Geopolymers
Inorganic polymeric new materials
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Juliana Cordeiro Cardoso
Juliana Cordeiro Cardoso
Laboratório de Biomateriais, Instituto de Tecnologia e Pesquisa/Universidade Tiradentes, Av. Murilo Dantas, 300, Aracaju, Sergipe, 49032–490, Brazil
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Ricardo Luiz C. Albuquerque Jr.
Ricardo Luiz C. Albuquerque Jr.
Laboratório de Biomateriais, Instituto de Tecnologia e Pesquisa/Universidade Tiradentes, Av. Murilo Dantas, 300, Aracaju, Sergipe, 49032–490, Brazil
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Francine Ferreira Padilha
Francine Ferreira Padilha
Laboratório de Biomateriais, Instituto de Tecnologia e Pesquisa/Universidade Tiradentes, Av. Murilo Dantas, 300, Aracaju, Sergipe, 49032–490, Brazil
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Felipe Oliveira Bittencourt
Felipe Oliveira Bittencourt
Laboratório de Biomateriais, Instituto de Tecnologia e Pesquisa/Universidade Tiradentes, Av. Murilo Dantas, 300, Aracaju, Sergipe, 49032–490, Brazil
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Osvaldo de Freitas
Osvaldo de Freitas
Departamento de Ciências Farmacêuticas de Ribeirão Preto, FCFRP - Universidade de São Paulo, Ribeirão Preto, Brazil
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Paula Santos Nunes
Paula Santos Nunes
Departamento de Fisiologia, Universidade Federal de Sergipe, Av. Marechal Rondon, s/n, Cidade Universitária, São Cristóvão, Sergipe, 49100–000, Brazil
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Newton L. Pereira
Newton L. Pereira
Departamento de Ciências Farmacêuticas de Ribeirão Preto, FCFRP - Universidade de São Paulo, Ribeirão Preto, Brazil
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Maria José Vieira Fonseca
Maria José Vieira Fonseca
Departamento de Ciências Farmacêuticas de Ribeirão Preto, FCFRP - Universidade de São Paulo, Ribeirão Preto, Brazil
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Adriano Antunes S. Araújo
Adriano Antunes S. Araújo
Departamento de Fisiologia, Universidade Federal de Sergipe, Av. Marechal Rondon, s/n, Cidade Universitária, São Cristóvão, Sergipe, 49100–000, Brazil
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Abstract
The use of biodegradable natural polymers has increased due to the over-solid packaging waste. In this study, a chemical modification of the casein molecule was performed by Maillard reaction, and the modified polymer was evaluated by polyacrylamide gel electrophoresis (PAGE), thermogravimetry/derivative thermogravimetry (TG/DTG), FT-IR, and 1H-NMR spectroscopy. Subsequently, films based on the modified casein were obtained and characterized by mechanical analysis, water vapor transmission, and erosion behavior. The PAGE results suggested an increase of molecular mass of the modified polymer, and FT-IR spectroscopy data indicated inclusion of C–OH groups into this molecule. The TG/DTG curves of modified casein presented a different thermal decomposition profile compared to the individual compounds. Mechanical tests showed that the chemical modification of the casein molecules provided higher elongation rates (45.5%) to the films, suggesting higher plasticity, than the original molecules (13.4%). The modified casein films presented higher permeability (0.505 ± 0.006 μg/h mm3) than the original polymer (0.387 ± 0.006 μg/h mm3) films at 90% relative humidity (RH). In pH 1.2, modified casein films presented higher erosion rates (32.690 ± 0.692%) than casein films (19.910 ± 2.083%) after 8 h, suggesting an increased sensibility for erosion of the modified casein films in acid environment. In water (pH 7.0), the films erosion profiles were similar. Those findings indicate that the modification of molecule by Maillard reaction provided films more plastic, hydrophilic, and sensitive to erosion in acid environment, suggesting that a new polymer with changed properties was founded.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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