Wan Yi, He Jianghua, Zhang Yuetao, Chen Eugene Y-X
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China.
Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA.
Angew Chem Int Ed Engl. 2022 Feb 14;61(8):e202114946. doi: 10.1002/anie.202114946. Epub 2021 Dec 29.
This work utilizes frustrated Lewis pairs consisting of tethered bis-organophosphorus superbases and a bulky organoaluminum to furnish the highly efficient synthesis of well-defined triblock copolymers via one-step block copolymerization of lignin-based syringyl methacrylate and n-butyl acrylate, through di-initiation and compounded sequence control. The resulting thermoplastic elastomers (TPEs) exhibit microphase separation and much superior mechanical properties (elongation at break up to 2091 %, tensile strength up to 11.5 MPa, and elastic recovery up to 95 % after 10 cycles) to those of methyl methacrylate-based TPEs. More impressively, lignin-based tri-BCPs can maintain TPEs properties up to 180 °C, exhibit high transparency and nearly 100 % UV shield, suggesting potential applications in temperature-resistant and optical devices.
这项工作利用由连接的双有机磷超强碱和大位阻有机铝组成的受阻路易斯对，通过木质素基甲基丙烯酸丁香酯和丙烯酸正丁酯的一步嵌段共聚，经由双引发和复合序列控制，实现了结构明确的三嵌段共聚物的高效合成。所得的热塑性弹性体（TPE）表现出微相分离，并且与基于甲基丙烯酸甲酯的TPE相比，具有更优异的机械性能（断裂伸长率高达2091%，拉伸强度高达11.5MPa，10次循环后弹性回复率高达95%）。更令人印象深刻的是，基于木质素的三嵌段共聚物在高达180°C的温度下仍能保持TPE的性能，具有高透明度和近100%的紫外线屏蔽率，表明其在耐高温和光学器件方面具有潜在应用。
