Imaging Science and Photochemistry ›› 2020, Vol. 38 ›› Issue (1): 27-36.DOI: 10.7517/issn.1674-0475.190801

• Review and Articles • Previous Articles     Next Articles

Study on Synthesis and Properties of an Amidine-based Photobase Generator Sensitive to LED Light

ZHENG Yuanjian1,2, YANG Yi'nan2, LU Huaqiao2, LIU Ren1,2, LI Zhiquan1,2   

  1. 1. International Research Center for Photoresponsive Molecules and Materials, Jiangnan University, Wuxi 214122, Jiangsu, P. R. China;
    2. School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu, P. R. China
  • Received:2019-08-08 Online:2020-01-15 Published:2020-01-15

Abstract: As a key component of photocuring system, a photobase generator has an important influence on the photocuring rate and properties of the cured materials. In this paper, a novel unimolecular amidine-based photobase generator, containing a xanthone as a chromophore and DBN as a latent active base functionality, was designed and synthesized. The photophysical and photochemical 27 behaviors were systematically investigated. The results show that the synthesized photobase generator has strong absorption at 345 nm, and the DBN released after photolysis can effectively catalyze the polymerization of thiol-epoxy system. Compared with the commercial latent benzyl amidine photobase generator, the introduced xanthone chromophore makes the absorption wavelength red shift, matching with the 365 nm LED light. Compared with the ionic thioxantone-based photobase generator, the nonionic photobase generator does not produce CO2 after photolysis, which offer it great potentials for various applications.

Key words: photobase generator, amidine, xanthone, thiol-epoxy