Aramid pulp treated with imidazolium ionic liquids as a filler in rigid polyurethane bio‐foams
This article reports an aramid pulp (AP) treated with two ionic liquids (IL), namely 1‐n‐butyl‐3‐methylimidazolium chloride (C4.Cl) and 1‐carboxymethyl‐3‐methylimidazolium chloride (HO2C), and its use as a filler in reinforced rigid polyurethane foams (RPUF). The RPUF were incorporated with the trea...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/220422 |
| Acceso en línea: | http://hdl.handle.net/10183/220422 |
| Access Level: | acceso abierto |
| Palabra clave: | Fibras de aramida Líquidos iônicos Espuma de poliuretano Composites Foams Ionic liquids Polyurethane Thermosets |
| Sumario: | This article reports an aramid pulp (AP) treated with two ionic liquids (IL), namely 1‐n‐butyl‐3‐methylimidazolium chloride (C4.Cl) and 1‐carboxymethyl‐3‐methylimidazolium chloride (HO2C), and its use as a filler in reinforced rigid polyurethane foams (RPUF). The RPUF were incorporated with the treated AP at three weight fractions (c.a. 0.1, 0.5, and 1.0 wt%) and were produced by the free rising method. The results showed that the studied IL promoted a better interaction between the AP and the RPUF system, which increased the overall reactivity, imparting a higher cell anisotropy. This also yielded a positive effect in mechanical properties and thermal stability of the RPUF. Compared to the neat RPUF, outstanding increases of approximately 50 and 20% were achieved in compressive modulus and strength, respectively. In all, the use of IL promoted increased compatibility between matrix and reinforcement, especially that HO2C IL. |
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