Extremely Stretchable Vitrimers. Issue 16 (21st July 2020)

• Record Type: Journal Article
• Authors: Lyu, Zhenyu; Wu, Tongfei
• Is Part Of: Macromolecular rapid communications. Volume 41:Issue 16(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-07-21
• Subjects: covalent adaptable networks -- energy dissipation -- self‐healing -- superstretchability -- vitrimers; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.202000265
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract: Vitrimers are covalent adaptable networks, having many interesting versatile abilities with unprecedented potentials. Here, the combination of a low‐ T g polymer system with dioxaborolane metathesis is used to develop catalyst‐free vitrimers that can be stretched to more than 8900× their original length at a moderate stretching rate (≈50 mm min −1 ). Superstretchable vitrimers are prepared from biodegradable xylitol‐based polyol oligomers and cross‐linked by dioxaborolane linkages. They are also found to be remarkable in terms of mechanical strength and other properties, such as malleability, self‐healing ability, puncture resistance, and processing stability. Furthermore, the repeated rearrangements of dioxaborolane linkages and hydrogen bonds give rise to efficient energy dissipation with a maximum efficiency of 88%, allowing the superstretchable vitrimers to be promising for energy absorbing applications. Abstract : Vitrimers are one of the versatile covalent adaptable networks (CANs), having many interesting abilities with unprecedented potentials. Catalyst‐free vitrimers, prepared from a low‐ T g amorphous polymeric system cross‐linked by exchangeable dioxaborolane linkages, demonstrate extremely high stretchability at moderate stretching rates (≈50 mm min −1 ) and other remarkable properties, e.g., self‐healing, processing stability, and energy absorbing.