Aramid pulp treated with imidazolium ionic liquids as a filler in rigid polyurethane bio-foams |
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| Authors: | Eduardo Fischer Kerche Vinícius Demétrio da Silva Gabriela da Silveira Jankee Henri Stephan Schrekker Rafael de Avila Delucis Siva Irulappasamy Sandro Campos Amico |
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| Affiliation: | 1. Post graduate program in mining, metalurgical and materials (PPGE3M), Engineering School, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil;2. Institute of Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil;3. PPGCEM, Federal University of Pelotas, Pelotas, Brazil;4. Center for Composite Materials, Kalasalingam Academy of Research and Education, Anand Nagar, India |
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| Abstract: | 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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| Keywords: | composites foams ionic liquids polyurethane thermosets |
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