Wu, S. L.; Yang, H. H.; Chen, Q. Linear viscoelasticity of ABA-type vitrimer based on dioxaborolane metathesis. Chinese J. Polym. Sci. 2024, 42, 1495–1504
Shi-Long Wu, Huan-Huan Yang, Quan Chen. Linear Viscoelasticity of ABA-type Vitrimer Based on Dioxaborolane Metathesis[J]. Chinese Journal of Polymer Science, 2024, 42(10): 1495-1504.
Wu, S. L.; Yang, H. H.; Chen, Q. Linear viscoelasticity of ABA-type vitrimer based on dioxaborolane metathesis. Chinese J. Polym. Sci. 2024, 42, 1495–1504DOI: 10.1007/s10118-024-3184-7.
Shi-Long Wu, Huan-Huan Yang, Quan Chen. Linear Viscoelasticity of ABA-type Vitrimer Based on Dioxaborolane Metathesis[J]. Chinese Journal of Polymer Science, 2024, 42(10): 1495-1504.DOI: 10.1007/s10118-024-3184-7.
Linear Viscoelasticity of ABA-type Vitrimer Based on Dioxaborolane Metathesis
We developed a series of ABA-type vitrimers and systematically examined the viscoelastic properties as functions of the length of A moieties and the crosslinker content. We discussed the distinct relaxation mechanisms for vitrimer based on associative exchange reaction and ionomers based on ionic attraction.
Abstract
In this study
we synthesized a series of ABA-type vitrimers by crosslinking the short A moieties of precursors with a bifunctional crosslinker and evaporating the small molecular byproduct. The vitrimer samples thus prepared exhibit linear viscoelasticity dependent on the length of A moiety as well as the content of the crosslinks. When the average number of A monomers per end moiety
m
=1.1
the crosslinker can only extend the chain but not crosslink the chain. When
m
becomes 2.8 or higher
introducing a crosslinker first leads to the gelation
whereas excess in crosslinker molecules leads opening of the crosslinking sites and accordingly reentry into the sol regime. Surprisingly
a further increase in the length of the A moieties increases the relaxation time much weaker than the exponential increase seen for the physically crosslinked ABA-type ionomers. We attribute this differenc
e to the distinct relaxation mechanisms: the relaxation of the vitrimer samples is based on relatively independent exchange reactions
which contrasts with the ABA-type ionomers that relax through the collective hopping of connected ionic groups from one ion aggregate to another.
关键词
Keywords
references
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