Resende Gabriel, Azevedo Gustavo D, Souto Felipe, Calado Veronica
Programa de Engenharia de Processos Químicos e Bioquímicos, Escola de Química, Centro de Tecnologia, Universidade Federal Do Rio de Janeiro, Av. Athos da Silveira Ramos, 149, Bloco E, Ilha do Fundão, Rio de Janeiro 21941-909, Brasil.
ACS Omega. 2024 Dec 19;9(52):50945-50956. doi: 10.1021/acsomega.4c03127. eCollection 2024 Dec 31.
This work explored the chemical modification of lignin with succinic acid for the first time. Temperature is crucial for the process, reducing reaction time and increasing conversion. In particular, at 160 °C for five h with 0.13 mol of imidazole and 0.35 mol of succinic acid, the reaction showed the most significant reduction in glass transition temperature (from 183.3 to 118.5 °C) and a decrease in the polydispersity index (from 11.31 to 8.96) and yielded 0.73 mmol g of new succinic acid groups. These results underscore the critical role of reaction conditions in modifying lignin properties, potentially expanding its application range and enhancing its value.
这项工作首次探索了用琥珀酸对木质素进行化学改性。温度对该过程至关重要，它能缩短反应时间并提高转化率。特别是在160°C下反应5小时，使用0.13摩尔咪唑和0.35摩尔琥珀酸时，反应显示出玻璃化转变温度显著降低（从183.3°C降至118.5°C），多分散指数下降（从11.31降至8.96），并产生了0.73毫摩尔/克的新琥珀酸基团。这些结果强调了反应条件在改变木质素性质方面的关键作用，可能会扩大其应用范围并提高其价值。
