Sequential curing of thiol-acetoacetate-acrylate thermosets by latent Michael addition reactions

POLYMER

卷:113

Article

Osman Konuray, Ali¹  Liendo, Freddy¹  Fernandez-Francos, Xavier¹  Serra, Angels²  Sangermano, Marco³  Ramis, Xavier¹ 

[1] Univ Politecn Cataluna, ETSEIB, Thermodynam Lab, Av Diagonal 647, E-08028 Barcelona, Spain

[2] Univ Rovira & Virgili, Dept Analyt & Organ Chem, C Marcel li Domingo S-N, E-43007 Tarragona, Spain

[3] Politecn Torino, Dept Mat Sci & Chem Engn, C So Duca Abruzzi 24, I-10129 Turin, Italy

关键词: Michael addition;    Acetoacetate;    Acrylate;    Thermosets;    Photobase;   

DOI  :  10.1016/j.polymer.2017.02.072

来源: Elsevier

【 摘 要 】

Thiol-acetoacetate-acrylate ternary dual-curing thermosets were prepared by a sequential process consisting of thiol-Michael addition to acrylates at room temperature followed by Michael addition of acetoacetates to acrylates at moderately elevated temperature. The curing sequence can be controlled with the help of the different acidities of the protons on thiol and acetoacetate groups, the favorable pKa of the base used as catalyst and the self-limiting character of Michael additions. The latency of the curing steps can be regulated by selection of the right catalysts, temperature and curing conditions. The properties of the intermediate and final materials can be tuned by changing the structure of the monomers and the contribution of both Michael addition reactions. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free