Waterborne Methacrylate-Based Vitrimers,ACS Macro Letters

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Waterborne Methacrylate-Based Vitrimers
ACS Macro Letters ( IF 5.1 ) Pub Date : 2019-12-27 , DOI: 10.1021/acsmacrolett.9b00997
Francisco Lossada _{1,

2,

3} , Dejin Jiao _{1,

2,

3} , Xuyang Yao _{1,

2,

3,

4} , Andreas Walther _{1,

2,

3,

4,

5}

Affiliation

We demonstrate waterborne, unimolecularly dissolved vitrimer prepolymer systems that can be transferred into a vitrimer material using catalytic transesterification. The one-component prepolymer system can be processed via film casting and subsequent heat-induced cross-linking. A variation of the density of side chain hydroxy groups over ester and amide groups in the methacrylate/methacrylamide backbone, as well as of the Lewis acid catalyst loading, allow control of the extent of cross-linking and exchange rates. The increase of the amount of both catalyst and hydroxy groups leads to an acceleration of the relaxation times and a decrease of the activation energy of the transesterification reactions. The system features elastomeric properties, and the tensile properties are maintained after two recycling steps. Thus far, vitrimers have been limited largely to hydrophobic polymers; this system is a step forward toward waterborne, one-component materials, and we demonstrate its use in waterborne bioinspired nanocomposites.

中文翻译：

水性甲基丙烯酸酯基 Vitrimers

我们展示了水性、单分子溶解的 vitrimer 预聚物系统，可以使用催化酯交换转移到 vitrimer 材料中。单组分预聚物体系可以通过薄膜流延和随后的热诱导交联进行加工。甲基丙烯酸酯/甲基丙烯酰胺主链中侧链羟基相对于酯和酰胺基团的密度的变化，以及路易斯酸催化剂负载的变化，可以控制交联程度和交换速率。催化剂和羟基量的增加导致弛豫时间的加速和酯交换反应的活化能的降低。该系统具有弹性特性，并且在两个回收步骤后保持拉伸特性。迄今，玻璃体主要限于疏水聚合物；该系统是朝着水性单组分材料迈出的一步，我们展示了它在水性仿生纳米复合材料中的应用。

更新日期：2019-12-29

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