Aramid pulp treated with imidazolium ionic liquids as a filler in rigid polyurethane bio‐foams

• Autor(a) principal: Kerche, Eduardo Fischer
• Data de Publicação: 2021
• Outros Autores: Silva, Vinícius Demétrio da, Jankee, Gabriela da Silveira, Schrekker, Henri Stephan, Delucis, Rafael de Ávila, Siva, Irulappasamy, Amico, Sandro Campos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/220422
• topic: Fibras de aramida; Líquidos iônicos; Espuma de poliuretano; Composites; Foams; Ionic liquids; Polyurethane; Thermosets

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.