Catálogo de publicaciones - tesis
Título de Acceso Abierto
Alternativas de disolución de celulosa para la obtención de productos regenerados
Graciela Viviana Olmos Mirtha Graciela Maximino Mirta Inés Aranguren María Evangelina Vallejos Diana Alejandra Estenoz Julio Alcides Deiber
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Resumen/Descripción – provisto por el repositorio digital
Cellulose is the most abundant biopolymer in the earth, however, its use is restricted by limitations derived from its structure. Since its melting point is higher than the degradation temperature, its dissolution is the only route for the manufacture of regenerated cellulose products. Currently the viscose process is the most widely dissolution method used in the industry, despite the pollution problems caused by the use of carbon disulfide. In this work mechanical and enzymatic treatments were performed to increase the reactivity and accessibility of the dissolving pulp and at the same time, to decrease the intrinsic viscosity. This allowed to prepare viscose with 40 % less of carbon disulfide, and to eliminate the aging stage in order to simplify the process and with the combination of both possibilities, obtaining viscose with similar characteristics to the reference one. As an alternative to the viscose process, the direct dissolution of cellulose in sodium hydroxide solutions with and without urea at low temperatures was studied. These solutions are interesting due to their lower cost and environmental impact. The rheological studies allowed to elucidate the behavior of the reference viscose solution and those prepared with the treated pulps, and the direct solutions in simple solvents. In this work it was tried not only to contribute innovative, economic and environment friendly dissolution means, but also to present new technological developments such as sponges and cellulose spheres.Palabras clave – provistas por el repositorio digital
Cellulose; Enzime; Viscose; Direct dissolution; Sponges; Spheres; Celulosa; Enzimas; Viscosa; Disolución directa; Esponjas; Esferas
Disponibilidad
| Institución detectada | Año de publicación | Navegá | Descargá | Solicitá |
|---|---|---|---|---|
| No requiere | 2016 | Biblioteca Virtual de la Universidad Nacional del Litoral (SNRD) |
|
Información
Tipo de recurso:
tesis
Idiomas de la publicación
- español castellano
País de edición
Argentina
Fecha de publicación
2016-12-07
