比利时鲁汶大学(法语)Evelyne Van Ruymbeke 教授:Viscoelastic properties of associating polymers: When several dynamics are coming into play
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比利时鲁汶大学(法语)Evelyne Van Ruymbeke 教授:Viscoelastic properties of associating polymers: When several dynamics are coming into play
发布时间:2025-05-20        浏览次数:10

报告题目:Viscoelastic properties of associating polymers: When several dynamics are coming into play

报告人:Evelyne Van Ruymbeke 教授(比利时鲁汶大学(法语))

报告时间:2025年5月30日(星期五)上午10:00-11:30

报告地址:五山科技园2号楼324报告厅

报告邀请人:张荣纯教授

邀请单位:前沿软物质学院 

报告摘要

Understanding and tailoring the viscoelastic response of polymer melts or concentrated solutions from the knowledge of their molecular structure (architecture) represents a formidable challenge and remains an important field of soft matter research. In order to further study the dynamics of these samples, we have developed a general coarse-grained approach based on the tube model, that we are now using as a tool to investigate the viscoelastic properties of complex, entangled polymer architectures.

In the present work, we extend this approach to investigate the dynamics of reversible polymer networks, containing supramolecular junctions. The combination of stickers, exchangeable bonds and entanglements as topological constraints provides a large room to modulate the viscoelastic response of the networks. On one hand, the network elasticity depends on the density of the reversible junctions but also on the entanglements trapped within the network, the proportion of which depends on the topology of the building blocks. On the other hand, the relaxation time of the network depends on the cooperative effects of the stickers, dangling ends and entanglements, their corresponding lifetimes being a function of the sample composition.

 Considering these different mechanisms, we show that it is possible to design very different transient networks but with exactly the same linear viscoelastic response at a specific temperature. But interestingly, these networks do not behave similarly at another temperature or under large deformation. This opens new possibilities to further control the networks dynamics, towards the design of samples with desired properties.

报告人简介

Since 2012, Prof. Evelyne van Ruymbeke is Senior Research Associate of the FNRS and Professor at UCL working at the Institute of Condensed Matter and Nanosciences, after two years as scientist in the Polymer Rheology and Processing Research department at DSM (Geleen, The Netherlands), and a three years postdoctoral stay with Prof. Dimitris Vlassopoulos at the Foundation for Research and Technology Hellas (Heraklion, Greece)  .  

The overall objective of her research is to understand and model at the mesoscopic level the relationship between the composition of polymeric samples and their rheological behavior. Her interests include the study of the properties of supramolecular polymer networks and the study of the nonlinear viscoelastic properties of polymer melts and solutions under shear or elongation.

She is presently coordinator of the European MSCA doctoral Network ‘ReBond’, which aims at using vitrimers for enhancing the properties of plastic waste. 

In 2011 and in 2018, she received the Journal of Rheology Publication Award of the Society of Rheology, and in 2016, she received the Arthur B. Metzner Early Career Award of the Society of Rheology. She is presently member at large of the Society of Rheology and Associated Editor of Macromolecules.


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