期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 1, 页码 376-381出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b01756
关键词
Castor oil; Biothiol; Thiol-ene photoclick reaction; Self-initiated; Photoinitiator-free UV coating
资金
- National Natural Science Foundation of China [21404042]
- Guangdong Provincial Science and Technology Project [2013B010101007]
- International Postdoctoral Exchange Fellowship Program [[2014] 29]
- Science and Technology Program of Guangzhou [201607020045]
- Fundamental Research Funds for the Central Universities [2016ZM060]
In this paper, we reported castor oil based biothiol (CO-SH) as a highly stable and self-initiated oligomer for photoinitiator (PO-free UV coating. CO-SH was synthesized via esterification reaction between castor oil (CO) and 3-mercaptopropionic acid (MPA). The results of both proton nuclear magnetic resonance (H-1 NMR) and Fourier transform infrared spectroscopy (FTIR) revealed that the targeted oligomer was successfully prepared. The oligomer with the number-average molecular weight of 2040 g mol(-1) exhibited a narrow molecular weight distribution (PDI = 1.23). CO-SH could be stored at 80 degrees C for 7 days with only a light C=C conversion (approximate to 6%); hence, the steric effect of the vegetable oil molecule gave the primary biothiol an excellent temporal stability. Furthermore, real-time FTIR results indicated that excellent photopolymerization profiles were obtained, and the final conversions of double bond and thiol were 100% and 77% in the absence of PI, respectively, showing the rapid self-initiated photoactivity. In addition, the self-initiated photopolymerization mechanism of CO-SH was investigated. Finally, the UV-curable films of CO-SH also showed good physical and chemical properties.
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