Park, Bumsoo Chae, Yunmi Noh, Guk-Yun Choi, Yong-Seok Lee, Woohwa Kim, Hyun Chae, Chang-Geun Ryu, Du Yeol Kim, Dong-Gyun Kim, Yong Seok Park, Sungmin 2024-10-26T15:30:13Z 2024-10-26T15:30:13Z 2024-10-25 2024-12 https://pubs.kist.re.kr/handle/201004/150884 Interest in vitrimers has increased due to the growing importance of recyclable thermosets. Controlling the flow properties of vitrimers to enhance creep resistance and processability presents challenges, particularly in extending the operating temperature range. Herein, a facile approach using a dual-catalytic system with varied activation energies (Ea) was applied to control the creep and flow properties of vitrimers. We employed an asymmetric dual-catalytic system, where a catalyst with a lower Ea facilitated the formation of a highly crosslinked structure, ensuring high creep resistance at low temperatures, while a catalyst with a higher Ea increased the deformation rate at elevated temperatures. The temperature range with distinct stress-relaxation behaviors were observed when the proper asymmetric dual-catalytic system was applied, where creep was effectively suppressed at lower temperatures, and a dormant catalyst with a higher Ea significantly accelerated the exchange reaction upon activation at higher temperatures. These findings and characterization offer valuable insights into the potential for vitrimer properties control, and vitrimer recycling using diverse catalytic systems. English Elsevier BV Controlled creep resistance and melt-flow properties of vitrimers in a facile dual-catalytic system Article 10.1016/j.mtcomm.2024.110595 1 Materials Today Communications, v.41 Materials Today Communications 41 N scie scopus 001332744300001 2-s2.0-85205342424 Materials Science, Multidisciplinary Materials Science Article POLYMER NETWORKS TRANSESTERIFICATION TEMPERATURE RELAXATION TRANSITION DYNAMICS Vitrimers Dual-catalytic system Creep resistance Melt flow properties Vitrimer characterizations