Tan-delta plateau in vitrimer-like polyurethanes

• Main Authors: Wang, Tao Xi, Chen, Hong Mei, Li, Tong, Ng, Lucas Boon Siang, Xie, Hui, Xiao, Rui, Huang, Wei Min
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Mechanical engineering; Vitrimer-Like; Tan Delta
• Online Access: https://hdl.handle.net/10356/163069
• Institution: Nanyang Technological University

A vitrimer-like polyurethane is investigated for its Tan-delta plateau phenomenon (i.e., a quasi-steady high Tan-delta value over a long temperature range). It is concluded that this plateau is associated with cross-linking dissociation, but on the condition that this dissociation process should be over a long temperature range and right after a melting transition. While this plateau is rather stable at different oscillation strains and frequencies, the time–temperature equivalence of the dissociation process is confirmed to be applicable to this material.