock copolymers, emphasizing the importance of tailoring specific morphologies to enhance mechanical properties. © 2025 The Author(s). Polymer International published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
Co-encapsulation of E. faecium E297 and γ-aminobutyric acid (GABA): resilience to adverse conditions and application in oat flakes to enhance its functional properties
Rafaela Ansiliero, Márcia Bar Schuster, Aniela Pinto Kempka, Liziane Schittler Moroni
Brazilian Journal of Microbiology, 2025
Bamboo shoot powder: Characterization and application in culinary processed cheese “Requeijão”
João Eduardo Gomes de Oliveira, Bruna Camili Scopel, Luana Bettanin, Márcia Bär Schuster, Marcio Schmiele, et al.
International Journal of Gastronomy and Food Science, 2024
Biofilm formation by Listeria monocytogenes from the meat processing industry environment and the use of different combinations of detergents, sanitizers, and UV-A radiation to control this microorganism in planktonic and sessile forms
Larissa Siqueira Lima, Taís Nunzio Müller, Rafaela Ansiliero, Marcia Bär Schuster, Bruna Louise Silva, et al.
Brazilian Journal of Microbiology, 2024
The Influence of the Molecular Architecture of the Peg: Ppg Triblock Copolymer on the Properties of Epoxy Nanocomposites
Bruna L. Silva, Marcia B. Schuster, Daniela Becker, Luiz A.F. Coelho
Materials Research, 2022
11, 2022. This work focuses on characterizing the role of different triblock copolymers on the dispersion of nanoparticles in an epoxy matrix and in the thermal and mechanical properties of the resulting nanocomposites, using Poly (ethylene glycol) - block-poly (propylene glycol) - block-poly (ethylene glycol) (PEG-b-PPG- b-PEG) with 30% PEG, and poly (propylene glycol) - block-poly (ethylene glycol) - block-poly (propylene glycol) (PPG-b-PEG-b-PPG) with 50% PEG. The nanoparticles employed have different geometries: carbon nanotubes, graphene nanoplatelets and carbon black (spherical). Both copolymers were miscible in epoxy. The results suggest that the copolymers viscosity may be interfering with the dispersion of the nanoparticles in the matrix: the PPG-b- PEG-b-PPG50% copolymer has a higher viscosity than the PEG b-PPG-b-PEG30%, which facilitates their dispersion and an increase in mechanical properties. The PEG fraction was an important factor in the dispersion of nanoparticles in the epoxy matrix. The higher the PEG content in the copolymer block, the greater the synergy shown in the mechanical properties, since the nanoparticles inhibited the plasticizing effect of the
The effects of carbon nanoparticles on curing kinetics of epoxy modified with triblock copolymer
Bruna Louise Silva, Marcia Bär Schuster, Roger Hoel Bello, Daniela Becker, Luiz Antonio Ferreira Coelho
Polymer Bulletin, 2022
Effects of adding different concentrations of block copolymers in epoxy matrix nanocomposites with carbon allotropic nanoparticles
Marcia Bär Schuster, Iury Körting de Abreu, Daniela Becker, Luiz A. F. Coelho
Polymer Composites, 2021
The role of carbon nanoparticles in epoxy-based nanocomposites modified with (poly[polypropylene oxide]-block-poly[ethylene oxide]-block-poly[propylene oxide]) triblock copolymers on phase morphology and mechanical properties
Bruna L. Silva, Marcia B. Schuster, Roger H. Bello, Daniela Becker, Luiz A. F. Coelho
Polymer Composites, 2020
The main goal of this work is to show the role of carbon nanoparticle geometry and poly(ethylene oxide):poly(propylene oxide) (PEG:PPG) ratio on the miscibility, morphology, and final properties of an epoxy resin modified with triblock copolymers PPG‐block‐PEG‐block‐PPG (PPG‐b‐PEG‐b‐PPG). The employed copolymers have different PEG:PPG ratios in their molecular structure. One of them is miscible and the other is immiscible in epoxy resin. The used carbon nanoparticles were multiwalled carbon nanotubes, graphene nanoplatelets, and carbon black in a concentration of 0.5 wt/wt% for all nanoparticles. Adding the nanoparticles did not influence the miscibility of the PPG‐b‐PEG‐b‐PPG copolymer in the resin. However, the different geometries of the nanoparticles interfered in the dispersion, reflecting on the mechanical and thermal properties of the epoxy‐based nanocomposites. Nanocomposites in a miscible system with graphene nanoparticles showed a 10% increase in Young's modulus over the neat resin. Immiscible systems with carbon black nanoparticles presentedKIcvalues 81% higher than the neat matrix, while the numerical valueKIcwas only 6.5% higher than the neat resin for the miscible ones. Besides, a synergistic effect was observed between the copolymer/nanoparticles on the toughness of the nanocomposites. Finally, the nanoparticles minimized the negative effect of the block copolymer on Young's modulus and the glass transition temperature of the neat resin.
Toughness and roughness in hybrid nanocomposites of an epoxy matrix
Marcia B. Schuster, Luiz A.F. Coelho
Polymer Engineering and Science, 2019
Role and sinergy of block copolymer and carbon nanoparticles on toughness in epoxy matrix
Marcia B. Schuster, Carlos V. Opelt, Daniela Becker, Luiz A.F. Coelho
Polymer Composites, 2018
The processing of polycarbonate nanocomposites generated with various nanofillers
M.B. Schuster, D. Becker, L.A.F. Coelho
Manufacturing of Nanocomposites with Engineering Plastics, 2015

Marcia Bär Schuster

RESEARCH, TEACHING, or OTHER INTERESTS

Scopus Publications