Research on Metal-ligand Mechanism and Mechanical Properties of Zn2+-UV Precuring Acrylate Elastomer
In order to improve the strength and deformation of acrylate elastomer simultaneously,the liquid acrylate resin with different viscosities was prepared through the UV precuring process,then benzoyl peroxide(BPO)and N,N-dimethylaniline(DMA)were used as the curing system,which provided N,O atom coordinating with Zn2+,so that the interaction between molecular chains was increased to enhance the mechanical properties of the elastomer.In the curing process,resin turned from light yellow to purple,and became green eventually after curing completely.The causes of the color change and the mechanism of Zn2+with the molecular chain of polymer were revealed:when N,O atoms provided by BPO and DMA,respectively,with free radicals coordinated with Zn2+,the system became purple;the system turned green when the free radicals faded away completely.According to the coordination mechanism,metal coordination bonds generated between Zn2+and the molecular chains were located at the end of the chain,which greatly increased the elongation at break of the elastomer,so that the elongation at break of Zn2+-acrylate elastomer increased to 7400％from 630％.Because of characteristics of the metal coordination bonds,we found that appropriate heat treatment can adjust the number of coordination bonds.After 150 ℃ treatment,the tensile strength and the elongation at break of Zn2+-acrylate elastomer increased by 28.6％and 39.6％,respectively,compared to those of the pure acrylate elastomer.In other words,both the tensile strength and elongation at break of Zn2+-acrylate elastomer increased.This study provides a strategy for metal coordination with acrylate polymer,which is expected to play a significant role in the research of high elongation acrylate elastomer.The elastomer prepared can be used as seals,flexible sensor substrates in scenarios requiring the high extension rate materials.
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