Data/hora: 17/06/2024 12:39:09

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 13/07/2021
Data da última atualização: | 14/07/2021
Autoria: | KERCHE, E. F.; BOCK, D. N.; DELUCIS, R. de A.; MAGALHAES, W. L. E.; AMICO, S. C.
Afiliação: | EDUARDO FISCHER KERCHE, Programa de Pós-Graduação da UFRGS; DYONES NATAN BOCK, Programa de Pós-Graduação da UFRGS; RAFAEL DE AVILA DELUCIS, UFRGS; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; SANDRO CAMPOS AMICO, Programa de Pós-Graduação da UFRGS.
Título: | Micro fibrillated cellulose reinforced bio-based rigid high-density polyurethane foams.
Ano de publicação: | 2021
Fonte/Imprenta: | Cellulose, v. 28, n. 7, p. 4313-4326, May 2021.
DOI: | https://doi.org/10.1007/s10570-021-03801-1
Idioma: | Inglês
Conteúdo: | Rigid polyurethane foams (RPUF) are the most consumed cellular polymer in the world. Biobased polyols are sometimes used as raw material for RPUF but with a detrimental effect on mechanical properties. In this paper, micro fibrillated cellulose (MFC) was used as a reinforcement to enhance the mechanical, thermal and dynamic mechanical properties of bio-based RPUF. A bleached Eucalyptus sp. pulp was dispersed in glycerine and then subjected to mechanical defibrillation to extract the MFC, a route that does not require dispersants or drying, which is advantageous for the MCF incorporation. The RPUF were manufactured in a closed mould in a way to obtain overpacking. The higher the overpacking degree, the higher the apparent density and stiffness of the RPUF. Also, expansion under confinement yielded more rounded polymer cells with decreased anisotropy. The MFC and overpacking acted synergistically, improving strength, stiffness, thermal stability and dynamic mechanical properties of the RPUF. Thermal conductivity of the RPUF, on the other hand, was unaffected by those factors.
Palavras-Chave: | Bio-based polyols; Cellular composite; Celulose nanofibrilada; Micro fibrillated cellulose; Nanocompósito; Poliuretana reforçada; Rigid polyurethane foam; Thermoset polymers.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (57781-1) - UPC - AP - DD -  -  -  - DIS