Fast processing of highly crosslinked, low-viscosity vitrimers†,Materials Horizons

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Fast processing of highly crosslinked, low-viscosity vitrimers†
Materials Horizons ( IF 12.2 ) Pub Date : 2019-08-23 , DOI: 10.1039/c9mh01062a
Christian Taplan _{1,

2,

3,

4,

5} , Marc Guerre _{1,

2,

3,

4,

5} , Johan M. Winne _{1,

2,

3,

4,

5} , Filip E. Du Prez _{1,

2,

3,

4,

5}

Affiliation

Here we describe a rational approach to go beyond the current processability limits of vitrimer materials, with a demonstration of low-viscosity fast processing of highly crosslinked permanent networks. Vitrimers are a recently introduced class of polymer networks with a unique glass-like viscoelastic behavior, in which bond exchange reactions govern the macroscopic material flow. The restricted chain mobility, only enabled by chemical exchanges, typically limits the use of continuous processing techniques, such as extrusion or injection moulding. Herein, we outline a straightforward materials design approach, taking into account both the effect of minor additives on the chemistry of bond rearrangement as well as the macromolecular architecture of the vitrimeric network. These combined effects are demonstrated to work in an additive fashion, culminating in stress relaxation times below 1 s at 150 °C. The observed rapid bond exchanges in permanent networks result in an unprecedented control of the polymer material behavior, where the material flow is still dominated by chemical exchanges, but only marginally limited by the chemical exchange rate, overcoming the challenges encountered so far in continuous processing of highly crosslinked vitrimeric systems.

中文翻译：

快速加工高度交联的低粘度微晶†

在这里，我们描述了一种合理的方法，该方法超越了目前的三聚体材料加工性能极限，并展示了高交联的永久性网络的低粘度快速加工。Vitrimers是最近引入的一类聚合物网络，具有独特的类似于玻璃的粘弹性行为，其中键交换反应控制宏观的材料流动。仅通过化学交换才能实现的受限制的链移动性通常限制了连续加工技术的使用，例如挤出或注塑。在这里，我们概述了一种简单的材料设计方法，同时考虑了微量添加剂对键重排化学的影响以及玻璃体网络的大分子结构。这些综合效果已证明可以相加的方式发挥作用，最终在150°C下应力松弛时间低于1 s。在永久性网络中观察到的快速键交换导致对聚合物材料行为的空前控制，其中材料流仍由化学交换控制，但仅受到化学交换速率的有限限制，克服了迄今为止在连续加工中遇到的挑战。高度交联的三聚体系统。

更新日期：2020-01-04

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