Establishment of the synthesis route of furfuryl resin in acidic medium to minimize the exothermy of reaction

Materia

article

Maria Claudia Ribeiro Coimbra¹  Tayra Rodrigues Brazil¹  Guilherme Ferreira de Melo Morgado¹  Eduardo Ferreira Martins¹  Erick Gabriel Ribeiro dos Anjos¹  Isabela Monteiro Cesar Oyama¹  Jéssica de Souza Rodrigues²  Vagner Roberto Botaro²  Larissa Stieven Montagna¹  Mirabel Cerqueira Rezende¹ 

[1] Universidade Federal de São Paulo;Universidade Federal de São Carlos

关键词: Synthesis;    Furfuryl alcohol;    Furfuryl resin;   

DOI  :  10.1590/1517-7076-RMAT-2022-0054

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

Poly(furfuryl alcohol) (PFA) is a bioresin obtained from furfuryl alcohol (FA) extracted from renewable sources. This resin, when cured, has excellent characteristics, such as high hardness, chemical stability, and good mechanical resistance, which make its use in different areas viable, especially in the aerospace and bioengineering sectors. However, its use on a large scale is still limited due to the difficult control of its synthesis process since the polycondensation reaction of FA is extremely exothermic. The present work aims to contribute to the area of PFA synthesis, through the study of its obtainment in acidic medium and at low temperature (∼50 ºC), varying the reaction times (1, 2, and 3 h), aiming at greater control of the exothermy of the reaction medium. Fourier transform infrared spectroscopy analyses confirmed the syntheses success, which showed the presence of ketones and structures according to Diels-Alder and the Dunlop and Peters. Viscosity measurements showed low values (230 to 470 mPa.s), which are in agreement with the low molar masses obtained by gel permeation chromatography (M¯w: ∼800 g/mol). These results show that the synthesis conditions used kinetically unfavored the progress of the reaction but avoided exothermic peaks. Thermogravimetric analysis (TGA) of the PFAs cured with p-toluenesulfonic acid (2 and 3%, w/w) showed mass losses since the beginning of the analysis due to the presence of water and low molar mass fractions in the sample. These data agree with the images obtained by scanning electron microscopy, which showed a high volume of pores. Relevant results were observed in the TGA analysis under an inert atmosphere, with high values of carbon yield (50–60%), indicating the potential use of synthesized PFAs in the area of carbon materials.

【 授权许可】

CC BY