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09-03-2021 | Original Research

Micro fibrillated cellulose reinforced bio-based rigid high-density polyurethane foams

Authors: Eduardo Fischer Kerche, Dyones Natan Bock, Rafael de Avila Delucis, Washington Luiz Esteves Magalhães, Sandro Campos Amico

Published in: Cellulose | Issue 7/2021

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Abstract

Rigid polyurethane foams (RPUF) are the most consumed cellular polymer in the world. Bio-based 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.

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Title: Micro fibrillated cellulose reinforced bio-based rigid high-density polyurethane foams
Authors: Eduardo Fischer Kerche
Dyones Natan Bock
Rafael de Avila Delucis
Washington Luiz Esteves Magalhães
Sandro Campos Amico
Publication date: 09-03-2021
Publisher: Springer Netherlands
Published in: Cellulose / Issue 7/2021
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-021-03801-1

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