The role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites

Nanocrystalline cellulose (CNC), obtained by sulphuric acid hydrolysis, was used to synthesize polyurethane foams (PUFs) based on a functionalized castor oil polyol and a Methylene diphenyl diiso- cyanate (MDI). Formulations with varying isocyanate index (FI) and NCO number were prepared. At 0.5 wt....

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Autores principales: Cordero, Andrés Ignacio, Amalvy, Javier, Fortunati, Elena, Kenny, José María, Chiacchiarelli, Leonel Matías
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2019
Materias:
Polyurethane foams, Castor oil polyol, Nanocrystalline cellulose, Mechanical properties, Thermal properties
Acceso en línea:http://hdl.handle.net/20.500.12272/3412
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-3412
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Inglés
topic Polyurethane foams, Castor oil polyol, Nanocrystalline cellulose, Mechanical properties, Thermal properties
spellingShingle Polyurethane foams, Castor oil polyol, Nanocrystalline cellulose, Mechanical properties, Thermal properties
Cordero, Andrés Ignacio
Amalvy, Javier
Fortunati, Elena
Kenny, José María
Chiacchiarelli, Leonel Matías
The role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites
topic_facet Polyurethane foams, Castor oil polyol, Nanocrystalline cellulose, Mechanical properties, Thermal properties
description Nanocrystalline cellulose (CNC), obtained by sulphuric acid hydrolysis, was used to synthesize polyurethane foams (PUFs) based on a functionalized castor oil polyol and a Methylene diphenyl diiso- cyanate (MDI). Formulations with varying isocyanate index (FI) and NCO number were prepared. At 0.5 wt.%, SEM’s of the fractured surface underlined that the CNC acted both as a nucleation agent and as a particulate surfactant with cell geometries and apparent density changing selectively. The chemical structure of the PUF (FTIR) changed after the incorporation of CNC by a relative change of the amount of urea, urethane and isocyanurate groups. A low NCO number and isocyanate index contributed to the migration of the CNC to the Hard Segment (HS), acting as reinforcement and improving substantially the compressive mechanical properties (Ec and �����c improvements of 63 and 50%, respectively). For a high NCO number or isocyanate index, the CNC migrated to the Soft Segment (SS), without causing a reinforcement effect. The migration of the CNC was also detected with DSC, TGA and DMA, furtherly supporting the hypothesis that a low NCO number and index contributed both to the formation of a microstructure with a higher content of urethane groups.
format Artículo
publishedVersion
Artículo
author Cordero, Andrés Ignacio
Amalvy, Javier
Fortunati, Elena
Kenny, José María
Chiacchiarelli, Leonel Matías
author_facet Cordero, Andrés Ignacio
Amalvy, Javier
Fortunati, Elena
Kenny, José María
Chiacchiarelli, Leonel Matías
author_sort Cordero, Andrés Ignacio
title The role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites
title_short The role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites
title_full The role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites
title_fullStr The role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites
title_full_unstemmed The role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites
title_sort role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites
publishDate 2019
url http://hdl.handle.net/20.500.12272/3412
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