New allyl-functional catalytic comonomers for sequential thiol-Michael and radical thiol-ene reactions

POLYMER

卷:138

Article

Konuray, Osman¹  Fernandez-Francos, Xavier¹  Ramis, Xavier¹  Serra, Angels² 

[1] Univ Politecn Cataluna, Thermodynam Lab, ETSEIB, 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

关键词: Michael addition;    Dual-curing;    Thiol;    Acrylate;    Methacrylate;    Click reaction;   

DOI  :  10.1016/j.polymer.2018.01.073

来源: Elsevier

【 摘 要 】

Soft poly(thioether) thermosets have been synthesized by employing a two-step curing procedure based on click chemistry. The first stage of curing is a thiol-Michael addition between acrylates (or methacrylates) and thiols in excess, catalyzed by a set of novel tertiary amine catalyst comonomers with allyl functionality. Subsequently, the pendant allyl groups of the comonomer get incorporated into the polymer network by undergoing thiol-ene UV photopolymerization with the remaining thiols. The strong catalysis by the high concentration of tertiary amine groups facilitates quantitative conversions at the end of the first stage. All remaining functional groups are depleted after a short period of UV irradiation. Final materials are clear, transparent, and exhibit homogeneous network structures with alpha relaxation temperatures in the range 3-25 degrees C. This sub-ambient relaxation temperature range suggests these materials may be suitable for coating applications where delicate substrates are involved such as plastic, wood and paper. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free