首页|Linear Viscoelasticity of ABA-type Vitrimer Based on Dioxaborolane Metathesis
Linear Viscoelasticity of ABA-type Vitrimer Based on Dioxaborolane Metathesis
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
维普
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 ex-cess 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 difference to the distinct relaxation mechanisms:the relaxation of the vitrimer samples is based on relatively in-dependent 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.
Polymer rheologyLinear viscoelasticityABA-type vitrimerRelaxation mechanismKinetics and thermodynamics
Shi-Long Wu、Huan-Huan Yang、Quan Chen
展开 >
State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Science,Changchun 130022,China
University of Science and Technology of China,Hefei230026,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
万方数据
维普
