Affiliation:
1. Department of Polymer Materials Science Engineering South China University of Technology Guangzhou China
2. Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou China
Abstract
AbstractIn this study, flame retarded polyurethane vitrimers, namely vitrimeric poly(isocyanurate urethane)s (VPICUs), were synthesized successfully by melting polycondensation simply from tris(2‐hydroxyethyl)isocyanurate and dicarbamates. By increasing the methylene number in dicarbamates from 4 to 10, the VPICUs exhibit superior mechanical performance with elongation at break increases from 20% to 350% while the tensile strength decreases from 80 to 32 MPa, and the toughness can be significantly enhanced from 9 to 90 J/cm3. With a mass fraction of isocyanurate ring at 26.6%, for VPICU10‐2.5/2, the flame retardancy is found to be the most excellent, with a UL‐94 rating at V‐0 and a LOI value at 25.9%. VPICU10 samples exhibit substantial relaxation behavior at higher temperature, and the network rearrangement activated by transesterification and transurethanization reactions offers the reprocessability without losing the properties. This work provides new insights into the construction of sustainable and high‐performance flame retarded polymer materials.
Funder
National Natural Science Foundation of China
South China University of Technology
Cited by
1 articles.
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