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Microplásticos: impacto ambiental de polímeros fotodegradados
(Universidade Federal de São Carlos, 2020-02-03)
Plastics have been studied for their environmental impact, since when discarded in the environment they do not disappear. Over time they degrade and fragment into smaller pieces, reaching the microscale. When exposed to ...
Obtenção de nanocelulose a partir da funcionalização da celulose por oxipropilação
(Universidade Federal de São Carlos, 2020-03-27)
The present study aimed to obtain functionalized nanocellulose through the oxypropylation reaction. Thereunto, the cellulose was submitted to an initial activation step with a sodium hydroxide solution, and then the reaction ...
Desenvolvimento e caracterização de filmes poliméricos de amido de milho com incorporação de fibras de bagaço de cevada
(Universidade Federal de São Carlos, 2020-03-25)
Interest in the use of starch for biodegradable films is growing due to being a natural, renewable, abundant and low cost source. However, starch films generally have low values of mechanical properties. Thus, this work ...
Comparação do método químico e método a plasma no preparo de nanocompósitos de prata e nanocelulose
(Universidade Federal de São Carlos, 2020-04-02)
Cellulose, being a biodegradable material, flexible and with good mechanical resistance, has been attracting great interest in studies, as it is a biopolymer from a renewable source and widely available in nature. It can ...
Fracionamento de lignina proveniente do processo kraft para obtenção de frações com diferentes massas molares e aplicação em materiais funcionais: espumas de carbono.
(Universidade Federal de São Carlos, 2023-02-01)
This thesis has three main objectives: (i) To describe an efficient fractionation method for Kraft lignin (KL) to extract large amounts of low molecular weight lignin, which indicates the presence of a higher content of ...
Obtenção de um híbrido de sílica e colágeno pelo processo sol-gel visando regeneração óssea
(Universidade Federal de São Carlos, 2023-03-23)
The bone regeneration materials exploring is constantly increasing due to the lesions from traumas, illness and aging, that can cause serious complications and functionality loss. Biomaterials are used in order to stimulate ...
Desenvolvimento e caracterização de gel bioativo à base de fibroína da seda/PLDLA/sinvastatina para impressão 3D
(Universidade Federal de São Carlos, 2022-08-30)
Bone Tissue Engineering (BOT) has been growing in recent decades as an effective approach for the treatment of large bone defects. Recently, three-dimensional (3D) printing has emerged as a tool to revolutionize the field ...
Funcionalização química de nanofibrilas de celulose com haleto orgânico e hidrogenossulfato
(Universidade Federal de São Carlos, 2022-12-19)
Belonging to the chemical group of carbohydrates and considered the main component of the plant cell wall, ensuring protection and support for the development of vegetables, cellulose is the most abundant biopolymer on ...
Nanocristais de celulose provenientes de fibras amazônicas com potencial aplicação na produção de nanocompósitos
(Universidade Federal de São Carlos, 2021-11-19)
Among all the natural polymers, we can highlight the use of cellulose, a mutable and profuse biopolymer in nature, which has enormous chemical variability due to the functionalization of its various hydroxyl groups. It can ...
Manufatura e caracterização mecânica de painéis estruturais compósitos para projetos de veículos de competição.
(Universidade Federal de São Carlos, 2023-02-17)
Due to evolution of development high performance composite, these have been increasingly used in racing car components, because the good trade-of between mass/stiffness incorporated to high levels of driver safety risk. ...