Research on biobased degradable flexible polymers with high transparency and outstanding mechanical performance is of great importance for the rapid and sustainable development of flexible devices. Herein, renewable vanillin was chosen to synthesize a biobased allyl ether monomer (BAMTU) with high aromaticity and degradable acetal groups. BAMTU and thiol with different functionalities were then polymerized through thiol–ene “click” photopolymerization to form three kinds of thiol–ene networks (BAMTU-SH) with tunable properties. Their glass transition temperatures ranged from 20 to 49 °C, their tensile strength and elongation at break were 2.9–18.2 MPa and 103.5–305.6%, respectively. BAMTU-SH4 showed the best integrated mechanical performance, for which the toughness was the highest (14.5 MPa). These BAMTU-SH networks exhibited high transparency with a transmittance of 89.4–90.5% at 550 nm. Moreover, all of them could be degraded in mild acetic acid solution. The high-performance BAMTU-SH networks have potential applications in flexible device substrates while their degradability will contribute to environmental protection.

中文翻译：

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通过香草醛通过硫醇-烯“点击”光聚合反应构建生物基，​​可降解，灵活的聚合物网络

具有高透明度和出色机械性能的生物基可降解柔性聚合物的研究对于柔性设备的快速和可持续发展具有重要意义。本文中，选择可再生香兰素来合成具有高芳香性和可降解缩醛基团的生物基烯丙基醚单体（BAMTU）。然后通过硫醇-烯“点击”光聚合将具有不同功能的BAMTU和硫醇聚合，以形成具有可调特性的三种硫醇-烯网络（BAMTU-SH）。它们的玻璃化转变温度为20至49°C，抗张强度和断裂伸长率分别为2.9-18.2 MPa和103.5-305.6％。BAMTU-SH4表现出最佳的综合机械性能，其中韧性最高（14.5 MPa）。这些BAMTU-SH网络表现出很高的透明度，在550 nm处的透射率为89.4–90.5％。而且，它们都可以在温和的乙酸溶液中降解。高性能BAMTU-SH网络在柔性设备基板中具有潜在的应用，而它们的可降解性将有助于环境保护。